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acrn-hypervisor
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HV: add volatile declaration to pointer parameter 

Add a volatile declaration to pointer parameter to avoid compiler
to optimize it by using old value saved in register instead of
accessing system memory.

Signed-off-by: Zheng, Gen <gen.zheng@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Zheng, Gen 2018-06-13 16:04:46 +08:00 committed by lijinxia
parent 24ccdf2807
commit 8f3b36b224
1 changed files with 5 additions and 5 deletions
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10
hypervisor/include/lib/bits.h
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@ -145,7 +145,7 @@ static inline int clz64(unsigned long value)
* (*addr) |= (1UL<<nr); * (*addr) |= (1UL<<nr);
*/ */
#define build_bitmap_set(name, lock, nr, addr) \ #define build_bitmap_set(name, lock, nr, addr) \
static inline void name(int nr, unsigned long *addr) \ static inline void name(int nr, volatile unsigned long *addr) \
{ \ { \
asm volatile(lock "orq %1,%0" \ asm volatile(lock "orq %1,%0" \
: "+m" (*addr) \ : "+m" (*addr) \
@ -159,7 +159,7 @@ build_bitmap_set(bitmap_set, BUS_LOCK, nr, addr)
* (*addr) &= ~(1UL<<nr); * (*addr) &= ~(1UL<<nr);
*/ */
#define build_bitmap_clear(name, lock, nr, addr) \ #define build_bitmap_clear(name, lock, nr, addr) \
static inline void name(int nr, unsigned long *addr) \ static inline void name(int nr, volatile unsigned long *addr) \
{ \ { \
asm volatile(lock "andq %1,%0" \ asm volatile(lock "andq %1,%0" \
: "+m" (*addr) \ : "+m" (*addr) \
@ -172,7 +172,7 @@ build_bitmap_clear(bitmap_clear, BUS_LOCK, nr, addr)
/* /*
* return !!((*addr) & (1UL<<nr)); * return !!((*addr) & (1UL<<nr));
*/ */
static inline bool bitmap_test(int nr, unsigned long *addr) static inline bool bitmap_test(int nr, volatile unsigned long *addr)
{ {
int ret; int ret;
@ -189,7 +189,7 @@ static inline bool bitmap_test(int nr, unsigned long *addr)
* return ret; * return ret;
*/ */
#define build_bitmap_testandset(name, lock, nr, addr) \ #define build_bitmap_testandset(name, lock, nr, addr) \
static inline bool name(int nr, unsigned long *addr) \ static inline bool name(int nr, volatile unsigned long *addr) \
{ \ { \
int ret; \ int ret; \
asm volatile(lock "btsq %2,%1\n\tsbbl %0,%0" \ asm volatile(lock "btsq %2,%1\n\tsbbl %0,%0" \
@ -207,7 +207,7 @@ build_bitmap_testandset(bitmap_test_and_set, BUS_LOCK, nr, addr)
* return ret; * return ret;
*/ */
#define build_bitmap_testandclear(name, lock, nr, addr) \ #define build_bitmap_testandclear(name, lock, nr, addr) \
static inline bool name(int nr, unsigned long *addr) \ static inline bool name(int nr, volatile unsigned long *addr) \
{ \ { \
int ret; \ int ret; \
asm volatile(lock "btrq %2,%1\n\tsbbl %0,%0" \ asm volatile(lock "btrq %2,%1\n\tsbbl %0,%0" \