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authorAndy Lutomirski <luto@kernel.org>2015-10-05 17:48:20 -0700
committerIngo Molnar <mingo@kernel.org>2015-10-09 09:41:12 +0200
commitc68ca6787bdd6d2df37cf950135aa11e71af358a (patch)
treee4c1c92be7f20cd4dc4b74ed605d494bc4154afb /kernel/torture.c
parent33c52129f45e06d9ce23e1a3d50bf9fd6770748b (diff)
x86/entry: Micro-optimize compat fast syscall arg fetch
We're following a 32-bit pointer, and the uaccess code isn't smart enough to figure out that the access_ok() check isn't needed. This saves about three cycles on a cache-hot fast syscall. 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: 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> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/bdff034e2f23c5eb974c760cf494cb5bddce8f29.1444091585.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/torture.c')
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