netdev - [PATCH] intel: igb: igb_ethtool.c: Convert kmap() to kmap_local

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Date:   Fri, 15 Apr 2022 22:53:07 +0200
From:   Alaa Mohamed <eng.alaamohamedsoliman.am@...il.com>
To:     outreachy@...ts.linux.dev
Cc:     jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ira.weiny@...el.com,
        eng.alaamohamedsoliman.am@...il.com
Subject: [PATCH] intel: igb: igb_ethtool.c: Convert kmap() to kmap_local_page()

The use of kmap() is being deprecated in favor of kmap_local_page()
where it is feasible.

With kmap_local_page(), the mapping is per thread, CPU local and not
globally visible.

Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@...il.com>
---
 drivers/net/ethernet/intel/igb/igb_ethtool.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c
index 2a5782063f4c..ba93aa4ae6a0 100644
--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -1798,14 +1798,14 @@ static int igb_check_lbtest_frame(struct igb_rx_buffer *rx_buffer,
 
 	frame_size >>= 1;
 
-	data = kmap(rx_buffer->page);
+	data = kmap_local_page(rx_buffer->page);
 
 	if (data[3] != 0xFF ||
 	    data[frame_size + 10] != 0xBE ||
 	    data[frame_size + 12] != 0xAF)
 		match = false;
 
-	kunmap(rx_buffer->page);
+	kunmap_local(rx_buffer->page);
 
 	return match;
 }
-- 
2.35.2