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| author | Peter Zijlstra <peterz@infradead.org> | 2020-05-30 00:27:36 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 16:15:22 +0300 |
| commit | 84b6a3491567a540f955e18d8e615493afa36df0 (patch) | |
| tree | 6cb78ccb03028398a87ffff420648ed4637c1488 /arch/x86/include/asm/desc.h | |
| parent | cd840e424f27fcc1ae8d14b7ec3ec4560ee6561a (diff) | |
| download | linux-84b6a3491567a540f955e18d8e615493afa36df0.tar.xz | |
x86/entry: Optimize local_db_save() for virt
Because DRn access is 'difficult' with virt; but the DR7 read is cheaper
than a cacheline miss on native, add a virt specific fast path to
local_db_save(), such that when breakpoints are not in use to avoid
touching DRn entirely.
Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200529213321.187833200@infradead.org
Diffstat (limited to 'arch/x86/include/asm/desc.h')
0 files changed, 0 insertions, 0 deletions