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2020-01-28Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds1-5/+5
Pull scheduler updates from Ingo Molnar: "These were the main changes in this cycle: - More -rt motivated separation of CONFIG_PREEMPT and CONFIG_PREEMPTION. - Add more low level scheduling topology sanity checks and warnings to filter out nonsensical topologies that break scheduling. - Extend uclamp constraints to influence wakeup CPU placement - Make the RT scheduler more aware of asymmetric topologies and CPU capacities, via uclamp metrics, if CONFIG_UCLAMP_TASK=y - Make idle CPU selection more consistent - Various fixes, smaller cleanups, updates and enhancements - please see the git log for details" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (58 commits) sched/fair: Define sched_idle_cpu() only for SMP configurations sched/topology: Assert non-NUMA topology masks don't (partially) overlap idle: fix spelling mistake "iterrupts" -> "interrupts" sched/fair: Remove redundant call to cpufreq_update_util() sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled sched/fair: Fix sgc->{min,max}_capacity calculation for SD_OVERLAP sched/fair: calculate delta runnable load only when it's needed sched/cputime: move rq parameter in irqtime_account_process_tick stop_machine: Make stop_cpus() static sched/debug: Reset watchdog on all CPUs while processing sysrq-t sched/core: Fix size of rq::uclamp initialization sched/uclamp: Fix a bug in propagating uclamp value in new cgroups sched/fair: Load balance aggressively for SCHED_IDLE CPUs sched/fair : Improve update_sd_pick_busiest for spare capacity case watchdog: Remove soft_lockup_hrtimer_cnt and related code sched/rt: Make RT capacity-aware sched/fair: Make EAS wakeup placement consider uclamp restrictions sched/fair: Make task_fits_capacity() consider uclamp restrictions sched/uclamp: Rename uclamp_util_with() into uclamp_rq_util_with() sched/uclamp: Make uclamp util helpers use and return UL values ...
2020-01-27Merge tag 'ioremap-5.6' of git://git.infradead.org/users/hch/ioremapLinus Torvalds1-1/+1
Pull ioremap updates from Christoph Hellwig: "Remove the ioremap_nocache API (plus wrappers) that are always identical to ioremap" * tag 'ioremap-5.6' of git://git.infradead.org/users/hch/ioremap: remove ioremap_nocache and devm_ioremap_nocache MIPS: define ioremap_nocache to ioremap
2020-01-14Merge branch 'parisc-5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds1-2/+2
Pull parisc fixes from Helge Deller: "A boot crash fix by Mike Rapoport and a printk fix by Krzysztof Kozlowski" * 'parisc-5.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: fix map_pages() to actually populate upper directory parisc: Use proper printk format for resource_size_t
2020-01-14parisc: Use proper printk format for resource_size_tKrzysztof Kozlowski1-2/+2
resource_size_t should be printed with its own size-independent format to fix warnings when compiling on 64-bit platform (e.g. with COMPILE_TEST): arch/parisc/kernel/drivers.c: In function 'print_parisc_device': arch/parisc/kernel/drivers.c:892:9: warning: format '%p' expects argument of type 'void *', but argument 4 has type 'resource_size_t {aka unsigned int}' [-Wformat=] Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Helge Deller <deller@gmx.de>
2020-01-07parisc: Implement copy_thread_tlsAmanieu d'Antras1-4/+4
This is required for clone3 which passes the TLS value through a struct rather than a register. Signed-off-by: Amanieu d'Antras <amanieu@gmail.com> Cc: linux-parisc@vger.kernel.org Cc: <stable@vger.kernel.org> # 5.3.x Link: https://lore.kernel.org/r/20200102172413.654385-5-amanieu@gmail.com Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
2020-01-06remove ioremap_nocache and devm_ioremap_nocacheChristoph Hellwig1-1/+1
ioremap has provided non-cached semantics by default since the Linux 2.6 days, so remove the additional ioremap_nocache interface. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
2019-12-25Merge tag 'v5.5-rc3' into sched/core, to pick up fixesIngo Molnar5-11/+18
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-12-20parisc: soft_offline_page() now takes the pfnHelge Deller1-2/+1
