linux-kernel - [PATCH] arch: xtensa: fix kconfig dependency on FUTEX

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Date:   Sat, 20 Mar 2021 19:33:53 -0400
From:   Julian Braha <julianbraha@...il.com>
To:     chris@...kel.net
Cc:     linux-kernel@...r.kernel.org, linux-xtensa@...ux-xtensa.org
Subject: [PATCH] arch: xtensa: fix kconfig dependency on FUTEX

When HAVE_FUTEX_CMPXCHG is enabled, and FUTEX is disabled,
Kbuild gives the following warning:

WARNING: unmet direct dependencies detected for HAVE_FUTEX_CMPXCHG
  Depends on [n]: FUTEX [=n]
  Selected by [y]:
  - XTENSA [=y] && !MMU [=n]

This is because XTENSA selects HAVE_FUTEX_CMPXCHG,
without selecting or depending on FUTEX, despite
HAVE_FUTEX_CMPXCHG depending on FUTEX.

Signed-off-by: Julian Braha <julianbraha@...il.com>
---
 arch/xtensa/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 9ad6b7b82707..a0d5f065d6b1 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -29,6 +29,7 @@ config XTENSA
 	select HAVE_DMA_CONTIGUOUS
 	select HAVE_EXIT_THREAD
 	select HAVE_FUNCTION_TRACER
+	select FUTEX if !MMU
 	select HAVE_FUTEX_CMPXCHG if !MMU
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
 	select HAVE_IRQ_TIME_ACCOUNTING
-- 
2.25.1