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| author | Andy Lutomirski <luto@kernel.org> | 2015-10-05 17:48:20 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-09 09:41:12 +0200 |
| commit | c68ca6787bdd6d2df37cf950135aa11e71af358a (patch) | |
| tree | e4c1c92be7f20cd4dc4b74ed605d494bc4154afb /Kbuild | |
| parent | 33c52129f45e06d9ce23e1a3d50bf9fd6770748b (diff) | |
| download | linux-c68ca6787bdd6d2df37cf950135aa11e71af358a.tar.gz linux-c68ca6787bdd6d2df37cf950135aa11e71af358a.tar.bz2 linux-c68ca6787bdd6d2df37cf950135aa11e71af358a.zip | |
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 'Kbuild')
0 files changed, 0 insertions, 0 deletions