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 <[email protected]> CC: Russell King <[email protected]> CC: Catalin Marinas <[email protected]> CC: Will Deacon <[email protected]> CC: Thomas Gleixner <[email protected]> CC: Paul Turner <[email protected]> CC: Andrew Hunter <[email protected]> CC: Peter Zijlstra <[email protected]> CC: Andy Lutomirski <[email protected]> CC: Andi Kleen <[email protected]> CC: Dave Watson <[email protected]> CC: Chris Lameter <[email protected]> CC: Ingo Molnar <[email protected]> CC: Ben Maurer <[email protected]> CC: Steven Rostedt <[email protected]> CC: "Paul E. McKenney" <[email protected]> CC: Josh Triplett <[email protected]> CC: Linus Torvalds <[email protected]> CC: Andrew Morton <[email protected]> CC: [email protected] --- arch/arm/include/uapi/asm/unistd.h | 1 + arch/arm/kernel/calls.S | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) 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
