diff options
| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-02-27 01:40:29 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-05 00:50:50 +0300 |
| commit | 0d55083698ed2f498e5682c5c252e6b7224890be (patch) | |
| tree | fc378292acdd5370eb2643b73574a76176031860 | |
| parent | e90e147cbc0cbc8dcf48000e15190badf75250f4 (diff) | |
| download | linux-0d55083698ed2f498e5682c5c252e6b7224890be.tar.xz | |
x86/asm/entry/64: Shrink code in 'paranoid_exit'
RESTORE_EXTRA_REGS + RESTORE_C_REGS looks small, but it's
a lot of instructions (fourteen). Let's reuse them.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
[ Cleaned up the labels. ]
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
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: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1421272101-16847-2-git-send-email-dvlasenk@redhat.com
Link: http://lkml.kernel.org/r/59d71848cee3ec9eb48c0252e602efd6bd560e3c.1424989793.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 695f4d434a84..8fafed9f462d 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1285,15 +1285,13 @@ ENTRY(paranoid_exit) DISABLE_INTERRUPTS(CLBR_NONE) TRACE_IRQS_OFF_DEBUG testl %ebx,%ebx /* swapgs needed? */ - jnz paranoid_restore + jnz paranoid_exit_no_swapgs TRACE_IRQS_IRETQ 0 SWAPGS_UNSAFE_STACK - RESTORE_EXTRA_REGS - RESTORE_C_REGS - REMOVE_PT_GPREGS_FROM_STACK 8 - INTERRUPT_RETURN -paranoid_restore: + jmp paranoid_exit_restore +paranoid_exit_no_swapgs: TRACE_IRQS_IRETQ_DEBUG 0 +paranoid_exit_restore: RESTORE_EXTRA_REGS RESTORE_C_REGS REMOVE_PT_GPREGS_FROM_STACK 8 |