linux-kernel - Re: [PATCH] asm-generic: Drop getrlimit and setrlimit syscalls from default list

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Message-ID: <20161024090931.GR7370@jhogan-linux.le.imgtec.org>
Date:   Mon, 24 Oct 2016 10:09:31 +0100
From:   James Hogan <james.hogan@...tec.com>
To:     Yury Norov <ynorov@...iumnetworks.com>
CC:     Arnd Bergmann <arnd@...db.de>, <linux-arch@...r.kernel.or>,
        Vineet Gupta <vgupta@...opsys.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Salter <msalter@...hat.com>,
        Aurelien Jacquiot <a-jacquiot@...com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Richard Kuo <rkuo@...eaurora.org>,
        Ley Foon Tan <lftan@...era.com>,
        Jonas Bonn <jonas@...thpole.se>,
        Chen Liqin <liqin.linux@...il.com>,
        Lennox Wu <lennox.wu@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Guan Xuetao <gxt@...c.pku.edu.cn>,
        Andrew Pinski <Andrew.Pinski@...ium.com>,
        <linux-snps-arc@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-c6x-dev@...ux-c6x.org>,
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        <linux-hexagon@...r.kernel.org>, <linux-metag@...r.kernel.org>,
        <nios2-dev@...ts.rocketboards.org>
Subject: Re: [PATCH] asm-generic: Drop getrlimit and setrlimit syscalls from
 default list

On Sat, Oct 22, 2016 at 03:14:04PM +0300, Yury Norov wrote:
> The newer prlimit64 syscall provides all the functionality provided by
> the getrlimit and setrlimit syscalls and adds the pid of target process,
> so future architectures won't need to include getrlimit and setrlimit.
> 
> Therefore drop getrlimit and setrlimit syscalls from the generic syscall
> list unless __ARCH_WANT_SET_GET_RLIMIT is defined by the architecture's
> unistd.h prior to including asm-generic/unistd.h, and adjust all
> architectures using the generic syscall list to define it so that no
> in-tree architectures are affected.
> 
> Cc: Vineet Gupta <vgupta@...opsys.com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Mark Salter <msalter@...hat.com>
> Cc: Aurelien Jacquiot <a-jacquiot@...com>
> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> Cc: Richard Kuo <rkuo@...eaurora.org>
> Cc: James Hogan <james.hogan@...tec.com>
> Cc: Ley Foon Tan <lftan@...era.com>
> Cc: Jonas Bonn <jonas@...thpole.se>
> Cc: Chen Liqin <liqin.linux@...il.com>
> Cc: Lennox Wu <lennox.wu@...il.com>
> Cc: Chris Metcalf <cmetcalf@...lanox.com>
> Cc: Guan Xuetao <gxt@...c.pku.edu.cn>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Andrew Pinski <Andrew.Pinski@...ium.com>
> Cc: linux-snps-arc@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-c6x-dev@...ux-c6x.org
> Cc: uclinux-h8-devel@...ts.sourceforge.jp
> Cc: linux-hexagon@...r.kernel.org
> Cc: linux-metag@...r.kernel.org
> Cc: nios2-dev@...ts.rocketboards.org
> Cc: linux-arch@...r.kernel.or
> Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
> 
> ---
>  arch/arc/include/uapi/asm/unistd.h       | 1 +
>  arch/arm64/include/uapi/asm/unistd.h     | 1 +
>  arch/c6x/include/uapi/asm/unistd.h       | 1 +
>  arch/h8300/include/uapi/asm/unistd.h     | 1 +
>  arch/hexagon/include/uapi/asm/unistd.h   | 1 +
>  arch/metag/include/uapi/asm/unistd.h     | 1 +

Acked-by: James Hogan <james.hogan@...tec.com> [metag]

