diff options
Diffstat (limited to 'arch/x86/lib/tsc_timer.c')
| -rw-r--r-- | arch/x86/lib/tsc_timer.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/lib/tsc_timer.c b/arch/x86/lib/tsc_timer.c index 7f5ba2ca6f1..0df1af238c1 100644 --- a/arch/x86/lib/tsc_timer.c +++ b/arch/x86/lib/tsc_timer.c @@ -355,7 +355,15 @@ void __udelay(unsigned long usec) stop = now + usec * get_tbclk_mhz(); while ((int64_t)(stop - get_ticks()) > 0) +#if defined(CONFIG_QEMU) && defined(CONFIG_SMP) + /* + * Add a 'pause' instruction on qemu target, + * to give other VCPUs a chance to run. + */ + asm volatile("pause"); +#else ; +#endif } int timer_init(void) |