diff options
Diffstat (limited to 'qemu-barrier.h')
| -rw-r--r-- | qemu-barrier.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/qemu-barrier.h b/qemu-barrier.h index 7e11197814..1de914e882 100644 --- a/qemu-barrier.h +++ b/qemu-barrier.h @@ -6,6 +6,8 @@ #if defined(__i386__) +#include "qemu-common.h" /* QEMU_GNUC_PREREQ */ + /* * Because of the strongly ordered x86 storage model, wmb() and rmb() are nops * on x86(well, a compiler barrier only). Well, at least as long as @@ -19,7 +21,7 @@ * mfence on 32 bit as well, e.g. if built with -march=pentium-m. * However, on i386, there seem to be known bugs as recently as 4.3. * */ -#if defined(__GNUC__) && __GNUC__ >= 4 && __GNUC_MINOR__ >= 4 +#if QEMU_GNUC_PREREQ(4, 4) #define smp_mb() __sync_synchronize() #else #define smp_mb() asm volatile("lock; addl $0,0(%%esp) " ::: "memory") |