linux-kernel - Re: [PATCH v2 02/19] elf: Move arch_setup_additional

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Date:   Tue, 24 Nov 2020 07:12:19 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will@...nel.org>, x86@...nel.org
Subject: Re: [PATCH v2 02/19] elf: Move arch_setup_additional_pages() to
 generic elf.h



Le 24/11/2020 à 01:29, Dmitry Safonov a écrit :
> Ifdef the function in the header, not in the code.
> Following kernel style, move it to Kconfig.
> All it makes it easier to follow when the option is enabled/disabled.
> Remove re-definition from compat_binfmt_elf, as it's always defined
> under compat_arch_setup_additional_pages (to be reworked).
> 
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
> ---
>   arch/arm/Kconfig                |  1 +
>   arch/arm/include/asm/elf.h      |  5 -----
>   arch/arm64/Kconfig              |  1 +
>   arch/arm64/include/asm/elf.h    |  6 +-----
>   arch/csky/Kconfig               |  1 +
>   arch/csky/include/asm/elf.h     |  4 ----
>   arch/hexagon/Kconfig            |  1 +
>   arch/hexagon/include/asm/elf.h  |  6 ------
>   arch/mips/Kconfig               |  1 +
>   arch/mips/include/asm/elf.h     |  5 -----
>   arch/nds32/Kconfig              |  1 +
>   arch/nds32/include/asm/elf.h    |  3 ---
>   arch/nios2/Kconfig              |  1 +
>   arch/nios2/include/asm/elf.h    |  4 ----
>   arch/powerpc/Kconfig            |  1 +
>   arch/powerpc/include/asm/elf.h  |  5 -----
>   arch/riscv/Kconfig              |  1 +
>   arch/riscv/include/asm/elf.h    |  4 ----
>   arch/s390/Kconfig               |  1 +
>   arch/s390/include/asm/elf.h     |  5 -----
>   arch/sh/Kconfig                 |  1 +
>   arch/sh/include/asm/elf.h       |  6 ------
>   arch/sparc/Kconfig              |  1 +
>   arch/sparc/include/asm/elf_64.h |  6 ------
>   arch/x86/Kconfig                |  1 +
>   arch/x86/include/asm/elf.h      |  4 ----
>   arch/x86/um/asm/elf.h           |  5 -----
>   fs/Kconfig.binfmt               |  3 +++
>   fs/binfmt_elf.c                 |  2 --
>   fs/binfmt_elf_fdpic.c           |  3 +--
>   fs/compat_binfmt_elf.c          |  2 --
>   include/linux/elf.h             | 12 ++++++++++++
>   32 files changed, 30 insertions(+), 73 deletions(-)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 6fd7d38a60c8..4221f171d1a9 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -134,6 +134,7 @@ config PPC
>   	select ARCH_HAS_PTE_SPECIAL
>   	select ARCH_HAS_MEMBARRIER_CALLBACKS
>   	select ARCH_HAS_MEMBARRIER_SYNC_CORE
> +	select ARCH_HAS_SETUP_ADDITIONAL_PAGES

We try to keep alphabetic order on powerpc, should go after ARCH_HAS_SCALED_CPUTIME

>   	select ARCH_HAS_SCALED_CPUTIME		if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
>   	select ARCH_HAS_STRICT_KERNEL_RWX	if (PPC32 && !HIBERNATION)
>   	select ARCH_HAS_TICK_BROADCAST		if GENERIC_CLOCKEVENTS_BROADCAST
> diff --git a/arch/powerpc/include/asm/elf.h b/arch/powerpc/include/asm/elf.h
> index 53ed2ca40151..ba0e1e331088 100644
> --- a/arch/powerpc/include/asm/elf.h
> +++ b/arch/powerpc/include/asm/elf.h
> @@ -111,11 +111,6 @@ extern int dcache_bsize;
>   extern int icache_bsize;
>   extern int ucache_bsize;
>   
> -/* vDSO has arch_setup_additional_pages */
> -#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
> -struct linux_binprm;
> -extern int arch_setup_additional_pages(struct linux_binprm *bprm,
> -				       int uses_interp);
>   #define VDSO_AUX_ENT(a,b) NEW_AUX_ENT(a,b)
>   
>   /* 1GB for 64bit, 8MB for 32bit */

Christophe