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| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-03-30 20:09:34 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-31 09:31:11 +0200 |
| commit | a3675b32aac81c2c4733568844f8276527a37423 (patch) | |
| tree | 508526b94cb09ef9a9bd79ed527cc9aac14cc166 /arch/x86/kernel/entry_64.S | |
| parent | 627276cb55f33e2dc56eab5b973937c128b7704c (diff) | |
| download | blackbird-op-linux-a3675b32aac81c2c4733568844f8276527a37423.tar.gz blackbird-op-linux-a3675b32aac81c2c4733568844f8276527a37423.zip | |
x86/asm/entry/64: Do not GET_THREAD_INFO() too early
At exit_intr, we GET_THREAD_INFO(%rcx) and then jump to
retint_kernel if saved CS was from kernel. But the code at
retint_kernel doesn't need %rcx.
Move GET_THREAD_INFO(%rcx) down, after CS check and branch.
While at it, remove "has a correct top of stack" comment.
After recent changes which eliminated FIXUP_TOP_OF_STACK,
we always have a correct pt_regs layout.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
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: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1427738975-7391-5-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/entry_64.S')
| -rw-r--r-- | arch/x86/kernel/entry_64.S | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 34d60c34fca8..6f251a5ee1dc 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -658,13 +658,12 @@ ret_from_intr: CFI_ADJUST_CFA_OFFSET RBP exit_intr: - GET_THREAD_INFO(%rcx) testl $3,CS(%rsp) je retint_kernel - /* Interrupt came from user space */ + + GET_THREAD_INFO(%rcx) /* - * Has a correct top of stack. * %rcx: thread info. Interrupts off. */ retint_with_reschedule: |