Switch page deallocation table (pdt) driver to use pfn instead of a page pointer in soft_offline_page(). Fixes: feec24a6139d ("mm, soft-offline: convert parameter to pfn") Signed-off-by: Helge Deller <deller@gmx.de>
2019-12-15parisc: add missing __init annotationSven Schnelle1-1/+1
compilation failed with: MODPOST vmlinux.o WARNING: vmlinux.o(.text.unlikely+0xa0c): Section mismatch in reference from the function walk_lower_bus() to the function .init.text:walk_native_bus() The function walk_lower_bus() references the function __init walk_native_bus(). This is often because walk_lower_bus lacks a __init annotation or the annotation of walk_native_bus is wrong. FATAL: modpost: Section mismatches detected. Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them. make[2]: *** [/home/svens/linux/parisc-linux/src/scripts/Makefile.modpost:64: __modpost] Error 1 make[1]: *** [/home/svens/linux/parisc-linux/src/Makefile:1077: vmlinux] Error 2 make[1]: Leaving directory '/home/svens/linux/parisc-linux/build' make: *** [Makefile:179: sub-make] Error 2 Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-12-15parisc: fix compilation when KEXEC=n and KEXEC_FILE=ySven Schnelle1-1/+1
Fix compilation when the CONFIG_KEXEC_FILE=y and CONFIG_KEXEC=n. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-12-08sched/rt, parisc: Use CONFIG_PREEMPTIONThomas Gleixner1-5/+5
CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same functionality which today depends on CONFIG_PREEMPT. Switch the entry code over to use CONFIG_PREEMPTION. [bigeasy: +Kconfig] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Helge Deller <deller@gmx.de> Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-parisc@vger.kernel.org Link: https://lore.kernel.org/r/20191015191821.11479-16-bigeasy@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-12-04parisc: use pgtable-nopXd instead of 4level-fixupMike Rapoport2-7/+15
parisc has two or three levels of page tables and can use appropriate pgtable-nopXd and folding of the upper layers. Replace usage of include/asm-generic/4level-fixup.h and explicit definitions of __PAGETABLE_PxD_FOLDED in parisc with include/asm-generic/pgtable-nopmd.h for two-level configurations and with include/asm-generic/pgtable-nopud.h for three-lelve configurations and adjust page table manipulation macros and functions accordingly. Link: http://lkml.kernel.org/r/1572938135-31886-9-git-send-email-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Helge Deller <deller@gmx.de> Cc: Anatoly Pugachev <matorola@gmail.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Peter Rosin <peda@axentia.se> Cc: Richard Weinberger <richard@nod.at> Cc: Rolf Eike Beer <eike-kernel@sf-tec.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Sam Creasey <sammy@sammy.net> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-11-30Merge tag 'seccomp-v5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linuxLinus Torvalds1-1/+1
Pull seccomp updates from Kees Cook: "Mostly this is implementing the new flag SECCOMP_USER_NOTIF_FLAG_CONTINUE, but there are cleanups as well. - implement SECCOMP_USER_NOTIF_FLAG_CONTINUE (Christian Brauner) - fixes to selftests (Christian Brauner) - remove secure_computing() argument (Christian Brauner)" * tag 'seccomp-v5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: seccomp: rework define for SECCOMP_USER_NOTIF_FLAG_CONTINUE seccomp: fix SECCOMP_USER_NOTIF_FLAG_CONTINUE test seccomp: simplify secure_computing() seccomp: test SECCOMP_USER_NOTIF_FLAG_CONTINUE seccomp: add SECCOMP_USER_NOTIF_FLAG_CONTINUE seccomp: avoid overflow in implicit constant conversion
2019-11-30Merge branch 'parisc-5.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds1-1/+1
Pull parisc updates from Helge Deller: "Just trivial small updates: An assembler register optimization in the inlined networking checksum functions, a compiler warning fix and don't unneccesary print a runtime warning on machines which wouldn't be affected anyway" * 'parisc-5.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Avoid spurious inequivalent alias kernel error messages kexec: Fix pointer-to-int-cast warnings parisc: Do not hardcode registers in checksum functions
