linux-kernel - [PATCH RFC PKS/PMEM 55/58] samples: Utilize new kmap

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Message-Id: <20201009195033.3208459-56-ira.weiny@intel.com>
Date:   Fri,  9 Oct 2020 12:50:30 -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>,
        Kirti Wankhede <kwankhede@...dia.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
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        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
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Subject: [PATCH RFC PKS/PMEM 55/58] samples: Utilize new kmap_thread()

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

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

Cc: Kirti Wankhede <kwankhede@...dia.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 samples/vfio-mdev/mbochs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 3cc5e5921682..6d95422c0b46 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -479,12 +479,12 @@ static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
 		pos -= MBOCHS_MMIO_BAR_OFFSET;
 		poff = pos & ~PAGE_MASK;
 		pg = __mbochs_get_page(mdev_state, pos >> PAGE_SHIFT);
-		map = kmap(pg);
+		map = kmap_thread(pg);
 		if (is_write)
 			memcpy(map + poff, buf, count);
 		else
 			memcpy(buf, map + poff, count);
-		kunmap(pg);
+		kunmap_thread(pg);
 		put_page(pg);
 
 	} else {
-- 
2.28.0.rc0.12.gb6a658bd00c9