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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/x86/include/asm/preempt.h
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@@ -8,6 +8,9 @@
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 DECLARE_PER_CPU(int, __preempt_count);
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+/* We use the MSB mostly because its available */
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+#define PREEMPT_NEED_RESCHED	0x80000000
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+
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 /*
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  * We use the PREEMPT_NEED_RESCHED bit as an inverted NEED_RESCHED such
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  * that a decrement hitting 0 means we can and should reschedule.
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@@ -40,7 +43,7 @@
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 #define init_task_preempt_count(p) do { } while (0)
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 #define init_idle_preempt_count(p, cpu) do { \
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-	per_cpu(__preempt_count, (cpu)) = PREEMPT_ENABLED; \
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+	per_cpu(__preempt_count, (cpu)) = PREEMPT_DISABLED; \
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 } while (0)
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 /*
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@@ -86,9 +89,24 @@
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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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-	GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), e);
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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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 }
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 /*
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@@ -96,18 +114,37 @@
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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_PREEMPT
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-  extern asmlinkage void ___preempt_schedule(void);
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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" : ASM_CALL_CONSTRAINT)
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+	asm volatile ("call preempt_schedule_thunk" : ASM_CALL_CONSTRAINT)
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   extern asmlinkage void preempt_schedule(void);
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-  extern asmlinkage void ___preempt_schedule_notrace(void);
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+  extern asmlinkage void preempt_schedule_notrace_thunk(void);
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 # define __preempt_schedule_notrace() \
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-	asm volatile ("call ___preempt_schedule_notrace" : ASM_CALL_CONSTRAINT)
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+	asm volatile ("call preempt_schedule_notrace_thunk" : ASM_CALL_CONSTRAINT)
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   extern asmlinkage void preempt_schedule_notrace(void);
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 #endif