2019-11-28Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux; tag 'dma-mapping-5.5' of git://git.infradead.org/users/hch/dma-mappingLinus Torvalds1-4/+4
Pull dma-mapping updates from Christoph Hellwig: - improve dma-debug scalability (Eric Dumazet) - tiny dma-debug cleanup (Dan Carpenter) - check for vmap memory in dma_map_single (Kees Cook) - check for dma_addr_t overflows in dma-direct when using DMA offsets (Nicolas Saenz Julienne) - switch the x86 sta2x11 SOC to use more generic DMA code (Nicolas Saenz Julienne) - fix arm-nommu dma-ranges handling (Vladimir Murzin) - use __initdata in CMA (Shyam Saini) - replace the bus dma mask with a limit (Nicolas Saenz Julienne) - merge the remapping helpers into the main dma-direct flow (me) - switch xtensa to the generic dma remap handling (me) - various cleanups around dma_capable (me) - remove unused dev arguments to various dma-noncoherent helpers (me) * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux: * tag 'dma-mapping-5.5' of git://git.infradead.org/users/hch/dma-mapping: (22 commits) dma-mapping: treat dev->bus_dma_mask as a DMA limit dma-direct: exclude dma_direct_map_resource from the min_low_pfn check dma-direct: don't check swiotlb=force in dma_direct_map_resource dma-debug: clean up put_hash_bucket() powerpc: remove support for NULL dev in __phys_to_dma / __dma_to_phys dma-direct: avoid a forward declaration for phys_to_dma dma-direct: unify the dma_capable definitions dma-mapping: drop the dev argument to arch_sync_dma_for_* x86/PCI: sta2x11: use default DMA address translation dma-direct: check for overflows on 32 bit DMA addresses dma-debug: increase HASH_SIZE dma-debug: reorder struct dma_debug_entry fields xtensa: use the generic uncached segment support dma-mapping: merge the generic remapping helpers into dma-direct dma-direct: provide mmap and get_sgtable method overrides dma-direct: remove the dma_handle argument to __dma_direct_alloc_pages dma-direct: remove __dma_direct_free_pages usb: core: Remove redundant vmap checks kernel: dma-contiguous: mark CMA parameters __initdata/__initconst dma-debug: add a schedule point in debug_dma_dump_mappings() ...
2019-11-26Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds1-7/+4
Pull x86 asm updates from Ingo Molnar: "The main changes in this cycle were: - Cross-arch changes to move the linker sections for NOTES and EXCEPTION_TABLE into the RO_DATA area, where they belong on most architectures. (Kees Cook) - Switch the x86 linker fill byte from x90 (NOP) to 0xcc (INT3), to trap jumps into the middle of those padding areas instead of sliding execution. (Kees Cook) - A thorough cleanup of symbol definitions within x86 assembler code. The rather randomly named macros got streamlined around a (hopefully) straightforward naming scheme: SYM_START(name, linkage, align...) SYM_END(name, sym_type) SYM_FUNC_START(name) SYM_FUNC_END(name) SYM_CODE_START(name) SYM_CODE_END(name) SYM_DATA_START(name) SYM_DATA_END(name) etc - with about three times of these basic primitives with some label, local symbol or attribute variant, expressed via postfixes. No change in functionality intended. (Jiri Slaby) - Misc other changes, cleanups and smaller fixes" * 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits) x86/entry/64: Remove pointless jump in paranoid_exit x86/entry/32: Remove unused resume_userspace label x86/build/vdso: Remove meaningless CFLAGS_REMOVE_*.o m68k: Convert missed RODATA to RO_DATA x86/vmlinux: Use INT3 instead of NOP for linker fill bytes x86/mm: Report actual image regions in /proc/iomem x86/mm: Report which part of kernel image is freed x86/mm: Remove redundant address-of operators on addresses xtensa: Move EXCEPTION_TABLE to RO_DATA segment powerpc: Move EXCEPTION_TABLE to RO_DATA segment parisc: Move EXCEPTION_TABLE to RO_DATA segment microblaze: Move EXCEPTION_TABLE to RO_DATA segment ia64: Move EXCEPTION_TABLE to RO_DATA segment h8300: Move EXCEPTION_TABLE to RO_DATA segment c6x: Move EXCEPTION_TABLE to RO_DATA segment arm64: Move EXCEPTION_TABLE to RO_DATA segment alpha: Move EXCEPTION_TABLE to RO_DATA segment x86/vmlinux: Move EXCEPTION_TABLE to RO_DATA segment x86/vmlinux: Actually use _etext for the end of the text segment vmlinux.lds.h: Allow EXCEPTION_TABLE to live in RO_DATA ...
