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: NAndy 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.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
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