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new 0a134a73692 arch/Kconfig: Make NCPUS follow SMP_NCPUS in an SMP build.
0a134a73692 is described below
commit 0a134a73692dc72555bd9eb98bcc3b7732464a69
Author: Marco Casaroli <[email protected]>
AuthorDate: Wed Nov 4 11:45:26 2026 +0100
arch/Kconfig: Make NCPUS follow SMP_NCPUS in an SMP build.
NCPUS has a prompt, so a value that is in .config stays there when
SMP_NCPUS changes. Change SMP_NCPUS to 2 on a configured
qemu-armv7a:smp (with menuconfig or kconfig-tweak) and NCPUS stays at 4.
arm_head.S then refers to cpu2_start and cpu3_start, which arm_cpuhead.S
does not define with SMP_NCPUS=2, and the link fails.
An SMP build must have NCPUS equal to SMP_NCPUS, so show the prompt only
when SMP is off. The value then always comes from the default. A build
with SMP off keeps the option, and the value in its .config.
A new configuration from a defconfig is not affected: NCPUS gets its
default from SMP_NCPUS.
Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Marco Casaroli <[email protected]>
---
arch/Kconfig | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index d328a3030cd..80375e8dd7a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1076,12 +1076,12 @@ endif # ARCH_PGPOOL_MAPPING
endif # ARCH_ADDRENV && ARCH_NEED_ADDRENV_MAPPING
config NCPUS
- int "Number of CPUs we will use"
+ int "Number of CPUs we will use" if !SMP
default SMP_NCPUS if SMP
default 1
range 1 32
---help---
- Number of CPUs we will use.
+ Number of CPUs we will use. An SMP build always uses SMP_NCPUS.
config PAGING
bool "On-demand paging"
