diff options
| author | Andy Lutomirski <luto@kernel.org> | 2017-11-02 10:59:14 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-11-02 13:04:47 +0300 |
| commit | 46f5a10a721ce8dce8cc8fe55279b49e1c6b3288 (patch) | |
| tree | 4e6ca348b4ec0a7033f268399a1df3cb44b58c6b /arch/x86/include/asm/switch_to.h | |
| parent | 20bb83443ea79087b5e5f8dab4e9d80bb9bf7acb (diff) | |
| download | linux-46f5a10a721ce8dce8cc8fe55279b49e1c6b3288.tar.xz | |
x86/entry/64: Remove all remaining direct thread_struct::sp0 reads
The only remaining readers in context switch code or vm86(), and
they all just want to update TSS.sp0 to match the current task.
Replace them all with a new helper update_sp0().
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bpetkov@suse.de>
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/2d231687f4ff288c9d9e98d7861b7df374246ac3.1509609304.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/switch_to.h')
| -rw-r--r-- | arch/x86/include/asm/switch_to.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/switch_to.h b/arch/x86/include/asm/switch_to.h index 7ae8caffbada..54e64d909725 100644 --- a/arch/x86/include/asm/switch_to.h +++ b/arch/x86/include/asm/switch_to.h @@ -84,4 +84,10 @@ static inline void refresh_sysenter_cs(struct thread_struct *thread) } #endif +/* This is used when switching tasks or entering/exiting vm86 mode. */ +static inline void update_sp0(struct task_struct *task) +{ + load_sp0(task->thread.sp0); +} + #endif /* _ASM_X86_SWITCH_TO_H */ |