Commit 1e4c4f61 authored Nov 02, 2017 by Borislav Petkov Committed by Ingo Molnar Nov 02, 2017

x86/entry/64: Shorten TEST instructions



Convert TESTL to TESTB and save 3 bytes per callsite.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171102120926.4srwerqrr7g72e2k@pd.tnic


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 3383642c

arch/x86/entry/entry_64.S

+2 −2

Original line number	Diff line number	Diff line
		@@ -620,7 +620,7 @@ GLOBAL(retint_user)
		GLOBAL(swapgs_restore_regs_and_return_to_usermode)
		#ifdef CONFIG_DEBUG_ENTRY
		/* Assert that pt_regs indicates user mode. */
		testl $3, CS(%rsp)
		testb $3, CS(%rsp)
		jnz 1f
		ud2
		1:
		@@ -653,7 +653,7 @@ retint_kernel:
		GLOBAL(restore_regs_and_return_to_kernel)
		#ifdef CONFIG_DEBUG_ENTRY
		/* Assert that pt_regs indicates kernel mode. */
		testl $3, CS(%rsp)
		testb $3, CS(%rsp)
		jz 1f
		ud2
		1: