linux-kernel - [PATCH] net: marvell: mvpp2: Fix the computation of shared CPUs

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Message-Id: <1093499694f6b375617197eae87db2083a17aaf4.1638222729.git.christophe.jaillet@wanadoo.fr>
Date:   Mon, 29 Nov 2021 22:53:27 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     mw@...ihalf.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, atenart@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] net: marvell: mvpp2: Fix the computation of shared CPUs

'bitmap_fill()' fills a bitmap one 'long' at a time.
It is likely that an exact number of bits is expected.

Use 'bitmap_set()' instead in order not to set unexpected bits.

Fixes: e531f76757eb ("net: mvpp2: handle cases where more CPUs are available than s/w threads")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Having extra bits set looks harmless to me, but would require some
unneeded locking.
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index a48e804c46f2..252e215a14f1 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -7454,7 +7454,7 @@ static int mvpp2_probe(struct platform_device *pdev)
 
 	shared = num_present_cpus() - priv->nthreads;
 	if (shared > 0)
-		bitmap_fill(&priv->lock_map,
+		bitmap_set(&priv->lock_map, 0,
 			    min_t(int, shared, MVPP2_MAX_THREADS));
 
 	for (i = 0; i < MVPP2_MAX_THREADS; i++) {
-- 
2.30.2