diff options
| -rw-r--r-- | xen/include/asm-x86/config.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h index 23aabeb2b9..35efb1ba63 100644 --- a/xen/include/asm-x86/config.h +++ b/xen/include/asm-x86/config.h @@ -65,8 +65,13 @@ #define barrier() __asm__ __volatile__("": : :"memory") +/* A power-of-two value greater than or equal to number of hypercalls. */ #define NR_hypercalls 32 +#if NR_hypercalls & (NR_hypercalls - 1) +#error "NR_hypercalls must be a power-of-two value" +#endif + #ifndef NDEBUG #define MEMORY_GUARD #ifdef __x86_64__ |