This patchset attempts to fix kbuild to automatically remove stale asm-generic wrappers, i.e. when files are removed from generic-y and added directly into arch/*/include/uapi/asm/, but where the existing wrapper in arch/*/include/generated/asm/ continues to be used.
MIPS was recently burned by this in v4.3 (see patch 2), with continuing reports of build failures when people upgrade their trees, which go away after arch/mips/include/generated is removed (or reportedly make mrproper/distclean). It is particularly irritating during bisection. Since v2 I've seen other cases of this breaking MIPS build, and testing on x86_64, starting a build first on v4.0 and then on mainline with this patchset shows one stale generated header: REMOVE arch/x86/include/generated/asm/scatterlist.h Changes in v3: - Ensure FORCE actually gets marked .PHONY. Changes in v2: - New patch 1 to add tracking of generated headers that aren't generic-y wrappers, via generated-y, particularly for x86 (thanks to kbuild test robot). - Rewrite a bit, drawing inspiration from Makefile.headersinst. - Exclude genhdr-y and generated-y (thanks to kbuild test robot). James Hogan (2): kbuild, x86: Track generated headers with generated-y kbuild: Remove stale asm-generic wrappers Documentation/kbuild/makefiles.txt | 14 ++++++++++++++ arch/x86/include/asm/Kbuild | 6 ++++++ scripts/Makefile.asm-generic | 17 ++++++++++++++++- 3 files changed, 36 insertions(+), 1 deletion(-) Cc: Michal Marek <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: Paul Burton <[email protected]> Cc: Florian Fainelli <[email protected]> Cc: Heinrich Schuchardt <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] -- 2.4.10
