x86/entry/64: Use PUSH_AND_CLEAN_REGS in more cases
authorDominik Brodowski <linux@dominikbrodowski.net>
Sun, 11 Feb 2018 10:49:46 +0000 (11:49 +0100)
committerIngo Molnar <mingo@kernel.org>
Tue, 13 Feb 2018 08:04:53 +0000 (09:04 +0100)
commit30907fd13bb593202574bb20af58d67c70a1ee14
tree3fb9d19359165ce62748a0ef61d07d4077fb7a4c
parent3f01daecd545e818098d84fd1ad43e19a508d705
x86/entry/64: Use PUSH_AND_CLEAN_REGS in more cases

entry_SYSCALL_64_after_hwframe() and nmi() can be converted to use
PUSH_AND_CLEAN_REGS instead of opencoded variants thereof. Due to
the interleaving, the additional XOR-based clearing of R8 and R9
in entry_SYSCALL_64_after_hwframe() should not have any noticeable
negative implications.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Andy Lutomirski <luto@kernel.org>
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: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dan.j.williams@intel.com
Link: http://lkml.kernel.org/r/20180211104949.12992-6-linux@dominikbrodowski.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/entry/calling.h
arch/x86/entry/entry_64.S