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

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Date:   Tue, 25 Oct 2016 08:47:48 +0800
From:   Ley Foon Tan <lftan@...era.com>
To:     James Hogan <james.hogan@...tec.com>
Cc:     Yury Norov <ynorov@...iumnetworks.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux-Arch <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>,
        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-kernel@...r.kernel.org>,
        linux-arm <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" <nios2-dev@...ts.rocketboards.org>
Subject: Re: [PATCH] asm-generic: Drop getrlimit and setrlimit syscalls from
 default list

On Mon, Oct 24, 2016 at 5:09 PM, James Hogan <james.hogan@...tec.com> wrote:
> 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 +
Acked-by: Ley Foon Tan <lftan@...era.com> [nios2]


>>  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
>>