diff options
Diffstat (limited to 'mm/zpool.c')
| -rw-r--r-- | mm/zpool.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/zpool.c b/mm/zpool.c index 68facc193496..f46c0d5e766c 100644 --- a/mm/zpool.c +++ b/mm/zpool.c @@ -387,6 +387,13 @@ bool zpool_evictable(struct zpool *zpool) * zpool_can_sleep_mapped - Test if zpool can sleep when do mapped. * @zpool: The zpool to test * + * Some allocators enter non-preemptible context in ->map() callback (e.g. + * disable pagefaults) and exit that context in ->unmap(), which limits what + * we can do with the mapped object. For instance, we cannot wait for + * asynchronous crypto API to decompress such an object or take mutexes + * since those will call into the scheduler. This function tells us whether + * we use such an allocator. + * * Returns: true if zpool can sleep; false otherwise. */ bool zpool_can_sleep_mapped(struct zpool *zpool) |