Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 15 Jan 2019 11:52:29 +0000
From:   Russell King - ARM Linux admin <linux@armlinux.org.uk>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     y2038@lists.linaro.org, linux-api@vger.kernel.org,
        linux-kernel@vger.kernel.org, ink@jurassic.park.msu.ru,
        mattst88@gmail.com, catalin.marinas@arm.com, will.deacon@arm.com,
        tony.luck@intel.com, fenghua.yu@intel.com, geert@linux-m68k.org,
        monstr@monstr.eu, paul.burton@mips.com, deller@gmx.de,
        mpe@ellerman.id.au, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, dalias@libc.org, davem@davemloft.net,
        luto@kernel.org, tglx@linutronix.de, mingo@redhat.com,
        hpa@zytor.com, x86@kernel.org, jcmvbkbc@gmail.com,
        firoz.khan@linaro.org, ebiederm@xmission.com,
        deepa.kernel@gmail.com, linux@dominikbrodowski.net,
        akpm@linux-foundation.org, dave@stgolabs.net,
        linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
        linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org
Subject: Re: [PATCH 15/15] arch: add pkey and rseq syscall numbers everywhere
Message-ID: <20190115115229.mcrmmpwdmjxf2cra@e5254000004ec.dyn.armlinux.org.uk>
References: <20190110162435.309262-1-arnd@arndb.de>
 <20190110162435.309262-16-arnd@arndb.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20190110162435.309262-16-arnd@arndb.de>
User-Agent: NeoMutt/20170113 (1.7.2)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Jan 10, 2019 at 05:24:35PM +0100, Arnd Bergmann wrote:
> Most architectures define system call numbers for the rseq and pkey system
> calls, even when they don't support the features, and perhaps never will.
> 
> Only a few architectures are missing these, so just define them anyway
> for consistency. If we decide to add them later to one of these, the
> system call numbers won't get out of sync then.

I was lambasted for adding the pkey syscalls for 32-bit ARM in 2016,
which will probably never support it.  Why has the attitude towards
this kind of thing now apparently become acceptable?

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/alpha/include/asm/unistd.h         | 4 ----
>  arch/alpha/kernel/syscalls/syscall.tbl  | 4 ++++
>  arch/ia64/kernel/syscalls/syscall.tbl   | 4 ++++
>  arch/m68k/kernel/syscalls/syscall.tbl   | 4 ++++
>  arch/parisc/include/asm/unistd.h        | 3 ---
>  arch/parisc/kernel/syscalls/syscall.tbl | 4 ++++
>  arch/s390/include/asm/unistd.h          | 3 ---
>  arch/s390/kernel/syscalls/syscall.tbl   | 3 +++
>  arch/sh/kernel/syscalls/syscall.tbl     | 4 ++++
>  arch/sparc/include/asm/unistd.h         | 5 -----
>  arch/sparc/kernel/syscalls/syscall.tbl  | 4 ++++
>  arch/xtensa/kernel/syscalls/syscall.tbl | 1 +
>  12 files changed, 28 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h
> index 564ba87bdc38..31ad350b58a0 100644
> --- a/arch/alpha/include/asm/unistd.h
> +++ b/arch/alpha/include/asm/unistd.h
> @@ -29,9 +29,5 @@
>  #define __IGNORE_getppid
>  #define __IGNORE_getuid
>  
> -/* Alpha doesn't have protection keys. */
