From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/arch/x86/include/asm/fpu/api.h | 24 ++++--------------------
1 files changed, 4 insertions(+), 20 deletions(-)
diff --git a/kernel/arch/x86/include/asm/fpu/api.h b/kernel/arch/x86/include/asm/fpu/api.h
index d31b088..8b9bfaa 100644
--- a/kernel/arch/x86/include/asm/fpu/api.h
+++ b/kernel/arch/x86/include/asm/fpu/api.h
@@ -28,7 +28,6 @@
extern void kernel_fpu_end(void);
extern bool irq_fpu_usable(void);
extern void fpregs_mark_activate(void);
-extern void kernel_fpu_resched(void);
/* Code that is unaware of kernel_fpu_begin_mask() can use this */
static inline void kernel_fpu_begin(void)
@@ -41,32 +40,17 @@
* A context switch will (and softirq might) save CPU's FPU registers to
* fpu->state and set TIF_NEED_FPU_LOAD leaving CPU's FPU registers in
* a random state.
- *
- * local_bh_disable() protects against both preemption and soft interrupts
- * on !RT kernels.
- *
- * On RT kernels local_bh_disable() is not sufficient because it only
- * serializes soft interrupt related sections via a local lock, but stays
- * preemptible. Disabling preemption is the right choice here as bottom
- * half processing is always in thread context on RT kernels so it
- * implicitly prevents bottom half processing as well.
- *
- * Disabling preemption also serializes against kernel_fpu_begin().
*/
static inline void fpregs_lock(void)
{
- if (!IS_ENABLED(CONFIG_PREEMPT_RT))
- local_bh_disable();
- else
- preempt_disable();
+ preempt_disable();
+ local_bh_disable();
}
static inline void fpregs_unlock(void)
{
- if (!IS_ENABLED(CONFIG_PREEMPT_RT))
- local_bh_enable();
- else
- preempt_enable();
+ local_bh_enable();
+ preempt_enable();
}
#ifdef CONFIG_X86_DEBUG_FPU
--
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