linux-kernel - [PATCH 13/17] drivers/target: Convert to mem*

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Message-Id: <20201124060755.1405602-14-ira.weiny@intel.com>
Date:   Mon, 23 Nov 2020 22:07:51 -0800
From:   ira.weiny@...el.com
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Eric Biggers <ebiggers@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Howells <dhowells@...hat.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Steve French <sfrench@...ba.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>,
        Nicolas Pitre <nico@...xnic.net>,
        Brian King <brking@...ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 13/17] drivers/target: Convert to mem*_page()

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

Remove the kmap/mem*()/kunmap patter and use the new mem*_page()
functions.

Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/target/target_core_rd.c        |  6 ++----
 drivers/target/target_core_transport.c | 10 +++-------
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index bf936bbeccfe..30bf0fcae519 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -18,6 +18,7 @@
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/pagemap.h>
 #include <scsi/scsi_proto.h>
 
 #include <target/target_core_base.h>
@@ -117,7 +118,6 @@ static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *
 				sizeof(struct scatterlist));
 	struct page *pg;
 	struct scatterlist *sg;
-	unsigned char *p;
 
 	while (total_sg_needed) {
 		unsigned int chain_entry = 0;
@@ -159,9 +159,7 @@ static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *
 			sg_assign_page(&sg[j], pg);
 			sg[j].length = PAGE_SIZE;
 
-			p = kmap(pg);
-			memset(p, init_payload, PAGE_SIZE);
-			kunmap(pg);
+			memset_page(pg, init_payload, 0, PAGE_SIZE);
 		}
 
 		page_offset += sg_per_table;
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index ff26ab0a5f60..4fec5c728344 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -22,6 +22,7 @@
 #include <linux/module.h>
 #include <linux/ratelimit.h>
 #include <linux/vmalloc.h>
+#include <linux/pagemap.h>
 #include <asm/unaligned.h>
 #include <net/sock.h>
 #include <net/tcp.h>
@@ -1689,15 +1690,10 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess
 		 */
 		if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
 		     se_cmd->data_direction == DMA_FROM_DEVICE) {
-			unsigned char *buf = NULL;
 
 			if (sgl)
-				buf = kmap(sg_page(sgl)) + sgl->offset;
-
-			if (buf) {
-				memset(buf, 0, sgl->length);
-				kunmap(sg_page(sgl));
-			}
+				memzero_page(sg_page(sgl), sgl->offset,
+					     sgl->length);
 		}
 
 		rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
-- 
2.28.0.rc0.12.gb6a658bd00c9