linux-dev/arch/powerpc/kernel/asm-offsets.c, branch linus/master

powerpc/ftrace: Add support for livepatch to PPC32

2022-02-07T10:03:10Z

PPC64 needs some special logic to properly set up the TOC. See commit 85baa095497f ("powerpc/livepatch: Add live patching support on ppc64le") for details. PPC32 doesn't have TOC so it doesn't need that logic, so adding LIVEPATCH support is straight forward. Add CONFIG_LIVEPATCH_64 and move livepatch stack logic into that item. Livepatch sample modules all work. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/63cb094125b6a6038c65eeac2abaabbabe63addd.1640017960.git.christophe.leroy@csgroup.eu

powerpc/config: Add CONFIG_BOOKE_OR_40x

2021-12-09T11:41:19Z

We have many functionnalities common to 40x and BOOKE, it leads to many places with #if defined(CONFIG_BOOKE) || defined(CONFIG_40x). We are going to add a few more with KUAP for booke/40x, so create a new symbol which is defined when either BOOKE or 40x is defined. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/9a3dbd60924cb25c9f944d3d8205ac5a0d15e229.1634627931.git.christophe.leroy@csgroup.eu

powerpc/32s: Save content of sr0 to avoid 'mfsr'

2021-12-09T11:41:17Z

Calling 'mfsr' to get the content of segment registers is heavy, in addition it requires clearing of the 'reserved' bits. In order to avoid this operation, save it in mm context and in thread struct. The saved sr0 is the one used by kernel, this means that on locking entry it can be used as is. For unlocking, the only thing to do is to clear SR_NX. This improves null_syscall selftest by 12 cycles, ie 4%. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b02baf2ed8f09bad910dfaeeb7353b2ae6830525.1634627931.git.christophe.leroy@csgroup.eu

powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU

2021-12-09T11:41:13Z

Compiling out hash support code when CONFIG_PPC_64S_HASH_MMU=n saves 128kB kernel image size (90kB text) on powernv_defconfig minus KVM, 350kB on pseries_defconfig minus KVM, 40kB on a tiny config. Signed-off-by: Nicholas Piggin [mpe: Fixup defined(ARCH_HAS_MEMREMAP_COMPAT_ALIGN), which needs CONFIG. Fix radix_enabled() use in setup_initial_memory_limit(). Add some stubs to reduce number of ifdefs.] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211201144153.2456614-18-npiggin@gmail.com

powerpc: smp: remove hack to obtain offset of task_struct::cpu

2021-09-30T14:13:11Z

Instead of relying on awful hacks to obtain the offset of the cpu field in struct task_struct, move it back into struct thread_info, which does not create the same level of circular dependency hell when trying to include the header file that defines it. Signed-off-by: Ard Biesheuvel Acked-by: Mark Rutland Acked-by: Michael Ellerman

sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y

2021-09-30T14:13:10Z

THREAD_INFO_IN_TASK moved the CPU field out of thread_info, but this causes some issues on architectures that define raw_smp_processor_id() in terms of this field, due to the fact that #include'ing linux/sched.h to get at struct task_struct is problematic in terms of circular dependencies. Given that thread_info and task_struct are the same data structure anyway when THREAD_INFO_IN_TASK=y, let's move it back so that having access to the type definition of struct thread_info is sufficient to reference the CPU number of the current task. Note that this requires THREAD_INFO_IN_TASK's definition of the task_thread_info() helper to be updated, as task_cpu() takes a pointer-to-const, whereas task_thread_info() (which is used to generate lvalues as well), needs a non-const pointer. So make it a macro instead. Signed-off-by: Ard Biesheuvel Acked-by: Catalin Marinas Acked-by: Mark Rutland Acked-by: Michael Ellerman

Merge branch 'fixes' into next

2021-09-03T12:54:12Z

Merge our fixes branch into next. That lets us resolve a conflict in arch/powerpc/sysdev/xive/common.c. Between cbc06f051c52 ("powerpc/xive: Do not skip CPU-less nodes when creating the IPIs"), which moved request_irq() out of xive_init_ipis(), and 17df41fec5b8 ("powerpc: use IRQF_NO_DEBUG for IPIs") which added IRQF_NO_DEBUG to that request_irq() call, which has now moved.

powerpc/64e: Get dear offset with _DEAR macro

2021-08-26T11:21:07Z

Use _DEAR to get the offset of dear register in pr_regs for 64e cpus. Signed-off-by: Xiongwei Song Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210807010239.416055-5-sxwjean@me.com

powerpc/64e: Get esr offset with _ESR macro

2021-08-26T11:21:07Z

Use _ESR to get the offset of esr register in pr_regs for 64e cpus. Signed-off-by: Xiongwei Song Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210807010239.416055-3-sxwjean@me.com

powerpc/32: Fix critical and debug interrupts on BOOKE

2021-08-06T22:53:59Z

32 bits BOOKE have special interrupts for debug and other critical events. When handling those interrupts, dedicated registers are saved in the stack frame in addition to the standard registers, leading to a shift of the pt_regs struct. Since commit db297c3b07af ("powerpc/32: Don't save thread.regs on interrupt entry"), the pt_regs struct is expected to be at the same place all the time. Instead of handling a special struct in addition to pt_regs, just add those special registers to struct pt_regs. Fixes: db297c3b07af ("powerpc/32: Don't save thread.regs on interrupt entry") Cc: stable@vger.kernel.org Reported-by: Radu Rendec Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/028d5483b4851b01ea4334d0751e7f260419092b.1625637264.git.christophe.leroy@csgroup.eu