linux-kernel - [PATCH RFC PKS/PMEM 20/58] fs/jffs2: Utilize new kmap

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Date:   Fri,  9 Oct 2020 12:49:55 -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>,
        David Woodhouse <dwmw2@...radead.org>,
        Richard Weinberger <richard@....at>, 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,
        linux-kselftest@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
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Subject: [PATCH RFC PKS/PMEM 20/58] fs/jffs2: Utilize new kmap_thread()

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

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

Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Richard Weinberger <richard@....at>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/jffs2/file.c | 4 ++--
 fs/jffs2/gc.c   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index f8fb89b10227..3e6d54f9b011 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -88,7 +88,7 @@ static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg)
 
 	BUG_ON(!PageLocked(pg));
 
-	pg_buf = kmap(pg);
+	pg_buf = kmap_thread(pg);
 	/* FIXME: Can kmap fail? */
 
 	ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_SHIFT,
@@ -103,7 +103,7 @@ static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg)
 	}
 
 	flush_dcache_page(pg);
-	kunmap(pg);
+	kunmap_thread(pg);
 
 	jffs2_dbg(2, "readpage finished\n");
 	return ret;
diff --git a/fs/jffs2/gc.c b/fs/jffs2/gc.c
index 373b3b7c9f44..a7259783ab84 100644
--- a/fs/jffs2/gc.c
+++ b/fs/jffs2/gc.c
@@ -1335,7 +1335,7 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 		return PTR_ERR(page);
 	}
 
-	pg_ptr = kmap(page);
+	pg_ptr = kmap_thread(page);
 	mutex_lock(&f->sem);
 
 	offset = start;
@@ -1400,7 +1400,7 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 		}
 	}
 
-	kunmap(page);
+	kunmap_thread(page);
 	put_page(page);
 	return ret;
 }
-- 
2.28.0.rc0.12.gb6a658bd00c9