[PATCH] [mmotm v2] comment on swap notify locking constraints
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From: Nitin Gupta on 14 Jan 2010 13:20 A block device makes swap_slot_free_notify() callback when the last reference to a swap slot is dropped. This callback is made under swap_lock and page table lock. This is a note of warning for registered callback function which must meet these constraints. Signed-off-by: Nitin Gupta <ngupta(a)vflare.org> --- include/linux/blkdev.h | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f86df8b..fb7b3c2 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1294,6 +1294,7 @@ struct block_device_operations { unsigned long long); int (*revalidate_disk) (struct gendisk *); int (*getgeo)(struct block_device *, struct hd_geometry *); + /* this callback is with swap_lock and page table lock held */ void (*swap_slot_free_notify) (struct block_device *, unsigned long); struct module *owner; }; -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |