kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/x86/include/asm/preempt.h
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@@ -89,24 +89,9 @@
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  * a decrement which hits zero means we have no preempt_count and should
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  * reschedule.
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  */
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-static __always_inline bool ____preempt_count_dec_and_test(void)
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-{
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-	return GEN_UNARY_RMWcc("decl", __preempt_count, e, __percpu_arg([var]));
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-}
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-
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 static __always_inline bool __preempt_count_dec_and_test(void)
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 {
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-	if (____preempt_count_dec_and_test())
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-		return true;
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-#ifdef CONFIG_PREEMPT_LAZY
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-	if (preempt_count())
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-		return false;
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-	if (current_thread_info()->preempt_lazy_count)
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-		return false;
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-	return test_thread_flag(TIF_NEED_RESCHED_LAZY);
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-#else
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-	return false;
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-#endif
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+	return GEN_UNARY_RMWcc("decl", __preempt_count, e, __percpu_arg([var]));
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 }
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 /*
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@@ -114,29 +99,10 @@
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  */
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 static __always_inline bool should_resched(int preempt_offset)
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 {
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-#ifdef CONFIG_PREEMPT_LAZY
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-	u32 tmp;
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-	tmp = raw_cpu_read_4(__preempt_count);
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-	if (tmp == preempt_offset)
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-		return true;
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-
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-	/* preempt count == 0 ? */
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-	tmp &= ~PREEMPT_NEED_RESCHED;
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-	if (tmp != preempt_offset)
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-		return false;
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-	/* XXX PREEMPT_LOCK_OFFSET */
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-	if (current_thread_info()->preempt_lazy_count)
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-		return false;
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-	return test_thread_flag(TIF_NEED_RESCHED_LAZY);
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-#else
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 	return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
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-#endif
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 }
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 #ifdef CONFIG_PREEMPTION
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-#ifdef CONFIG_PREEMPT_RT
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-  extern void preempt_schedule_lock(void);
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-#endif
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   extern asmlinkage void preempt_schedule_thunk(void);
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 # define __preempt_schedule() \
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 	asm volatile ("call preempt_schedule_thunk" : ASM_CALL_CONSTRAINT)