Messages in this thread Patch in this message | | | From | "Chang S. Bae" <> | Subject | [PATCH 3/4] x86/fpu: Prepare AMX state for CPU idle | Date | Thu, 4 Nov 2021 15:52:25 -0700 |
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Before entering CPU idle, make sure large registers such as AMX TILE are initialized. Otherwise, non-initialized register states may prevent a CPU from entering a deeper low-power state.
Suggested-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- arch/x86/kernel/process.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index eb470be0e5ae..7044ba276064 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -707,6 +707,7 @@ static inline void play_dead(void) void arch_cpu_idle_enter(void) { + fpu_idle_fpregs(); tsc_verify_tsc_adjust(false); local_touch_nmi(); } -- 2.17.1
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