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| author | Dapeng Mi <dapeng1.mi@linux.intel.com> | 2026-08-24 16:27:15 +0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-09-02 13:10:41 +0200 |
| commit | 450d73dc5f9188ade87fe2d2d967cf18e63b280f (patch) | |
| tree | 8258028f56b3dc6f062d027fd4ed818b374805d5 /tools/perf/scripts/python/bin/stackcollapse-report | |
| parent | 03b89c9f202ee75c9997a8421f0e09a5590c3878 (diff) | |
x86/fpu: Add update_fpu_state_and_flag() helper
Add update_fpu_state_and_flag() as suggested by Peter and Dave.
The helper saves user FPU state and then sets TIF_NEED_FPU_LOAD,
ensuring the task FPU state is saved whenever the flag is set.
Subsequent patches will use this guarantee in NMI context by checking
TIF_NEED_FPU_LOAD before retrieving user FPU state from the saved
task FPU state.
Also add barrier() in the host/guest FPU state switch path and move
clearing of fpu->__task_fpstate after switching back to host state. So
fpu->__task_fpstate is always observed as host FPU state when non-NULL.
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20251204154721.GB2619703@noisy.programming.kicks-ass.net/
Link: https://patch.msgid.link/20260824082731.1013973-8-dapeng1.mi@linux.intel.com
Diffstat (limited to 'tools/perf/scripts/python/bin/stackcollapse-report')
0 files changed, 0 insertions, 0 deletions