diff options
| author | Andy Lutomirski <luto@kernel.org> | 2016-01-29 02:11:28 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-01-29 11:46:38 +0300 |
| commit | 1e423bff959e48166f5b7efca01fdb0dbdf05846 (patch) | |
| tree | 9bfdea82ed42920fbc2806e51a9a7281324db888 /arch/x86/kernel/hpet.c | |
| parent | 24d978b76ffd20ecff8a8d1c21b16fe740f8b119 (diff) | |
| download | linux-1e423bff959e48166f5b7efca01fdb0dbdf05846.tar.xz | |
x86/entry/64: Migrate the 64-bit syscall slow path to C
This is more complicated than the 32-bit and compat cases
because it preserves an asm fast path for the case where the
callee-saved regs aren't needed in pt_regs and no entry or exit
work needs to be done.
This appears to slow down fastpath syscalls by no more than one
cycle on my Skylake laptop.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/ce2335a4d42dc164b24132ee5e8c7716061f947b.1454022279.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/hpet.c')
0 files changed, 0 insertions, 0 deletions