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Message-Id: <20211104225226.5031-4-chang.seok.bae@intel.com>
Date: Thu, 4 Nov 2021 15:52:25 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, tglx@...utronix.de, dave.hansen@...ux.intel.com,
peterz@...radead.org, bp@...en8.de, mingo@...hat.com,
chang.seok.bae@...el.com
Subject: [PATCH 3/4] x86/fpu: Prepare AMX state for CPU idle
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@...ux.intel.com>
Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.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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