diff options
Diffstat (limited to 'usr/src/uts/common/sys/kmem.h')
| -rw-r--r-- | usr/src/uts/common/sys/kmem.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/kmem.h b/usr/src/uts/common/sys/kmem.h index 3a37f63fa2..03d4d24ba3 100644 --- a/usr/src/uts/common/sys/kmem.h +++ b/usr/src/uts/common/sys/kmem.h @@ -95,6 +95,15 @@ typedef enum kmem_cbrc { #ifdef _KERNEL +/* + * Helps clients implementing the move() callback to recognize known objects by + * testing a client-designated pointer member. Takes advantage of the fact that + * any scribbling to freed memory done by kmem is guaranteed to set one of the + * two low order bits. + */ +#define POINTER_IS_VALID(p) (!((uintptr_t)(p) & 0x3)) +#define POINTER_INVALIDATE(pp) (*(pp) = (void *)((uintptr_t)(*(pp)) | 0x1)) + extern int kmem_ready; extern pgcnt_t kmem_reapahead; |