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authorChristoph Hellwig <hch@lst.de>2021-08-24 09:52:16 +0200
committerJens Axboe <axboe@kernel.dk>2021-08-24 06:42:40 -0600
commitc4b2b7d150d2b155b317b3e2f66492c6befab2b5 (patch)
tree3f8ce9e05bbb53ba0edc05da9b0bf0f3e03d20c5 /block/genhd.c
parent539711d7d6fe382a73254cc966602e63242a6fb3 (diff)
block: remove CONFIG_DEBUG_BLOCK_EXT_DEVT
This might have been a neat debug aid when the extended dev_t was added, but that time is long gone. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210824075216.1179406-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c43
1 files changed, 4 insertions, 39 deletions
diff --git a/block/genhd.c b/block/genhd.c
index f13b7eb0238b..6a5b65c86c4b 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -313,54 +313,19 @@ void unregister_blkdev(unsigned int major, const char *name)
EXPORT_SYMBOL(unregister_blkdev);
-/**
- * blk_mangle_minor - scatter minor numbers apart
- * @minor: minor number to mangle
- *
- * Scatter consecutively allocated @minor number apart if MANGLE_DEVT
- * is enabled. Mangling twice gives the original value.
- *
- * RETURNS:
- * Mangled value.
- *
- * CONTEXT:
- * Don't care.
- */
-static int blk_mangle_minor(int minor)
-{
-#ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT
- int i;
-
- for (i = 0; i < MINORBITS / 2; i++) {
- int low = minor & (1 << i);
- int high = minor & (1 << (MINORBITS - 1 - i));
- int distance = MINORBITS - 1 - 2 * i;
-
- minor ^= low | high; /* clear both bits */
- low <<= distance; /* swap the positions */
- high >>= distance;
- minor |= low | high; /* and set */
- }
-#endif
- return minor;
-}
-
int blk_alloc_ext_minor(void)
{
int idx;
idx = ida_alloc_range(&ext_devt_ida, 0, NR_EXT_DEVT, GFP_KERNEL);
- if (idx < 0) {
- if (idx == -ENOSPC)
- return -EBUSY;
- return idx;
- }
- return blk_mangle_minor(idx);
+ if (idx == -ENOSPC)
+ return -EBUSY;
+ return idx;
}
void blk_free_ext_minor(unsigned int minor)
{
- ida_free(&ext_devt_ida, blk_mangle_minor(minor));
+ ida_free(&ext_devt_ida, minor);
}
static char *bdevt_str(dev_t devt, char *buf)