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Subject[PATCH] LoongArch: signal.c: add header file to fix build error
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loongarch's signal.c uses rseq_signal_deliver() so it should
pull in the appropriate header to prevent a build error:

../arch/loongarch/kernel/signal.c: In function 'handle_signal':
../arch/loongarch/kernel/signal.c:1034:9: error: implicit declaration of function 'rseq_signal_deliver' [-Werror=implicit-function-declaration]
1034 | rseq_signal_deliver(ksig, regs);
| ^~~~~~~~~~~~~~~~~~~

Fixes: b74baf4ad05b ("LoongArch: Add signal handling support")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
M: Huacai Chen <chenhuacai@kernel.org>
R: WANG Xuerui <kernel@xen0n.name>
L: loongarch@lists.linux.dev

---
arch/loongarch/kernel/signal.c | 1 +
1 file changed, 1 insertion(+)

diff -- a/arch/loongarch/kernel/signal.c b/arch/loongarch/kernel/signal.c
--- a/arch/loongarch/kernel/signal.c
+++ b/arch/loongarch/kernel/signal.c
@@ -15,6 +15,7 @@
#include <linux/context_tracking.h>
#include <linux/entry-common.h>
#include <linux/irqflags.h>
+#include <linux/rseq.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/personality.h>
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