linux-kernel - [PATCH RFC PKS/PMEM 48/58] drivers/md: Utilize new kmap

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Date:   Fri,  9 Oct 2020 12:50:23 -0700
From:   ira.weiny@...el.com
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ira Weiny <ira.weiny@...el.com>, Coly Li <colyli@...e.de>,
        Kent Overstreet <kent.overstreet@...il.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
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Subject: [PATCH RFC PKS/PMEM 48/58] drivers/md: Utilize new kmap_thread()

From: Ira Weiny <ira.weiny@...el.com>

These kmap() calls are localized to a single thread.  To avoid the over
head of global PKRS updates use the new kmap_thread() call.

Cc: Coly Li <colyli@...e.de> (maintainer:BCACHE (BLOCK LAYER CACHE))
Cc: Kent Overstreet <kent.overstreet@...il.com> (maintainer:BCACHE (BLOCK LAYER CACHE))
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/md/bcache/request.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index c7cadaafa947..a4571f6d09dd 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -44,10 +44,10 @@ static void bio_csum(struct bio *bio, struct bkey *k)
 	uint64_t csum = 0;
 
 	bio_for_each_segment(bv, bio, iter) {
-		void *d = kmap(bv.bv_page) + bv.bv_offset;
+		void *d = kmap_thread(bv.bv_page) + bv.bv_offset;
 
 		csum = bch_crc64_update(csum, d, bv.bv_len);
-		kunmap(bv.bv_page);
+		kunmap_thread(bv.bv_page);
 	}
 
 	k->ptr[KEY_PTRS(k)] = csum & (~0ULL >> 1);
-- 
2.28.0.rc0.12.gb6a658bd00c9