2019-11-25Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds2-10/+7
Pull arm64 updates from Catalin Marinas: "Apart from the arm64-specific bits (core arch and perf, new arm64 selftests), it touches the generic cow_user_page() (reviewed by Kirill) together with a macro for x86 to preserve the existing behaviour on this architecture. Summary: - On ARMv8 CPUs without hardware updates of the access flag, avoid failing cow_user_page() on PFN mappings if the pte is old. The patches introduce an arch_faults_on_old_pte() macro, defined as false on x86. When true, cow_user_page() makes the pte young before attempting __copy_from_user_inatomic(). - Covert the synchronous exception handling paths in arch/arm64/kernel/entry.S to C. - FTRACE_WITH_REGS support for arm64. - ZONE_DMA re-introduced on arm64 to support Raspberry Pi 4 - Several kselftest cases specific to arm64, together with a MAINTAINERS update for these files (moved to the ARM64 PORT entry). - Workaround for a Neoverse-N1 erratum where the CPU may fetch stale instructions under certain conditions. - Workaround for Cortex-A57 and A72 errata where the CPU may speculatively execute an AT instruction and associate a VMID with the wrong guest page tables (corrupting the TLB). - Perf updates for arm64: additional PMU topologies on HiSilicon platforms, support for CCN-512 interconnect, AXI ID filtering in the IMX8 DDR PMU, support for the CCPI2 uncore PMU in ThunderX2. - GICv3 optimisation to avoid a heavy barrier when accessing the ICC_PMR_EL1 register. - ELF HWCAP documentation updates and clean-up. - SMC calling convention conduit code clean-up. - KASLR diagnostics printed during boot - NVIDIA Carmel CPU added to the KPTI whitelist - Some arm64 mm clean-ups: use generic free_initrd_mem(), remove stale macro, simplify calculation in __create_pgd_mapping(), typos. - Kconfig clean-ups: CMDLINE_FORCE to depend on CMDLINE, choice for endinanness to help with allmodconfig" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (93 commits) arm64: Kconfig: add a choice for endianness kselftest: arm64: fix spelling mistake "contiguos" -> "contiguous" arm64: Kconfig: make CMDLINE_FORCE depend on CMDLINE MAINTAINERS: Add arm64 selftests to the ARM64 PORT entry arm64: kaslr: Check command line before looking for a seed arm64: kaslr: Announce KASLR status on boot kselftest: arm64: fake_sigreturn_misaligned_sp kselftest: arm64: fake_sigreturn_bad_size kselftest: arm64: fake_sigreturn_duplicated_fpsimd kselftest: arm64: fake_sigreturn_missing_fpsimd kselftest: arm64: fake_sigreturn_bad_size_for_magic0 kselftest: arm64: fake_sigreturn_bad_magic kselftest: arm64: add helper get_current_context kselftest: arm64: extend test_init functionalities kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht] kselftest: arm64: mangle_pstate_invalid_daif_bits kselftest: arm64: mangle_pstate_invalid_compat_toggle and common utils kselftest: arm64: extend toplevel skeleton Makefile drivers/perf: hisi: update the sccl_id/ccl_id for certain HiSilicon platform arm64: mm: reserve CMA and crashkernel in ZONE_DMA32 ...
2019-11-20dma-mapping: drop the dev argument to arch_sync_dma_for_*Christoph Hellwig1-4/+4
These are pure cache maintainance routines, so drop the unused struct device argument. Signed-off-by: Christoph Hellwig <hch@lst.de> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2019-11-06module/ftrace: handle patchable-function-entryMark Rutland2-10/+7
When using patchable-function-entry, the compiler will record the callsites into a section named "__patchable_function_entries" rather than "__mcount_loc". Let's abstract this difference behind a new FTRACE_CALLSITE_SECTION, so that architectures don't have to handle this explicitly (e.g. with custom module linker scripts). As parisc currently handles this explicitly, it is fixed up accordingly, with its custom linker script removed. Since FTRACE_CALLSITE_SECTION is only defined when DYNAMIC_FTRACE is selected, the parisc module loading code is updated to only use the definition in that case. When DYNAMIC_FTRACE is not selected, modules shouldn't have this section, so this removes some redundant work in that case. To make sure that this is keep up-to-date for modules and the main kernel, a comment is added to vmlinux.lds.h, with the existing ifdeffery simplified for legibility. I built parisc generic-{32,64}bit_defconfig with DYNAMIC_FTRACE enabled, and verified that the section made it into the .ko files for modules. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Helge Deller <deller@gmx.de> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Torsten Duwe <duwe@suse.de> Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Tested-by: Sven Schnelle <svens@stackframe.org> Tested-by: Torsten Duwe <duwe@suse.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com> Cc: Jessica Yu <jeyu@kernel.org> Cc: linux-parisc@vger.kernel.org
