linux-ext4 - [PATCH RFC PKS/PMEM 26/58] fs/zonefs: Utilize new kmap

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Date:   Fri,  9 Oct 2020 12:50:01 -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>,
        Damien Le Moal <damien.lemoal@....com>,
        Naohiro Aota <naohiro.aota@....com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
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        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
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Subject: [PATCH RFC PKS/PMEM 26/58] fs/zonefs: 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: Damien Le Moal <damien.lemoal@....com>
Cc: Naohiro Aota <naohiro.aota@....com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/zonefs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index 8ec7c8f109d7..2fd6c86beee1 100644
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -1297,7 +1297,7 @@ static int zonefs_read_super(struct super_block *sb)
 	if (ret)
 		goto free_page;
 
-	super = kmap(page);
+	super = kmap_thread(page);
 
 	ret = -EINVAL;
 	if (le32_to_cpu(super->s_magic) != ZONEFS_MAGIC)
@@ -1349,7 +1349,7 @@ static int zonefs_read_super(struct super_block *sb)
 	ret = 0;
 
 unmap:
-	kunmap(page);
+	kunmap_thread(page);
 free_page:
 	__free_page(page);
 
-- 
2.28.0.rc0.12.gb6a658bd00c9