linux-kernel - [PATCH v3] cpumask: limit visibility of FORCE_NR

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Date:   Wed, 16 Nov 2022 09:24:51 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Sander Vanheule <sander@...nheule.net>,
        Alexey Klimov <klimov.linux@...il.com>,
        Eric Biggers <ebiggers@...gle.com>
Cc:     Yury Norov <yury.norov@...il.com>
Subject: [PATCH v3] cpumask: limit visibility of FORCE_NR_CPUS

In current form, FORCE_NR_CPUS is visible to all users building their
kernels, even not experts. It is also set in allmodconfig or allyesconfig,
which is not a correct behavior.

This patch fixes it. It also changes the parameter short description:
removes implementation details and highlights the effect of the change. 

Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
v3: instead of 'choice', use !COMPILE_TEST to disable FORCE_NR_CPUS
    in all{yes,mod}config, as suggested by Linus.
 lib/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig b/lib/Kconfig
index 9bbf8a4b2108..404647cd3fac 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -529,8 +529,8 @@ config CPUMASK_OFFSTACK
 	  stack overflow.
 
 config FORCE_NR_CPUS
-       bool "NR_CPUS is set to an actual number of CPUs"
-       depends on SMP
+       bool "Set number of CPUs at compile time"
+       depends on SMP && EXPERT && !COMPILE_TEST
        help
          Say Yes if you have NR_CPUS set to an actual number of possible
          CPUs in your system, not to a default value. This forces the core
-- 
2.34.1