2019-11-04parisc: Move EXCEPTION_TABLE to RO_DATA segmentKees Cook1-3/+1
Since the EXCEPTION_TABLE is read-only, collapse it into RO_DATA. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Helge Deller <deller@gmx.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Sven Schnelle <svens@stackframe.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-24-keescook@chromium.org
2019-11-04vmlinux.lds.h: Replace RW_DATA_SECTION with RW_DATAKees Cook1-1/+1
Rename RW_DATA_SECTION to RW_DATA. (Calling this a "section" is a lie, since it's multiple sections and section flags cannot be applied to the macro.) Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-14-keescook@chromium.org
2019-11-04vmlinux.lds.h: Replace RO_DATA_SECTION with RO_DATAKees Cook1-2/+2
Finish renaming RO_DATA_SECTION to RO_DATA. (Calling this a "section" is a lie, since it's multiple sections and section flags cannot be applied to the macro.) Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-13-keescook@chromium.org
2019-11-04vmlinux.lds.h: Move NOTES into RO_DATAKees Cook1-1/+0
The .notes section should be non-executable read-only data. As such, move it to the RO_DATA macro instead of being per-architecture defined. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-alpha@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-ia64@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Segher Boessenkool <segher@kernel.crashing.org> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: https://lkml.kernel.org/r/20191029211351.13243-11-keescook@chromium.org
2019-11-04parisc: Avoid spurious inequivalent alias kernel error messagesJohn David Anglin1-1/+1
This patch changes flush_dcache_page() to only print inequivalent alias error messages on systems that require coherency. Inequivalent aliases can occur on systems that don't require coherency and this can cause spurious messages. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
2019-10-30parisc: fix frame pointer in ftrace_regs_caller()Sven Schnelle1-1/+1
The current code in ftrace_regs_caller() doesn't assign %r3 to contain the address of the current frame. This is hidden if the kernel is compiled with FRAME_POINTER, but without it just crashes because it tries to dereference an arbitrary address. Fix this by always setting %r3 to the current stack frame. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-10-10seccomp: simplify secure_computing()Christian Brauner1-1/+1
Afaict, the struct seccomp_data argument to secure_computing() is unused by all current callers. So let's remove it. The argument was added in [1]. It was added because having the arch supply the syscall arguments used to be faster than having it done by secure_computing() (cf. Andy's comment in [2]). This is not true anymore though. /* References */ [1]: 2f275de5d1ed ("seccomp: Add a seccomp_data parameter secure_computing()") [2]: https://lore.kernel.org/r/CALCETrU_fs_At-hTpr231kpaAd0z7xJN4ku-DvzhRU6cvcJA_w@mail.gmail.com Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Drewry <wad@chromium.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-parisc@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linux-um@lists.infradead.org Cc: x86@kernel.org Acked-by: Borislav Petkov <bp@suse.de> Acked-by: Andy Lutomirski <luto@kernel.org> Link: https://lore.kernel.org/r/20190924064420.6353-1-christian.brauner@ubuntu.com Signed-off-by: Kees Cook <keescook@chromium.org>
2019-09-08parisc: add support for kexec_file_load() syscallSven Schnelle3-0/+94
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-08parisc: wire up kexec_file_load syscallSven Schnelle1-1/+2
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-08parisc: add kexec syscall supportSven Schnelle3-0/+255
Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-08parisc: add __pdc_cpu_rendezvous()Sven Schnelle2-0/+14
When stopping SMP cpus send them into rendezvous, so we can start them again later (when kexec'ing a new kernel). Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-06kprobes/parisc: remove arch_kprobe_on_func_entry()Jisheng Zhang1-4/+0
The common kprobes provides a weak implementation of arch_kprobe_on_func_entry(). The parisc version is the same as the common version, so remove it. Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> Acked-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-09-05parisc: Drop comments which are already in pci.hHelge Deller1-11/+0
Signed-off-by: Helge Deller <deller@gmx.de>
2019-08-12parisc: speed up flush_tlb_all_local with qemuHelge Deller1-0/+9
