From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] IB/iser: use sector_div instead of do_div
Date: Fri, 20 Nov 2015 17:41:36 +0100 [thread overview]
Message-ID: <5922990.8IJpyksX8K@wuerfel> (raw)
do_div is the wrong way to divide a sector_t, as it is less
efficient when sector_t is 32-bit wide. With the upcoming
do_div optimizations, the kernel starts warning about this:
drivers/infiniband/ulp/iser/iser_verbs.c:1296:4: note: in expansion of macro 'do_div'
include/asm-generic/div64.h:224:22: warning: passing argument 1 of '__div64_32' from incompatible pointer type
This changes the code to use sector_div instead, which always
produces optimal code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index a93070210109..42f4da620f2e 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -1293,7 +1293,7 @@ u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
sector_t sector_off = mr_status.sig_err.sig_err_offset;
- do_div(sector_off, sector_size + 8);
+ sector_div(sector_off, sector_size + 8);
*sector = scsi_get_lba(iser_task->sc) + sector_off;
pr_err("PI error found type %d at sector %llx "
next reply other threads:[~2015-11-20 16:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-20 16:41 Arnd Bergmann [this message]
2015-11-21 2:18 ` [PATCH] IB/iser: use sector_div instead of do_div Sagi Grimberg
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