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

powerpc: Add missing headers

2022-05-08T12:15:40Z

Don't inherit headers "by chances" from asm/prom.h, asm/mpc52xx.h, asm/pci.h etc... Include the needed headers, and remove asm/prom.h when it was needed exclusively for pulling necessary headers. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/be8bdc934d152a7d8ee8d1a840d5596e2f7d85e0.1646767214.git.christophe.leroy@csgroup.eu

powerpc: fix typos in comments

2022-05-05T12:12:44Z

Various spelling mistakes in comments. Detected with the help of Coccinelle. Signed-off-by: Julia Lawall Reviewed-by: Joel Stanley Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220430185654.5855-1-Julia.Lawall@inria.fr

powerpc/kernel: Add __init attribute to eligible functions

2021-12-23T11:33:10Z

Some functions defined in `arch/powerpc/kernel` (and one in `arch/powerpc/ kexec`) are deserving of an `__init` macro attribute. These functions are only called by other initialization functions and therefore should inherit the attribute. Also, change function declarations in header files to include `__init`. Signed-off-by: Nick Child Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211216220035.605465-2-nick.child@ibm.com

powerpc/prom_init: Fix improper check of prom_getprop()

2021-11-25T00:25:33Z

prom_getprop() can return PROM_ERROR. Binary operator can not identify it. Fixes: 94d2dde738a5 ("[POWERPC] Efika: prune fixups and make them more carefull") Signed-off-by: Peiwei Hu Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/tencent_BA28CC6897B7C95A92EB8C580B5D18589105@qq.com

Merge tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2021-09-03T22:33:47Z

Pull Kbuild updates from Masahiro Yamada: - Add -s option (strict mode) to merge_config.sh to make it fail when any symbol is redefined. - Show a warning if a different compiler is used for building external modules. - Infer --target from ARCH for CC=clang to let you cross-compile the kernel without CROSS_COMPILE. - Make the integrated assembler default (LLVM_IAS=1) for CC=clang. - Add to the kernel source instead of borrowing from the compiler. - Add Nick Desaulniers as a Kbuild reviewer. - Drop stale cc-option tests. - Fix the combination of CONFIG_TRIM_UNUSED_KSYMS and CONFIG_LTO_CLANG to handle symbols in inline assembly. - Show a warning if 'FORCE' is missing for if_changed rules. - Various cleanups * tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (39 commits) kbuild: redo fake deps at include/ksym/*.h kbuild: clean up objtool_args slightly modpost: get the *.mod file path more simply checkkconfigsymbols.py: Fix the '--ignore' option kbuild: merge vmlinux_link() between ARCH=um and other architectures kbuild: do not remove 'linux' link in scripts/link-vmlinux.sh kbuild: merge vmlinux_link() between the ordinary link and Clang LTO kbuild: remove stale *.symversions kbuild: remove unused quiet_cmd_update_lto_symversions gen_compile_commands: extract compiler command from a series of commands x86: remove cc-option-yn test for -mtune= arc: replace cc-option-yn uses with cc-option s390: replace cc-option-yn uses with cc-option ia64: move core-y in arch/ia64/Makefile to arch/ia64/Kbuild sparc: move the install rule to arch/sparc/Makefile security: remove unneeded subdir-$(CONFIG_...) kbuild: sh: remove unused install script kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y kbuild: Switch to 'f' variants of integrated assembler flag kbuild: Shuffle blank line to improve comment meaning ...

isystem: ship and use stdarg.h

2021-08-19T00:02:55Z

Ship minimal stdarg.h (1 type, 4 macros) as . stdarg.h is the only userspace header commonly used in the kernel. GPL 2 version of can be extracted from http://archive.debian.org/debian/pool/main/g/gcc-4.2/gcc-4.2_4.2.4.orig.tar.gz Signed-off-by: Alexey Dobriyan Acked-by: Rafael J. Wysocki Acked-by: Ard Biesheuvel Signed-off-by: Masahiro Yamada

powerpc/pseries: Add support for FORM2 associativity

2021-08-13T12:04:27Z

PAPR interface currently supports two different ways of communicating resource grouping details to the OS. These are referred to as Form 0 and Form 1 associativity grouping. Form 0 is the older format and is now considered deprecated. This patch adds another resource grouping named FORM2. Signed-off-by: Daniel Henrique Barboza Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210812132223.225214-6-aneesh.kumar@linux.ibm.com

powerpc/pseries: Rename TYPE1_AFFINITY to FORM1_AFFINITY

2021-08-13T12:04:26Z

Also make related code cleanup that will allow adding FORM2_AFFINITY in later patches. No functional change in this patch. Signed-off-by: Aneesh Kumar K.V Reviewed-by: David Gibson Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210812132223.225214-3-aneesh.kumar@linux.ibm.com

powerpc/64s: Make prom_init require RELOCATABLE

2021-06-25T04:47:19Z

When we boot from open firmware (OF) using PPC_OF_BOOT_TRAMPOLINE, aka. prom_init, we run parts of the kernel at an address other than the link address. That happens because OF loads the kernel above zero (OF is at zero) and we run prom_init before copying the kernel down to zero. Currently that works even for non-relocatable kernels, because we do various fixups to the prom_init code to make it run where it's loaded. However those fixups are not sufficient if the kernel becomes large enough. In that case prom_init()'s final call to __start() can end up generating a plt branch: bl c000000002000018 <00000078.plt_branch.__start> That results in the kernel jumping to the linked address of __start, 0xc000000000000000, when really it needs to jump to the 0xc000000000000000 + the runtime address because the kernel is still running at the load address. We could do further shenanigans to handle that, see Jordan's patch for example: https://lore.kernel.org/linuxppc-dev/20210421021721.1539289-1-jniethe5@gmail.com However it is much simpler to just require a kernel with prom_init() to be built relocatable. The result works in all configurations without further work, and requires less code. This should have no effect on most people, as our defconfigs and essentially all distro configs already have RELOCATABLE enabled. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210623130454.2542945-1-mpe@ellerman.id.au

powerpc/64s: avoid reloading (H)SRR registers if they are still valid

2021-06-24T14:06:55Z

When an interrupt is taken, the SRR registers are set to return to where it left off. Unless they are modified in the meantime, or the return address or MSR are modified, there is no need to reload these registers when returning from interrupt. Introduce per-CPU flags that track the validity of SRR and HSRR registers. These are cleared when returning from interrupt, when using the registers for something else (e.g., OPAL calls), when adjusting the return address or MSR of a context, and when context switching (which changes the return address and MSR). This improves the performance of interrupt returns. Signed-off-by: Nicholas Piggin [mpe: Fold in fixup patch from Nick] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210617155116.2167984-5-npiggin@gmail.com