When started in qemu, we know that qemu will drop all local TLB entries on any pxtlbe instruction. So, if we detect qemu, replace the whole flush_tlb_all_local function by one pdtlbe instruction. Signed-off-by: Helge Deller <deller@gmx.de>
2019-08-12parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMUHelge Deller1-6/+17
The macro ALTERNATIVE_CODE() allows assembly code to patch in a series of new assembler statements given at a specific start address. The ALT_COND_RUN_ON_QEMU condition is true if the kernel is started in a qemu emulation. Signed-off-by: Helge Deller <deller@gmx.de>
2019-08-03parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcatHelge Deller1-0/+4
Add performance-optimized versions of some string functions. Signed-off-by: Helge Deller <deller@gmx.de> Tested-by: Sven Schnelle <svens@stackframe.org>
2019-08-03parisc: trigger die notifier chain in parisc_terminate()Sven Schnelle1-0/+2
This will trigger kgdb/kdb when they are enabled. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-08-03parisc/ftrace: Add KPROBES_ON_FTRACESven Schnelle2-3/+154
Allow KPROBES to use the ftrace infrastructure on PA-RISC. Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-08-03parisc/ftrace: Add ARCH_SUPPORTS_FTRACE_OPS supportSven Schnelle1-2/+6
Pass ftrace_ops to ftrace functions to ftrace_trace_function(). Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-31parisc: fix race condition in patching codeSven Schnelle1-1/+2
Assume the following ftrace code sequence that was patched in earlier by ftrace_make_call(): PAGE A: ffc: addr of ftrace_caller() PAGE B: 000: 0x6fc10080 /* stw,ma r1,40(sp) */ 004: 0x48213fd1 /* ldw -18(r1),r1 */ 008: 0xe820c002 /* bv,n r0(r1) */ 00c: 0xe83f1fdf /* b,l,n .-c,r1 */ When a Code sequences that is to be patched spans a page break, we might have already cleared the part on the PAGE A. If an interrupt is coming in during the remap of the fixed mapping to PAGE B, it might execute the patched function with only parts of the FTRACE code cleared. To prevent this, clear the jump to our mini trampoline first, and clear the remaining parts after this. This might also happen when patch_text() patches a function that it calls during remap. Signed-off-by: Sven Schnelle <svens@stackframe.org> Cc: <stable@vger.kernel.org> # 5.2+ Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-21parisc: Flush ITLB in flush_tlb_all_local() only on split TLB machinesHelge Deller1-1/+2
flush_tlb_all_local() flushes the ITLB and DTLB of the CPU. In case the machine does not have separate ITLBs and DTLBs, use the alternative functionality to replace the code which flushes the ITLB with nops while keeping the code which flushes the DTLB. Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-17parisc: Wire up clone3 syscallHelge Deller2-1/+2
Signed-off-by: Helge Deller <deller@gmx.de> Tested-by: Sven Schnelle <svens@stackframe.org> Acked-by: Christian Brauner <christian@brauner.io>
2019-07-17parisc: Avoid kernel panic triggered by invalid kprobeHelge Deller1-0/+3
When running gdb I was able to trigger this kernel panic: Kernel Fault: Code=26 (Data memory access rights trap) at addr 0000000000000060 CPU: 0 PID: 1401 Comm: gdb-crash Not tainted 5.2.0-rc7-64bit+ #1053 YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI PSW: 00001000000001000000000000001111 Not tainted r00-03 000000000804000f 0000000040dee1a0 0000000040c78cf0 00000000b8d50160 r04-07 0000000040d2b1a0 000000004360a098 00000000bbbe87b8 0000000000000003 r08-11 00000000fac20a70 00000000fac24160 00000000fac1bbe0 0000000000000000 r12-15 00000000fabfb79a 00000000fac244a4 0000000000010000 0000000000000001 r16-19 00000000bbbe87b8 00000000f8f02910 0000000000010034 0000000000000000 r20-23 00000000fac24630 00000000fac24630 000000006474e552 00000000fac1aa52 r24-27 0000000000000028 00000000bbbe87b8 00000000bbbe87b8 0000000040d2b1a0 r28-31 0000000000000000 00000000b8d501c0 00000000b8d501f0 0000000003424000 sr00-03 0000000000423000 0000000000000000 0000000000000000 0000000000423000 sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000 IASQ: 0000000000000000 0000000000000000 IAOQ: 0000000040c78cf0 0000000040c78cf4 IIR: 539f00c0 ISR: 0000000000000000 IOR: 0000000000000060 CPU: 0 CR30: 00000000b8d50000 CR31: 00000000d22345e2 ORIG_R28: 0000000040250798 IAOQ[0]: parisc_kprobe_ss_handler+0x58/0x170 IAOQ[1]: parisc_kprobe_ss_handler+0x5c/0x170 RP(r2): parisc_kprobe_ss_handler+0x58/0x170 Backtrace: [<0000000040206ff8>] handle_interruption+0x178/0xbb8 Kernel panic - not syncing: Kernel Fault Avoid this panic by checking the return value of kprobe_running() and skip kprobe if none is currently active. Cc: <stable@vger.kernel.org> # v5.2 Acked-by: Sven Schnelle <svens@stackframe.org> Tested-by: Rolf Eike Beer <eike-kernel@sf-tec.de> Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-17parisc: Ensure userspace privilege for ptraced processes in regset functionsHelge Deller1-1/+2