> -#define __IGNORE_pkey_mprotect
> -#define __IGNORE_pkey_alloc
> -#define __IGNORE_pkey_free
>  
>  #endif /* _ALPHA_UNISTD_H */
> diff --git a/arch/alpha/kernel/syscalls/syscall.tbl b/arch/alpha/kernel/syscalls/syscall.tbl
> index b0e247287908..25b4a7e76943 100644
> --- a/arch/alpha/kernel/syscalls/syscall.tbl
> +++ b/arch/alpha/kernel/syscalls/syscall.tbl
> @@ -452,3 +452,7 @@
>  521	common	pwritev2			sys_pwritev2
>  522	common	statx				sys_statx
>  523	common	io_pgetevents			sys_io_pgetevents
> +524	common	pkey_alloc			sys_pkey_alloc
> +525	common	pkey_free			sys_pkey_free
> +526	common	pkey_mprotect			sys_pkey_mprotect
> +527	common	rseq				sys_rseq
> diff --git a/arch/ia64/kernel/syscalls/syscall.tbl b/arch/ia64/kernel/syscalls/syscall.tbl
> index 2e93dbdcdb80..84e03de00177 100644
> --- a/arch/ia64/kernel/syscalls/syscall.tbl
> +++ b/arch/ia64/kernel/syscalls/syscall.tbl
> @@ -339,3 +339,7 @@
>  327	common	io_pgetevents			sys_io_pgetevents
>  328	common	perf_event_open			sys_perf_event_open
>  329	common	seccomp				sys_seccomp
> +330	common	pkey_alloc			sys_pkey_alloc
> +331	common	pkey_free			sys_pkey_free
> +332	common	pkey_mprotect			sys_pkey_mprotect
> +333	common	rseq				sys_rseq
> diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
> index 5354ba02eed2..ae88b85d068e 100644
> --- a/arch/m68k/kernel/syscalls/syscall.tbl
> +++ b/arch/m68k/kernel/syscalls/syscall.tbl
> @@ -388,6 +388,10 @@
>  378	common	pwritev2			sys_pwritev2
>  379	common	statx				sys_statx
>  380	common	seccomp				sys_seccomp
> +381	common	pkey_alloc			sys_pkey_alloc
> +382	common	pkey_free			sys_pkey_free
> +383	common	pkey_mprotect			sys_pkey_mprotect
> +384	common	rseq				sys_rseq
>  # room for arch specific calls
>  393	common	semget				sys_semget
>  394	common	semctl				sys_semctl
> diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h
> index c2c2afb28941..9ec1026af877 100644
> --- a/arch/parisc/include/asm/unistd.h
> +++ b/arch/parisc/include/asm/unistd.h
> @@ -12,9 +12,6 @@
>  
>  #define __IGNORE_select			/* newselect */
>  #define __IGNORE_fadvise64		/* fadvise64_64 */
> -#define __IGNORE_pkey_mprotect
> -#define __IGNORE_pkey_alloc
> -#define __IGNORE_pkey_free
>  
>  #ifndef ASM_LINE_SEP
>  # define ASM_LINE_SEP ;
> diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
> index 9bbd2f9f56c8..e07231de3597 100644
> --- a/arch/parisc/kernel/syscalls/syscall.tbl
> +++ b/arch/parisc/kernel/syscalls/syscall.tbl
> @@ -367,3 +367,7 @@
>  348	common	pwritev2		sys_pwritev2			compat_sys_pwritev2
>  349	common	statx			sys_statx
>  350	common	io_pgetevents		sys_io_pgetevents		compat_sys_io_pgetevents
> +351	common	pkey_alloc		sys_pkey_alloc
> +352	common	pkey_free		sys_pkey_free
> +353	common	pkey_mprotect		sys_pkey_mprotect
> +354	common	rseq			sys_rseq
> diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h
> index a1fbf15d53aa..ed08f114ee91 100644
> --- a/arch/s390/include/asm/unistd.h
> +++ b/arch/s390/include/asm/unistd.h
> @@ -11,9 +11,6 @@
>  #include <asm/unistd_nr.h>
>  
>  #define __IGNORE_time
> -#define __IGNORE_pkey_mprotect
