linux-kernel - [PATCH AUTOSEL 4.9 04/11] ARM: 9178/1: fix unmet dependency on BITREVERSE for HAVE_ARCH

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Date:   Wed,  9 Mar 2022 11:27:09 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Julian Braha <julianbraha@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Sasha Levin <sashal@...nel.org>, jarkko@...nel.org,
        deller@....de, dhowells@...hat.com, richard@....at,
        johannes.berg@...el.com, mcroce@...rosoft.com, arnd@...db.de,
        James.Bottomley@...senPartnership.com
Subject: [PATCH AUTOSEL 4.9 04/11] ARM: 9178/1: fix unmet dependency on BITREVERSE for HAVE_ARCH_BITREVERSE

From: Julian Braha <julianbraha@...il.com>

[ Upstream commit 11c57c3ba94da74c3446924260e34e0b1950b5d7 ]

Resending this to properly add it to the patch tracker - thanks for letting
me know, Arnd :)

When ARM is enabled, and BITREVERSE is disabled,
Kbuild gives the following warning:

WARNING: unmet direct dependencies detected for HAVE_ARCH_BITREVERSE
  Depends on [n]: BITREVERSE [=n]
  Selected by [y]:
  - ARM [=y] && (CPU_32v7M [=n] || CPU_32v7 [=y]) && !CPU_32v6 [=n]

This is because ARM selects HAVE_ARCH_BITREVERSE
without selecting BITREVERSE, despite
HAVE_ARCH_BITREVERSE depending on BITREVERSE.

This unmet dependency bug was found by Kismet,
a static analysis tool for Kconfig. Please advise if this
is not the appropriate solution.

Signed-off-by: Julian Braha <julianbraha@...il.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 lib/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 260a80e313b9..600759707ffe 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -16,7 +16,6 @@ config BITREVERSE
 config HAVE_ARCH_BITREVERSE
 	bool
 	default n
-	depends on BITREVERSE
 	help
 	  This option enables the use of hardware bit-reversal instructions on
 	  architectures which support such operations.
-- 
2.34.1