From 90e5b38a26529391da2d851a9cc5eb9de2ec35ca Mon Sep 17 00:00:00 2001 From: Ihor Solodrai Date: Fri, 19 Dec 2025 10:13:18 -0800 Subject: kbuild: Sync kconfig when PAHOLE_VERSION changes This patch implements kconfig re-sync when the pahole version changes between builds, similar to how it happens for compiler version change via CC_VERSION_TEXT. Define PAHOLE_VERSION in the top-level Makefile and export it for config builds. Set CONFIG_PAHOLE_VERSION default to the exported variable. Kconfig records the PAHOLE_VERSION value in include/config/auto.conf.cmd [1]. The Makefile includes auto.conf.cmd, so if PAHOLE_VERSION changes between builds, make detects a dependency change and triggers syncconfig to update the kconfig [2]. For external module builds, add a warning message in the prepare target, similar to the existing compiler version mismatch warning. Note that if pahole is not installed or available, PAHOLE_VERSION is set to 0 by pahole-version.sh, so the (un)installation of pahole is treated as a version change. See previous discussions for context [3]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/kconfig/preprocess.c?h=v6.18#n91 [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Makefile?h=v6.18#n815 [3] https://lore.kernel.org/bpf/8f946abf-dd88-4fac-8bb4-84fcd8d81cf0@oracle.com/ Signed-off-by: Ihor Solodrai Signed-off-by: Andrii Nakryiko Tested-by: Nicolas Schier Tested-by: Alan Maguire Reviewed-by: Nicolas Schier Link: https://lore.kernel.org/bpf/20251219181321.1283664-6-ihor.solodrai@linux.dev --- init/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'init') diff --git a/init/Kconfig b/init/Kconfig index fa79feb8fe57..317f3c0b13ad 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -171,7 +171,7 @@ config RUSTC_HAS_FILE_AS_C_STR config PAHOLE_VERSION int - default $(shell,$(srctree)/scripts/pahole-version.sh $(PAHOLE)) + default "$(PAHOLE_VERSION)" config CONSTRUCTORS bool -- cgit v1.2.3