x86/asm/entry/64: Update comments about stack frames
authorIngo Molnar <mingo@kernel.org>
Tue, 17 Mar 2015 13:42:59 +0000 (14:42 +0100)
committerIngo Molnar <mingo@kernel.org>
Tue, 17 Mar 2015 15:01:41 +0000 (16:01 +0100)
commit7fcb3bc361c724a75bc642dbdd9d9bf0bdf07260
treeb24a2637ac489e3c4f9ee9fd389beecb58a482d7
parentac9af4983e77765a642b5a21086bc1fdc55418c4
x86/asm/entry/64: Update comments about stack frames

Tweak a few outdated comments that were obsoleted by recent changes
to syscall entry code:

 - we no longer have a "partial stack frame" on
   entry, ever.

 - explain the syscall entry usage of old_rsp.

Partially based on a (split out of) patch from Denys Vlasenko.

Originally-from: Denys Vlasenko <dvlasenk@redhat.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.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: Will Drewry <wad@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/entry_64.S