From f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 04 Dec 2023 07:10:27 +0000
Subject: [PATCH] add gpio

---
 kernel/arch/x86/include/asm/signal.h |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/kernel/arch/x86/include/asm/signal.h b/kernel/arch/x86/include/asm/signal.h
index 33d3c88..c00e27a 100644
--- a/kernel/arch/x86/include/asm/signal.h
+++ b/kernel/arch/x86/include/asm/signal.h
@@ -28,6 +28,19 @@
 #define SA_IA32_ABI	0x02000000u
 #define SA_X32_ABI	0x01000000u
 
+/*
+ * Because some traps use the IST stack, we must keep preemption
+ * disabled while calling do_trap(), but do_trap() may call
+ * force_sig_info() which will grab the signal spin_locks for the
+ * task, which in PREEMPT_RT_FULL are mutexes.  By defining
+ * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set
+ * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the
+ * trap.
+ */
+#if defined(CONFIG_PREEMPT_RT_FULL)
+#define ARCH_RT_DELAYS_SIGNAL_SEND
+#endif
+
 #ifndef CONFIG_COMPAT
 typedef sigset_t compat_sigset_t;
 #endif

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