From 5a1b98d3096f1d780045f9be812335ad77aed93d Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 6 Nov 2012 13:28:21 -0500
Subject: [PATCH] new helper: sigsp()
Normal logics for altstack handling in sigframe allocation
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
include/linux/sched.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6fc8f45de4e91..8f983293b403d 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2305,6 +2305,17 @@ static inline int sas_ss_flags(unsigned long sp)
: on_sig_stack(sp) ? SS_ONSTACK : 0);
}
+static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
+{
+ if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
+#ifdef CONFIG_STACK_GROWSUP
+ return current->sas_ss_sp;
+#else
+ return current->sas_ss_sp + current->sas_ss_size;
+#endif
+ return sp;
+}
+
/*
* Routines for handling mm_structs
*/
--
2.39.5