On parisc the privilege level of a process is stored in the lowest two bits of the instruction pointers (IAOQ0 and IAOQ1). On Linux we use privilege level 0 for the kernel and privilege level 3 for user-space. So userspace should not be allowed to modify IAOQ0 or IAOQ1 of a ptraced process to change it's privilege level to e.g. 0 to try to gain kernel privileges. This patch prevents such modifications in the regset support functions by always setting the two lowest bits to one (which relates to privilege level 3 for user-space) if IAOQ0 or IAOQ1 are modified via ptrace regset calls. Link: https://bugs.gentoo.org/481768 Cc: <stable@vger.kernel.org> # v4.7+ Tested-by: Rolf Eike Beer <eike-kernel@sf-tec.de> Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-17parisc: Fix kernel panic due invalid values in IAOQ0 or IAOQ1Helge Deller1-10/+18
On parisc the privilege level of a process is stored in the lowest two bits of the instruction pointers (IAOQ0 and IAOQ1). On Linux we use privilege level 0 for the kernel and privilege level 3 for user-space. So userspace should not be allowed to modify IAOQ0 or IAOQ1 of a ptraced process to change it's privilege level to e.g. 0 to try to gain kernel privileges. This patch prevents such modifications by always setting the two lowest bits to one (which relates to privilege level 3 for user-space) if IAOQ0 or IAOQ1 are modified via ptrace calls in the native and compat ptrace paths. Link: https://bugs.gentoo.org/481768 Reported-by: Jeroen Roovers <jer@gentoo.org> Cc: <stable@vger.kernel.org> Tested-by: Rolf Eike Beer <eike-kernel@sf-tec.de> Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-15arch: mark syscall number 435 reserved for clone3Christian Brauner1-0/+1
A while ago Arnd made it possible to give new system calls the same syscall number on all architectures (except alpha). To not break this nice new feature let's mark 435 for clone3 as reserved on all architectures that do not yet implement it. Even if an architecture does not plan to implement it this ensures that new system calls coming after clone3 will have the same number on all architectures. Signed-off-by: Christian Brauner <christian@brauner.io> Cc: linux-arch@vger.kernel.org Cc: linux-alpha@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-ia64@vger.kernel.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-mips@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Link: https://lore.kernel.org/r/20190714192205.27190-2-christian@brauner.io Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Christian Brauner <christian@brauner.io>
2019-07-12Merge tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mappingLinus Torvalds1-35/+13
Pull dma-mapping updates from Christoph Hellwig: - move the USB special case that bounced DMA through a device bar into the USB code instead of handling it in the common DMA code (Laurentiu Tudor and Fredrik Noring) - don't dip into the global CMA pool for single page allocations (Nicolin Chen) - fix a crash when allocating memory for the atomic pool failed during boot (Florian Fainelli) - move support for MIPS-style uncached segments to the common code and use that for MIPS and nios2 (me) - make support for DMA_ATTR_NON_CONSISTENT and DMA_ATTR_NO_KERNEL_MAPPING generic (me) - convert nds32 to the generic remapping allocator (me) * tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping: (29 commits) dma-mapping: mark dma_alloc_need_uncached as __always_inline MIPS: only select ARCH_HAS_UNCACHED_SEGMENT for non-coherent platforms usb: host: Fix excessive alignment restriction for local memory allocations lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators nios2: use the generic uncached segment support in dma-direct nds32: use the generic remapping allocator for coherent DMA allocations arc: use the generic remapping allocator for coherent DMA allocations dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code dma-direct: handle DMA_ATTR_NON_CONSISTENT in common code dma-mapping: add a dma_alloc_need_uncached helper openrisc: remove the partial DMA_ATTR_NON_CONSISTENT support arc: remove the partial DMA_ATTR_NON_CONSISTENT support arm-nommu: remove the partial DMA_ATTR_NON_CONSISTENT support ARM: dma-mapping: allow larger DMA mask than supported dma-mapping: truncate dma masks to what dma_addr_t can hold iommu/dma: Apply dma_{alloc,free}_contiguous functions dma-remap: Avoid de-referencing NULL atomic_pool MIPS: use the generic uncached segment support in dma-direct dma-direct: provide generic support for uncached kernel segments au1100fb: fix DMA API abuse ...
