x86/asm: Remove thread_info.sysenter_return
authorAndy Lutomirski <luto@kernel.org>
Tue, 6 Oct 2015 00:48:16 +0000 (17:48 -0700)
committerIngo Molnar <mingo@kernel.org>
Fri, 9 Oct 2015 07:41:11 +0000 (09:41 +0200)
commit487e3bf4f77699160aa81a414200060a78a67c3d
tree8f10746d9ec0469cb1f61ab1d21cfb93aac4e5ab
parent5f310f739b4cc343f3f087681e41bbc2f0ce902d
x86/asm: Remove thread_info.sysenter_return

It's no longer needed.

We could reinstate something like it as an optimization, which
would remove two cachelines from the fast syscall entry working
set.  I benchmarked it, and it makes no difference whatsoever to
the performance of cache-hot compat syscalls on Sandy Bridge.

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/f08cc0cff30201afe9bb565c47134c0a6c1a96a2.1444091585.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/thread_info.h
arch/x86/kernel/asm-offsets.c