linux-kernel - [PATCH RFC PKS/PMEM 30/58] fs/romfs: Utilize new kmap

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Date:   Fri,  9 Oct 2020 12:50:05 -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>, 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 30/58] fs/romfs: 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.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/romfs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index e582d001f792..9050074c6755 100644
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -107,7 +107,7 @@ static int romfs_readpage(struct file *file, struct page *page)
 	void *buf;
 	int ret;
 
-	buf = kmap(page);
+	buf = kmap_thread(page);
 	if (!buf)
 		return -ENOMEM;
 
@@ -136,7 +136,7 @@ static int romfs_readpage(struct file *file, struct page *page)
 		SetPageUptodate(page);
 
 	flush_dcache_page(page);
-	kunmap(page);
+	kunmap_thread(page);
 	unlock_page(page);
 	return ret;
 }
-- 
2.28.0.rc0.12.gb6a658bd00c9