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ARM: 9178/1: fix unmet dependency on BITREVERSE for HAVE_ARCH_BITREVERSE

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[ Upstream commit 11c57c3ba9 ]

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@gmail.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Julian Braha 2022-01-17 05:09:40 +01:00 • committed by Justin Hammond
parent 33826f37c8
commit e8d8583f1c
1 changed files with 0 additions and 1 deletions
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lib/Kconfig
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@ -45,7 +45,6 @@ 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.