Messages in this thread Patch in this message | | | From | Mathieu Desnoyers <> | Subject | [PATCH v4 5/5] getcpu_cache: wire up x86 32/64 system call | Date | Tue, 23 Feb 2016 18:28:40 -0500 |
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Wire up the getcpu_cache system call on x86 32/64.
This provides an ABI improving the speed of a getcpu operation on x86 by removing the need to perform a function call, "lsl" instruction, or system call on the fast path.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> CC: Thomas Gleixner <tglx@linutronix.de> CC: Paul Turner <pjt@google.com> CC: Andrew Hunter <ahh@google.com> CC: Peter Zijlstra <peterz@infradead.org> CC: Andy Lutomirski <luto@amacapital.net> CC: Andi Kleen <andi@firstfloor.org> CC: Dave Watson <davejwatson@fb.com> CC: Chris Lameter <cl@linux.com> CC: Ingo Molnar <mingo@redhat.com> CC: "H. Peter Anvin" <hpa@zytor.com> CC: Ben Maurer <bmaurer@fb.com> CC: Steven Rostedt <rostedt@goodmis.org> CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> CC: Josh Triplett <josh@joshtriplett.org> CC: Linus Torvalds <torvalds@linux-foundation.org> CC: Andrew Morton <akpm@linux-foundation.org> CC: linux-api@vger.kernel.org --- arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + 2 files changed, 2 insertions(+)
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index cb713df..c2372a7 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -384,3 +384,4 @@ 375 i386 membarrier sys_membarrier 376 i386 mlock2 sys_mlock2 377 i386 copy_file_range sys_copy_file_range +378 i386 getcpu_cache sys_getcpu_cache diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index dc1040a..6b3ffa0 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -333,6 +333,7 @@ 324 common membarrier sys_membarrier 325 common mlock2 sys_mlock2 326 common copy_file_range sys_copy_file_range +326 common getcpu_cache sys_getcpu_cache # # x32-specific system call numbers start at 512 to avoid cache impact -- 2.1.4
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