linux-kernel - [PATCH RFC PKS/PMEM 47/58] drivers/mtd: Utilize new kmap

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Message-Id: <20201009195033.3208459-48-ira.weiny@intel.com>
Date:   Fri,  9 Oct 2020 12:50:22 -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>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...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 47/58] drivers/mtd: 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: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>
Cc: Vignesh Raghavendra <vigneshr@...com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/mtd/mtd_blkdevs.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 0c05f77f9b21..4b18998273fa 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -88,14 +88,14 @@ static blk_status_t do_blktrans_request(struct mtd_blktrans_ops *tr,
 			return BLK_STS_IOERR;
 		return BLK_STS_OK;
 	case REQ_OP_READ:
-		buf = kmap(bio_page(req->bio)) + bio_offset(req->bio);
+		buf = kmap_thread(bio_page(req->bio)) + bio_offset(req->bio);
 		for (; nsect > 0; nsect--, block++, buf += tr->blksize) {
 			if (tr->readsect(dev, block, buf)) {
-				kunmap(bio_page(req->bio));
+				kunmap_thread(bio_page(req->bio));
 				return BLK_STS_IOERR;
 			}
 		}
-		kunmap(bio_page(req->bio));
+		kunmap_thread(bio_page(req->bio));
 		rq_flush_dcache_pages(req);
 		return BLK_STS_OK;
 	case REQ_OP_WRITE:
@@ -103,14 +103,14 @@ static blk_status_t do_blktrans_request(struct mtd_blktrans_ops *tr,
 			return BLK_STS_IOERR;
 
 		rq_flush_dcache_pages(req);
-		buf = kmap(bio_page(req->bio)) + bio_offset(req->bio);
+		buf = kmap_thread(bio_page(req->bio)) + bio_offset(req->bio);
 		for (; nsect > 0; nsect--, block++, buf += tr->blksize) {
 			if (tr->writesect(dev, block, buf)) {
-				kunmap(bio_page(req->bio));
+				kunmap_thread(bio_page(req->bio));
 				return BLK_STS_IOERR;
 			}
 		}
-		kunmap(bio_page(req->bio));
+		kunmap_thread(bio_page(req->bio));
 		return BLK_STS_OK;
 	default:
 		return BLK_STS_IOERR;
-- 
2.28.0.rc0.12.gb6a658bd00c9