> -#define __IGNORE_pkey_alloc
> -#define __IGNORE_pkey_free
>  
>  #define __ARCH_WANT_NEW_STAT
>  #define __ARCH_WANT_OLD_READDIR
> diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
> index 428cf512a757..f84ea364a302 100644
> --- a/arch/s390/kernel/syscalls/syscall.tbl
> +++ b/arch/s390/kernel/syscalls/syscall.tbl
> @@ -391,6 +391,9 @@
>  381  common	kexec_file_load		sys_kexec_file_load		compat_sys_kexec_file_load
>  382  common	io_pgetevents		sys_io_pgetevents		compat_sys_io_pgetevents
>  383  common	rseq			sys_rseq			compat_sys_rseq
> +384  common	pkey_alloc		sys_pkey_alloc			sys_pkey_alloc
> +385  common	pkey_free		sys_pkey_free			sys_pkey_free
> +386  common	pkey_mprotect		sys_pkey_mprotect		sys_pkey_mprotect
>  # room for arch specific syscalls
>  392	64	semtimedop		sys_semtimedop			-
>  393  common	semget			sys_semget			sys_semget
> diff --git a/arch/sh/kernel/syscalls/syscall.tbl b/arch/sh/kernel/syscalls/syscall.tbl
> index 6d0b84e3ef2d..3f96ad0424e1 100644
> --- a/arch/sh/kernel/syscalls/syscall.tbl
> +++ b/arch/sh/kernel/syscalls/syscall.tbl
> @@ -391,6 +391,10 @@
>  381	common	preadv2				sys_preadv2
>  382	common	pwritev2			sys_pwritev2
>  383	common	statx				sys_statx
> +384	common	pkey_alloc			sys_pkey_alloc
> +385	common	pkey_free			sys_pkey_free
> +386	common	pkey_mprotect			sys_pkey_mprotect
> +387	common	rseq				sys_rseq
>  # room for arch specific syscalls
>  393	common	semget				sys_semget
>  394	common	semctl				sys_semctl
> diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h
> index 5194d86ef72d..08696ea5dca8 100644
> --- a/arch/sparc/include/asm/unistd.h
> +++ b/arch/sparc/include/asm/unistd.h
> @@ -59,9 +59,4 @@
>  #define __IGNORE_getresgid
>  #endif
>  
> -/* Sparc doesn't have protection keys. */
> -#define __IGNORE_pkey_mprotect
> -#define __IGNORE_pkey_alloc
> -#define __IGNORE_pkey_free
> -
>  #endif /* _SPARC_UNISTD_H */
> diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/syscalls/syscall.tbl
> index 8c9580302422..24ebef675184 100644
> --- a/arch/sparc/kernel/syscalls/syscall.tbl
> +++ b/arch/sparc/kernel/syscalls/syscall.tbl
> @@ -407,6 +407,10 @@
>  359	common	pwritev2		sys_pwritev2			compat_sys_pwritev2
>  360	common	statx			sys_statx
>  361	common	io_pgetevents		sys_io_pgetevents		compat_sys_io_pgetevents
> +362	common	pkey_alloc		sys_pkey_alloc
> +363	common	pkey_free		sys_pkey_free
> +364	common	pkey_mprotect		sys_pkey_mprotect
> +365	common	rseq			sys_rseq
>  # room for arch specific syscalls
>  392	64	semtimedop			sys_semtimedop
>  393	common	semget			sys_semget
> diff --git a/arch/xtensa/kernel/syscalls/syscall.tbl b/arch/xtensa/kernel/syscalls/syscall.tbl
> index f8befa11b0c4..c699e014e0dd 100644
> --- a/arch/xtensa/kernel/syscalls/syscall.tbl
> +++ b/arch/xtensa/kernel/syscalls/syscall.tbl
> @@ -372,3 +372,4 @@
>  349	common	pkey_alloc			sys_pkey_alloc
>  350	common	pkey_free			sys_pkey_free
>  351	common	statx				sys_statx
> +352	common	rseq				sys_rseq
> -- 
> 2.20.0
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to speedtest.net: 11.9Mbps down 500kbps up