kernel-ark/arch/um/include/longjmp.h
Paolo 'Blaisorblade' Giarrusso b5cdb5797d [PATCH] uml: make UML_SETJMP always safe
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@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-11 11:14:20 -07:00

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C

#ifndef __UML_LONGJMP_H
#define __UML_LONGJMP_H
#include "sysdep/archsetjmp.h"
#include "os.h"
extern int setjmp(jmp_buf);
extern void longjmp(jmp_buf, int);
#define UML_LONGJMP(buf, val) do { \
longjmp(*buf, val); \
} while(0)
#define UML_SETJMP(buf) ({ \
int n; \
volatile int enable; \
enable = get_signals(); \
n = setjmp(*buf); \
if(n != 0) \
set_signals(enable); \
n; })
#endif