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authorAndy Lutomirski <luto@kernel.org>2016-03-09 13:24:32 -0800
committerIngo Molnar <mingo@kernel.org>2016-03-10 10:53:26 +0100
commita798f091113ef4999277dbe0483d37d04fa35b2e (patch)
tree25a795b4f3da2670f6b507eecc2f0d54c9b1f741 /arch/x86/kernel/traps.c
parentfda57b2267e12de014069b1596a5438cf76fc7c6 (diff)
downloadlinux-a798f091113ef4999277dbe0483d37d04fa35b2e.tar.bz2
x86/entry/32: Change INT80 to be an interrupt gate
We want all of the syscall entries to run with interrupts off so that we can efficiently run context tracking before enabling interrupts. This will regress int $0x80 performance on 32-bit kernels by a couple of cycles. This shouldn't matter much -- int $0x80 is not a fast path. This effectively reverts: 657c1eea0019 ("x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on") ... and fixes the same issue differently. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/59b4f90c9ebfccd8c937305dbbbca680bc74b905.1457558566.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/traps.c')
-rw-r--r--arch/x86/kernel/traps.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 49e2e775f507..5fae2d840e64 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -912,7 +912,7 @@ void __init trap_init(void)
#endif
#ifdef CONFIG_X86_32
- set_system_trap_gate(IA32_SYSCALL_VECTOR, entry_INT80_32);
+ set_system_intr_gate(IA32_SYSCALL_VECTOR, entry_INT80_32);
set_bit(IA32_SYSCALL_VECTOR, used_vectors);
#endif