linux-kernel - [PATCH RESEND 1/1] lib/Kconfig: remove DEBUG_PER_CPU_MAPS dependency for CPUMASK

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Date:   Tue, 12 Apr 2022 16:15:08 -0700
From:   Libo Chen <libo.chen@...cle.com>
To:     gregkh@...uxfoundation.org, masahiroy@...nel.org,
        tglx@...utronix.de, peterz@...radead.org, mingo@...nel.org,
        vbabka@...e.cz, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org
Subject: [PATCH RESEND 1/1] lib/Kconfig: remove DEBUG_PER_CPU_MAPS dependency for CPUMASK_OFFSTACK

Forcing CPUMASK_OFFSTACK to be conditoned on DEBUG_PER_CPU_MAPS doesn't
make a lot of sense nowaday. Even the original patch dating back to 2008,
aab46da0520a ("cpumask: Add CONFIG_CPUMASK_OFFSTACK") didn't give any
rationale for such dependency.

Nowhere in the code supports the presumption that DEBUG_PER_CPU_MAPS is
necessary for CONFIG_CPUMASK_OFFSTACK. Make no mistake, it's good to
have DEBUG_PER_CPU_MAPS for debugging purpose or precaution, but it's
simply not a hard requirement for CPUMASK_OFFSTACK. Moreover, x86 Kconfig
already can set CPUMASK_OFFSTACK=y without DEBUG_PER_CPU_MAPS=y.
There is no reason other architectures cannot given the fact that they
have even fewer, if any, arch-specific CONFIG_DEBUG_PER_CPU_MAPS code than
x86.

Signed-off-by: Libo Chen <libo.chen@...cle.com>
---
 lib/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 087e06b4cdfd..7209039dfb59 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -511,7 +511,7 @@ config CHECK_SIGNATURE
 	bool

 config CPUMASK_OFFSTACK
-	bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
+	bool "Force CPU masks off stack"
 	help
 	  Use dynamic allocation for cpumask_var_t, instead of putting
 	  them on the stack.  This is a bit more expensive, but avoids
-- 
2.27.0