linux-kernel - [PATCH 5.4 129/183] mtd: maps: physmap-core: fix flash size larger than 32-bit

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Message-ID: <20240324234638.1355609-130-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:45:42 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Baruch Siach <baruch@...s.co.il>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 129/183] mtd: maps: physmap-core: fix flash size larger than 32-bit

From: Baruch Siach <baruch@...s.co.il>

[ Upstream commit 3884f03edd34887514a0865a80769cd5362d5c3b ]

mtd-ram can potentially be larger than 4GB. get_bitmask_order() uses
fls() that is not guaranteed to work with values larger than 32-bit.
Specifically on aarch64 fls() returns 0 when all 32 LSB bits are clear.
Use fls64() instead.

Fixes: ba32ce95cbd987 ("mtd: maps: Merge gpio-addr-flash.c into physmap-core.c")
Signed-off-by: Baruch Siach <baruch@...s.co.il>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Link: https://lore.kernel.org/linux-mtd/9fbf3664ce00f8b07867f1011834015f21d162a5.1707388458.git.baruch@tkos.co.il
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mtd/maps/physmap-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
index e4f72b2df8039..fa7e1c0b70c64 100644
--- a/drivers/mtd/maps/physmap-core.c
+++ b/drivers/mtd/maps/physmap-core.c
@@ -505,7 +505,7 @@ static int physmap_flash_probe(struct platform_device *dev)
 		if (!info->maps[i].phys)
 			info->maps[i].phys = res->start;
 
-		info->win_order = get_bitmask_order(resource_size(res)) - 1;
+		info->win_order = fls64(resource_size(res)) - 1;
 		info->maps[i].size = BIT(info->win_order +
 					 (info->gpios ?
 					  info->gpios->ndescs : 0));
-- 
2.43.0