Cheers
James

>  arch/nios2/include/uapi/asm/unistd.h     | 1 +
>  arch/openrisc/include/uapi/asm/unistd.h  | 1 +
>  arch/score/include/uapi/asm/unistd.h     | 1 +
>  arch/tile/include/uapi/asm/unistd.h      | 1 +
>  arch/unicore32/include/uapi/asm/unistd.h | 1 +
>  include/uapi/asm-generic/unistd.h        | 5 +++++
>  12 files changed, 16 insertions(+)
> 
> diff --git a/arch/arc/include/uapi/asm/unistd.h b/arch/arc/include/uapi/asm/unistd.h
> index 41fa2ec..928546d 100644
> --- a/arch/arc/include/uapi/asm/unistd.h
> +++ b/arch/arc/include/uapi/asm/unistd.h
> @@ -16,6 +16,7 @@
>  #define _UAPI_ASM_ARC_UNISTD_H
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_SYS_EXECVE
>  #define __ARCH_WANT_SYS_CLONE
>  #define __ARCH_WANT_SYS_VFORK
> diff --git a/arch/arm64/include/uapi/asm/unistd.h b/arch/arm64/include/uapi/asm/unistd.h
> index 043d17a..48355a6 100644
> --- a/arch/arm64/include/uapi/asm/unistd.h
> +++ b/arch/arm64/include/uapi/asm/unistd.h
> @@ -15,5 +15,6 @@
>   */
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  
>  #include <asm-generic/unistd.h>
> diff --git a/arch/c6x/include/uapi/asm/unistd.h b/arch/c6x/include/uapi/asm/unistd.h
> index 12d73d9..f676231 100644
> --- a/arch/c6x/include/uapi/asm/unistd.h
> +++ b/arch/c6x/include/uapi/asm/unistd.h
> @@ -15,6 +15,7 @@
>   */
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_SYS_CLONE
>  
>  /* Use the standard ABI for syscalls. */
> diff --git a/arch/h8300/include/uapi/asm/unistd.h b/arch/h8300/include/uapi/asm/unistd.h
> index 7dd20ef..2f98394 100644
> --- a/arch/h8300/include/uapi/asm/unistd.h
> +++ b/arch/h8300/include/uapi/asm/unistd.h
> @@ -1,5 +1,6 @@
>  #define __ARCH_NOMMU
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  
>  #include <asm-generic/unistd.h>
> diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h
> index 2151760..52d585c 100644
> --- a/arch/hexagon/include/uapi/asm/unistd.h
> +++ b/arch/hexagon/include/uapi/asm/unistd.h
> @@ -28,6 +28,7 @@
>  
>  #define sys_mmap2 sys_mmap_pgoff
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_SYS_EXECVE
>  #define __ARCH_WANT_SYS_CLONE
>  #define __ARCH_WANT_SYS_VFORK
> diff --git a/arch/metag/include/uapi/asm/unistd.h b/arch/metag/include/uapi/asm/unistd.h
> index 459b6ec..16b5cb3 100644
> --- a/arch/metag/include/uapi/asm/unistd.h
> +++ b/arch/metag/include/uapi/asm/unistd.h
> @@ -8,6 +8,7 @@
>   */
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  
>  /* Use the standard ABI for syscalls. */
>  #include <asm-generic/unistd.h>
> diff --git a/arch/nios2/include/uapi/asm/unistd.h b/arch/nios2/include/uapi/asm/unistd.h
> index 51a32c7..b0dda4d 100644
> --- a/arch/nios2/include/uapi/asm/unistd.h
> +++ b/arch/nios2/include/uapi/asm/unistd.h
> @@ -18,6 +18,7 @@
>   #define sys_mmap2 sys_mmap_pgoff
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  
>  /* Use the standard ABI for syscalls */
>  #include <asm-generic/unistd.h>
> diff --git a/arch/openrisc/include/uapi/asm/unistd.h b/arch/openrisc/include/uapi/asm/unistd.h
> index 471905b..6812d81 100644
> --- a/arch/openrisc/include/uapi/asm/unistd.h
> +++ b/arch/openrisc/include/uapi/asm/unistd.h
> @@ -21,6 +21,7 @@
>  #define sys_mmap2 sys_mmap_pgoff
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_SYS_FORK
>  #define __ARCH_WANT_SYS_CLONE
>  
> diff --git a/arch/score/include/uapi/asm/unistd.h b/arch/score/include/uapi/asm/unistd.h
> index d4008c3..7ad1bdc 100644
> --- a/arch/score/include/uapi/asm/unistd.h
> +++ b/arch/score/include/uapi/asm/unistd.h
> @@ -1,6 +1,7 @@
>  #define __ARCH_HAVE_MMU
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  #define __ARCH_WANT_SYSCALL_NO_AT
>  #define __ARCH_WANT_SYSCALL_NO_FLAGS
>  #define __ARCH_WANT_SYSCALL_OFF_T
> diff --git a/arch/tile/include/uapi/asm/unistd.h b/arch/tile/include/uapi/asm/unistd.h
> index 24e9187..cf0505f 100644
> --- a/arch/tile/include/uapi/asm/unistd.h
> +++ b/arch/tile/include/uapi/asm/unistd.h
> @@ -13,6 +13,7 @@
>   */
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  #if !defined(__LP64__) || defined(__SYSCALL_COMPAT)
>  /* Use the flavor of this syscall that matches the 32-bit API better. */
>  #define __ARCH_WANT_SYNC_FILE_RANGE2
> diff --git a/arch/unicore32/include/uapi/asm/unistd.h b/arch/unicore32/include/uapi/asm/unistd.h
> index 1f63c47..ef25aec 100644
> --- a/arch/unicore32/include/uapi/asm/unistd.h
> +++ b/arch/unicore32/include/uapi/asm/unistd.h
> @@ -11,6 +11,7 @@
>   */
>  
>  #define __ARCH_WANT_RENAMEAT
> +#define __ARCH_WANT_SET_GET_RLIMIT
>  
>  /* Use the standard ABI for syscalls. */
>  #include <asm-generic/unistd.h>
> diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> index 9b1462e..bbaeac0 100644
> --- a/include/uapi/asm-generic/unistd.h
> +++ b/include/uapi/asm-generic/unistd.h
> @@ -465,10 +465,15 @@ __SYSCALL(__NR_uname, sys_newuname)
>  __SYSCALL(__NR_sethostname, sys_sethostname)
>  #define __NR_setdomainname 162
>  __SYSCALL(__NR_setdomainname, sys_setdomainname)
> +
> +#ifdef __ARCH_WANT_SET_GET_RLIMIT
> +/* getrlimit and setrlimit are superseded with prlimit64 */
>  #define __NR_getrlimit 163
>  __SC_COMP(__NR_getrlimit, sys_getrlimit, compat_sys_getrlimit)
>  #define __NR_setrlimit 164
>  __SC_COMP(__NR_setrlimit, sys_setrlimit, compat_sys_setrlimit)
> +#endif
> +
>  #define __NR_getrusage 165
>  __SC_COMP(__NR_getrusage, sys_getrusage, compat_sys_getrusage)
>  #define __NR_umask 166
> -- 
> 2.7.4
> 

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