add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/arch/x86/include/asm/preempt.h
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@@ -86,9 +86,24 @@
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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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+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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+}
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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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 }
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 /*
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@@ -96,7 +111,23 @@
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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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+
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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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+	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