Re: [PATCH 1/1] Replace macro "ARCH_HAVE_EXTRA_ELF_NOTES" with kconfig

Michael Ellerman
2024-04-12T12:07:52Z

Vignesh Balasubramanian <vigbalas@amd.com> writes:
> "ARCH_HAVE_EXTRA_ELF_NOTES" enables an extra note section in the
> core dump. Kconfig variable is preferred over ARCH_HAVE_* macro.
>
> Co-developed-by: Jini Susan George <jinisusan.george@amd.com>
> Signed-off-by: Jini Susan George <jinisusan.george@amd.com>
> Signed-off-by: Vignesh Balasubramanian <vigbalas@amd.com>
> ---
> arch/Kconfig | 9 +++++++++
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/include/asm/elf.h | 2 --
> include/linux/elf.h | 2 +-
> 4 files changed, 11 insertions(+), 3 deletions(-)

Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)

cheers

> diff --git a/arch/Kconfig b/arch/Kconfig
> index 9f066785bb71..143f021c8a76 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -502,6 +502,15 @@ config MMU_LAZY_TLB_SHOOTDOWN
> config ARCH_HAVE_NMI_SAFE_CMPXCHG
> bool
>
> +config ARCH_HAVE_EXTRA_ELF_NOTES
> + bool
> + help
> + An architecture should select this in order to enable adding an
> + arch-specific ELF note section to core files. It must provide two
> + functions: elf_coredump_extra_notes_size() and
> + elf_coredump_extra_notes_write() which are invoked by the ELF core
> + dumper.
> +
> config ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
> bool
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 1c4be3373686..c45fa9d7fb76 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -156,6 +156,7 @@ config PPC
> select ARCH_HAS_UACCESS_FLUSHCACHE
> select ARCH_HAS_UBSAN
> select ARCH_HAVE_NMI_SAFE_CMPXCHG
> + select ARCH_HAVE_EXTRA_ELF_NOTES if SPU_BASE
> select ARCH_KEEP_MEMBLOCK
> select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE if PPC_RADIX_MMU
> select ARCH_MIGHT_HAVE_PC_PARPORT
> diff --git a/arch/powerpc/include/asm/elf.h b/arch/powerpc/include/asm/elf.h
> index 79f1c480b5eb..bb4b94444d3e 100644
> --- a/arch/powerpc/include/asm/elf.h
> +++ b/arch/powerpc/include/asm/elf.h
> @@ -127,8 +127,6 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm,
> /* Notes used in ET_CORE. Note name is "SPU/<fd>/<filename>". */
> #define NT_SPU 1
>
> -#define ARCH_HAVE_EXTRA_ELF_NOTES
> -
> #endif /* CONFIG_SPU_BASE */
>
> #ifdef CONFIG_PPC64
> diff --git a/include/linux/elf.h b/include/linux/elf.h
> index c9a46c4e183b..5c402788da19 100644
> --- a/include/linux/elf.h
> +++ b/include/linux/elf.h
> @@ -65,7 +65,7 @@ extern Elf64_Dyn _DYNAMIC [];
> struct file;
> struct coredump_params;
>
> -#ifndef ARCH_HAVE_EXTRA_ELF_NOTES
> +#ifndef CONFIG_ARCH_HAVE_EXTRA_ELF_NOTES
> static inline int elf_coredump_extra_notes_size(void) { return 0; }
> static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
> #else
> --
> 2.34.1