add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/arch/x86/include/asm/signal.h
..
..
@@ -28,6 +28,19 @@
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 #define SA_IA32_ABI	0x02000000u
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 #define SA_X32_ABI	0x01000000u
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+/*
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+ * Because some traps use the IST stack, we must keep preemption
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+ * disabled while calling do_trap(), but do_trap() may call
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+ * force_sig_info() which will grab the signal spin_locks for the
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+ * task, which in PREEMPT_RT_FULL are mutexes.  By defining
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+ * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set
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+ * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the
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+ * trap.
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+ */
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+#if defined(CONFIG_PREEMPT_RT_FULL)
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+#define ARCH_RT_DELAYS_SIGNAL_SEND
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+#endif
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+
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 #ifndef CONFIG_COMPAT
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 typedef sigset_t compat_sigset_t;
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 #endif