diff options
| author | Andy Lutomirski | 2015-07-03 21:44:32 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2015-07-07 10:59:09 +0200 |
| commit | 8c84014f3bbb112d07e73f30a10ac8a3a72f8649 (patch) | |
| tree | 34d46bd23df0ee7d040c571104a41f70da7baf43 /arch/x86/include/asm/traps.h | |
| parent | x86/asm/entry/64: Migrate error and IRQ exit work to C and remove old assembl... (diff) | |
| download | kernel-qcow2-linux-8c84014f3bbb112d07e73f30a10ac8a3a72f8649.tar.gz kernel-qcow2-linux-8c84014f3bbb112d07e73f30a10ac8a3a72f8649.tar.xz kernel-qcow2-linux-8c84014f3bbb112d07e73f30a10ac8a3a72f8649.zip | |
x86/entry: Remove exception_enter() from most trap handlers
On 64-bit kernels, we don't need it any more: we handle context
tracking directly on entry from user mode and exit to user mode.
On 32-bit kernels, we don't support context tracking at all, so
these callbacks had no effect.
Note: this doesn't change do_page_fault(). Before we do that,
we need to make sure that there is no code that can page fault
from kernel mode with CONTEXT_USER. The 32-bit fast system call
stack argument code is the only offender I'm aware of right now.
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: Denys Vlasenko <vda.linux@googlemail.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: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/ae22f4dfebd799c916574089964592be218151f9.1435952415.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/traps.h')
| -rw-r--r-- | arch/x86/include/asm/traps.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h index c5380bea2a36..c3496619740a 100644 --- a/arch/x86/include/asm/traps.h +++ b/arch/x86/include/asm/traps.h @@ -112,8 +112,8 @@ asmlinkage void smp_threshold_interrupt(void); asmlinkage void smp_deferred_error_interrupt(void); #endif -extern enum ctx_state ist_enter(struct pt_regs *regs); -extern void ist_exit(struct pt_regs *regs, enum ctx_state prev_state); +extern void ist_enter(struct pt_regs *regs); +extern void ist_exit(struct pt_regs *regs); extern void ist_begin_non_atomic(struct pt_regs *regs); extern void ist_end_non_atomic(void); |