linux-kernel - Re: [PATCH 1/1] Replace macro "ARCH_HAVE_EXTRA_ELF

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Date: Fri, 12 Apr 2024 22:07:39 +1000
From: Michael Ellerman <mpe@...erman.id.au>
To: Vignesh Balasubramanian <vigbalas@....com>,
 linux-kernel@...r.kernel.org, linux-toolchains@...r.kernel.org
Cc: npiggin@...il.com, christophe.leroy@...roup.eu, aneesh.kumar@...nel.org,
 naveen.n.rao@...ux.ibm.com, ebiederm@...ssion.com, keescook@...omium.org,
 x86@...nel.org, linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
 bpetkov@....com, jinisusan.george@....com, matz@...e.de,
 binutils@...rceware.org, jhb@...eBSD.org, felix.willgerodt@...el.com,
 Vignesh Balasubramanian <vigbalas@....com>
Subject: Re: [PATCH 1/1] Replace macro "ARCH_HAVE_EXTRA_ELF_NOTES" with kconfig

Vignesh Balasubramanian <vigbalas@....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@....com>
> Signed-off-by: Jini Susan George <jinisusan.george@....com>
> Signed-off-by: Vignesh Balasubramanian <vigbalas@....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@...erman.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