x86/asm/entry/64: Use common code for rt_sigreturn() epilogue
authorDenys Vlasenko <dvlasenk@redhat.com>
Tue, 7 Apr 2015 20:43:37 +0000 (22:43 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 9 Apr 2015 08:31:24 +0000 (10:31 +0200)
commit31f0119b817f6474a7b4c48fed7588af1b62c543
tree9cabd0a1349b0852b56421d68b62c00d493654fa
parent8b3607b5b8c591d8bf045911cb7c90ecaa6e7b73
x86/asm/entry/64: Use common code for rt_sigreturn() epilogue

Similarly to stub_execve, we can reuse the epilogue in
stub_rt_sigreturn() and stub_x32_rt_sigreturn().

Add a comment explaining why we can't eliminage SAVE_EXTRA_REGS
here.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1428439424-7258-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/entry_64.S