From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 6 Nov 2012 18:28:21 +0000 (-0500)
Subject: new helper: sigsp()
X-Git-Tag: v3.9-rc1~98^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5a1b98d3096f1d780045f9be812335ad77aed93d;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

new helper: sigsp()

Normal logics for altstack handling in sigframe allocation

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6fc8f45..8f98329 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
  */