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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-10-12 16:11:41 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-10-12 16:13:08 +0200
commit210d3a90ce665509e4852977d7a3352654e5e990 (patch)
treedb757ee80cd43e0c083830f9815a86f3a5a4b89c /include/asm-s390
parentc622498e5c82217cda7f661eebbabdaad0814659 (diff)
downloadop-kernel-dev-210d3a90ce665509e4852977d7a3352654e5e990.zip
op-kernel-dev-210d3a90ce665509e4852977d7a3352654e5e990.tar.gz
[S390] Force link error if xchg/cmpxchg gets called with unsupported size.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'include/asm-s390')
-rw-r--r--include/asm-s390/system.h24
1 files changed, 13 insertions, 11 deletions
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index 64a3cd0..d866d33 100644
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -130,6 +130,8 @@ extern void pfault_fini(void);
__ret; \
})
+extern void __xchg_called_with_bad_pointer(void);
+
static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
{
unsigned long addr, old;
@@ -150,8 +152,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
: "=&d" (old), "=m" (*(int *) addr)
: "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
"m" (*(int *) addr) : "memory", "cc", "0");
- x = old >> shift;
- break;
+ return old >> shift;
case 2:
addr = (unsigned long) ptr;
shift = (2 ^ (addr & 2)) << 3;
@@ -166,8 +167,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
: "=&d" (old), "=m" (*(int *) addr)
: "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
"m" (*(int *) addr) : "memory", "cc", "0");
- x = old >> shift;
- break;
+ return old >> shift;
case 4:
asm volatile(
" l %0,0(%3)\n"
@@ -176,8 +176,7 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
: "=&d" (old), "=m" (*(int *) ptr)
: "d" (x), "a" (ptr), "m" (*(int *) ptr)
: "memory", "cc");
- x = old;
- break;
+ return old;
#ifdef __s390x__
case 8:
asm volatile(
@@ -187,11 +186,11 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
: "=&d" (old), "=m" (*(long *) ptr)
: "d" (x), "a" (ptr), "m" (*(long *) ptr)
: "memory", "cc");
- x = old;
- break;
+ return old;
#endif /* __s390x__ */
- }
- return x;
+ }
+ __xchg_called_with_bad_pointer();
+ return x;
}
/*
@@ -206,6 +205,8 @@ static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
(unsigned long)(n),sizeof(*(ptr))))
+extern void __cmpxchg_called_with_bad_pointer(void);
+
static inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
{
@@ -270,7 +271,8 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
return prev;
#endif /* __s390x__ */
}
- return old;
+ __cmpxchg_called_with_bad_pointer();
+ return old;
}
/*
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