Messages in this thread Patch in this message | | | From | "Chang S. Bae" <> | Subject | [PATCH v4 4/7] x86/fsgsbase/64: Factor out load FS/GS segments from __switch_to | Date | Wed, 20 Jun 2018 16:15:03 -0700 |
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Instead of open coding the calls to load_seg_legacy(), add a load_fsgs() helper to handle fs and gs. When FSGSBASE is enabled, load_fsgs() will be updated.
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Reviewed-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/kernel/process_64.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index e498671..cebf240 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -279,6 +279,15 @@ static __always_inline void load_seg_legacy(unsigned short prev_index, } } +static __always_inline void load_fsgs(struct thread_struct *prev, + struct thread_struct *next) +{ + load_seg_legacy(prev->fsindex, prev->fsbase, + next->fsindex, next->fsbase, FS); + load_seg_legacy(prev->gsindex, prev->gsbase, + next->gsindex, next->gsbase, GS); +} + static unsigned long task_seg_base(struct task_struct *task, unsigned short selector) { @@ -588,10 +597,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) if (unlikely(next->ds | prev->ds)) loadsegment(ds, next->ds); - load_seg_legacy(prev->fsindex, prev->fsbase, - next->fsindex, next->fsbase, FS); - load_seg_legacy(prev->gsindex, prev->gsbase, - next->gsindex, next->gsbase, GS); + load_fsgs(prev, next); switch_fpu_finish(next_fpu, cpu); -- 2.7.4
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