[uml-devel] [PATCH 06/14] uml: make UML_SETJMP always safe

[Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>]

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>

If enable is moved by GCC in a register its value may not be preserved after
coming back there with longjmp(). So, mark it as volatile to prevent this; this
is suggested (it seems) in info gcc, when it talks about -Wuninitialized. I
re-read this and it seems to say something different, but I still believe this
may be needed.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
---

 arch/um/include/longjmp.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/um/include/longjmp.h b/arch/um/include/longjmp.h
index e93c6d3..e860bc5 100644
--- a/arch/um/include/longjmp.h
+++ b/arch/um/include/longjmp.h
@@ -12,7 +12,8 @@ #define UML_LONGJMP(buf, val) do { \
 } while(0)
 
 #define UML_SETJMP(buf) ({ \
-	int n, enable;	   \
+	int n;	   \
+	volatile int enable;	\
 	enable = get_signals(); \
 	n = setjmp(*buf); \
 	if(n != 0) \
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