2019-07-10Merge tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linuxLinus Torvalds1-0/+1
Pull pidfd updates from Christian Brauner: "This adds two main features. - First, it adds polling support for pidfds. This allows process managers to know when a (non-parent) process dies in a race-free way. The notification mechanism used follows the same logic that is currently used when the parent of a task is notified of a child's death. With this patchset it is possible to put pidfds in an {e}poll loop and get reliable notifications for process (i.e. thread-group) exit. - The second feature compliments the first one by making it possible to retrieve pollable pidfds for processes that were not created using CLONE_PIDFD. A lot of processes get created with traditional PID-based calls such as fork() or clone() (without CLONE_PIDFD). For these processes a caller can currently not create a pollable pidfd. This is a problem for Android's low memory killer (LMK) and service managers such as systemd. Both patchsets are accompanied by selftests. It's perhaps worth noting that the work done so far and the work done in this branch for pidfd_open() and polling support do already see some adoption: - Android is in the process of backporting this work to all their LTS kernels [1] - Service managers make use of pidfd_send_signal but will need to wait until we enable waiting on pidfds for full adoption. - And projects I maintain make use of both pidfd_send_signal and CLONE_PIDFD [2] and will use polling support and pidfd_open() too" [1] https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.9+backport%22 https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.14+backport%22 https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.19+backport%22 [2] https://github.com/lxc/lxc/blob/aab6e3eb73c343231cdde775db938994fc6f2803/src/lxc/start.c#L1753 * tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux: tests: add pidfd_open() tests arch: wire-up pidfd_open() pid: add pidfd_open() pidfd: add polling selftests pidfd: add polling support
2019-07-09Merge branch 'parisc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds7-55/+308
Pull parisc updates from Helge Deller: "Dynamic ftrace support by Sven Schnelle and a header guard fix by Denis Efremov" * 'parisc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: asm: psw.h: missing header guard parisc: add dynamic ftrace compiler.h: add CC_USING_PATCHABLE_FUNCTION_ENTRY parisc: use pr_debug() in kernel/module.c parisc: add WARN_ON() to clear_fixmap parisc: add spinlock to patch function parisc: add support for patching multiple words
2019-07-08Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespaceLinus Torvalds4-13/+13
Pull force_sig() argument change from Eric Biederman: "A source of error over the years has been that force_sig has taken a task parameter when it is only safe to use force_sig with the current task. The force_sig function is built for delivering synchronous signals such as SIGSEGV where the userspace application caused a synchronous fault (such as a page fault) and the kernel responded with a signal. Because the name force_sig does not make this clear, and because the force_sig takes a task parameter the function force_sig has been abused for sending other kinds of signals over the years. Slowly those have been fixed when the oopses have been tracked down. This set of changes fixes the remaining abusers of force_sig and carefully rips out the task parameter from force_sig and friends making this kind of error almost impossible in the future" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (27 commits) signal/x86: Move tsk inside of CONFIG_MEMORY_FAILURE in do_sigbus signal: Remove the signal number and task parameters from force_sig_info signal: Factor force_sig_info_to_task out of force_sig_info signal: Generate the siginfo in force_sig signal: Move the computation of force into send_signal and correct it. signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal signal: Remove the task parameter from force_sig_fault signal: Use force_sig_fault_to_task for the two calls that don't deliver to current signal: Explicitly call force_sig_fault on current signal/unicore32: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from __do_user_fault signal/arm: Remove tsk parameter from ptrace_break signal/nds32: Remove tsk parameter from send_sigtrap signal/riscv: Remove tsk parameter from do_trap signal/sh: Remove tsk parameter from force_sig_info_fault signal/um: Remove task parameter from send_sigtrap signal/x86: Remove task parameter from send_sigtrap signal: Remove task parameter from force_sig_mceerr signal: Remove task parameter from force_sig signal: Remove task parameter from force_sigsegv ...
2019-06-28arch: wire-up pidfd_open()Christian Brauner1-0/+1
This wires up the pidfd_open() syscall into all arches at once. Signed-off-by: Christian Brauner <christian@brauner.io> Reviewed-by: David Howells <dhowells@redhat.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Kees Cook <keescook@chromium.org> Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jann Horn <jannh@google.com> Cc: Andy Lutomirsky <luto@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Aleksa Sarai <cyphar@cyphar.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-api@vger.kernel.org Cc: linux-alpha@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-ia64@vger.kernel.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-mips@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org Cc: linux-arch@vger.kernel.org Cc: x86@kernel.org
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