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null_blk: use sector_div instead of do_div 

Dividing a sector_t number should be done using sector_div rather than do_div
to optimize the 32-bit sector_t case, and with the latest do_div optimizations,
we now get a compile-time warning for this:

arch/arm/include/asm/div64.h:32:95: note: expected 'uint64_t * {aka long long unsigned int *}' but argument is of type 'sector_t * {aka long unsigned int *}'
drivers/block/null_blk.c:521:81: warning: comparison of distinct pointer types lacks a cast

This changes the newly added code to use sector_div. It is a simplified version
of the original patch, as Linus Torvalds pointed out that we should not be using
an expensive division function in the first place.

This version was suggested by Matias Bjorling.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Matias Bjorling <m@bjorling.me>
Fixes: b2b7e00148 ("null_blk: register as a LightNVM device")
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Arnd Bergmann 2016-01-13 23:04:08 +01:00 committed by Jens Axboe
parent 038a75afc5
commit e93d12ae3b
1 changed files with 4 additions and 4 deletions
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8
drivers/block/null_blk.c
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@ -510,17 +510,17 @@ static int null_lnvm_id(struct request_queue *q, struct nvm_id *id)
id->ppaf.ch_offset = 56;
id->ppaf.ch_len = 8;
do_div(size, bs); /* convert size to pages */
do_div(size, 256); /* concert size to pgs pr blk */
sector_div(size, bs); /* convert size to pages */
size >>= 8; /* concert size to pgs pr blk */
grp = &id->groups[0];
grp->mtype = 0;
grp->fmtype = 0;
grp->num_ch = 1;
grp->num_pg = 256;
blksize = size;
do_div(size, (1 << 16));
size >>= 16;
grp->num_lun = size + 1;
do_div(blksize, grp->num_lun);
sector_div(blksize, grp->num_lun);
grp->num_blk = blksize;
grp->num_pln = 1;