linux-kernel - [PATCH RFC PKS/PMEM 31/58] fs/vboxsf: Utilize new kmap

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Message-Id: <20201009195033.3208459-32-ira.weiny@intel.com>
Date:   Fri,  9 Oct 2020 12:50:06 -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>,
        Hans de Goede <hdegoede@...hat.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 31/58] fs/vboxsf: 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: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/vboxsf/file.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c
index c4ab5996d97a..d9c7e6b7b4cc 100644
--- a/fs/vboxsf/file.c
+++ b/fs/vboxsf/file.c
@@ -216,7 +216,7 @@ static int vboxsf_readpage(struct file *file, struct page *page)
 	u8 *buf;
 	int err;
 
-	buf = kmap(page);
+	buf = kmap_thread(page);
 
 	err = vboxsf_read(sf_handle->root, sf_handle->handle, off, &nread, buf);
 	if (err == 0) {
@@ -227,7 +227,7 @@ static int vboxsf_readpage(struct file *file, struct page *page)
 		SetPageError(page);
 	}
 
-	kunmap(page);
+	kunmap_thread(page);
 	unlock_page(page);
 	return err;
 }
@@ -268,10 +268,10 @@ static int vboxsf_writepage(struct page *page, struct writeback_control *wbc)
 	if (!sf_handle)
 		return -EBADF;
 
-	buf = kmap(page);
+	buf = kmap_thread(page);
 	err = vboxsf_write(sf_handle->root, sf_handle->handle,
 			   off, &nwrite, buf);
-	kunmap(page);
+	kunmap_thread(page);
 
 	kref_put(&sf_handle->refcount, vboxsf_handle_release);
 
@@ -302,10 +302,10 @@ static int vboxsf_write_end(struct file *file, struct address_space *mapping,
 	if (!PageUptodate(page) && copied < len)
 		zero_user(page, from + copied, len - copied);
 
-	buf = kmap(page);
+	buf = kmap_thread(page);
 	err = vboxsf_write(sf_handle->root, sf_handle->handle,
 			   pos, &nwritten, buf + from);
-	kunmap(page);
+	kunmap_thread(page);
 
 	if (err) {
 		nwritten = 0;
-- 
2.28.0.rc0.12.gb6a658bd00c9