From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathieu Desnoyers Subject: [PATCH v4 (updated)] getcpu_cache: wire up ARM system call Date: Tue, 23 Feb 2016 20:05:25 -0500 Message-ID: <1456275925-12071-1-git-send-email-mathieu.desnoyers@efficios.com> References: <1456270120-7560-4-git-send-email-mathieu.desnoyers@efficios.com> Return-path: In-Reply-To: <1456270120-7560-4-git-send-email-mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Andrew Morton , Russell King , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Paul Turner , Andrew Hunter , Peter Zijlstra , Andy Lutomirski , Andi Kleen , Dave Watson , Chris Lameter , Ben Maurer , Steven Rostedt , "Paul E. McKenney" , Josh Triplett , Linus Torvalds , Catalin Marinas , Will Deacon , Michael Kerrisk , Mathieu Desnoyers List-Id: linux-api@vger.kernel.org Wire up the getcpu cache system call on 32-bit ARM. This provides an ABI improving the speed of a getcpu operation on ARM by skipping the getcpu system call on the fast path. Signed-off-by: Mathieu Desnoyers CC: Russell King CC: Catalin Marinas CC: Will Deacon CC: Thomas Gleixner CC: Paul Turner CC: Andrew Hunter CC: Peter Zijlstra CC: Andy Lutomirski CC: Andi Kleen CC: Dave Watson CC: Chris Lameter CC: Ingo Molnar CC: Ben Maurer CC: Steven Rostedt CC: "Paul E. McKenney" CC: Josh Triplett CC: Linus Torvalds CC: Andrew Morton CC: linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org --- arch/arm/include/asm/unistd.h | 2 +- arch/arm/include/uapi/asm/unistd.h | 1 + arch/arm/kernel/calls.S | 3 ++- 3 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h index 7b84657..194b699 100644 --- a/arch/arm/include/asm/unistd.h +++ b/arch/arm/include/asm/unistd.h @@ -19,7 +19,7 @@ * This may need to be greater than __NR_last_syscall+1 in order to * account for the padding in the syscall table */ -#define __NR_syscalls (392) +#define __NR_syscalls (396) #define __ARCH_WANT_STAT64 #define __ARCH_WANT_SYS_GETHOSTNAME diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h index 5dd2528..1ad1351 100644 --- a/arch/arm/include/uapi/asm/unistd.h +++ b/arch/arm/include/uapi/asm/unistd.h @@ -418,6 +418,7 @@ #define __NR_membarrier (__NR_SYSCALL_BASE+389) #define __NR_mlock2 (__NR_SYSCALL_BASE+390) #define __NR_copy_file_range (__NR_SYSCALL_BASE+391) +#define __NR_getcpu_cache (__NR_SYSCALL_BASE+392) /* * The following SWIs are ARM private. diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S index dfc7cd6..7e794e9 100644 --- a/arch/arm/kernel/calls.S +++ b/arch/arm/kernel/calls.S @@ -399,8 +399,9 @@ CALL(sys_execveat) CALL(sys_userfaultfd) CALL(sys_membarrier) - CALL(sys_mlock2) +/* 390 */ CALL(sys_mlock2) CALL(sys_copy_file_range) + CALL(sys_getcpu_cache) #ifndef syscalls_counted .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls #define syscalls_counted -- 2.1.4