| Message ID | 20231123110506.707903-7-arnd@kernel.org (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | Treewide: enable -Wmissing-prototypes | expand |
On Thu, Nov 23, 2023 at 12:05:06PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > Over the years we went from > 1000 of warnings to under 100 earlier > this year, and I sent patches to address all the ones that I saw with > compile testing randcom configs on arm64, arm and x86 kernels. This is a > really useful warning, as it catches real bugs when there are mismatched > prototypes. In particular with kernel control flow integrity enabled, > those are no longer allowed. > > I have done extensive testing to ensure that there are no new build > errors or warnings on any configuration of x86, arm and arm64 builds. > I also made sure that at least the both the normal defconfig and an > allmodconfig build is clean for arc, csky, loongarch, m68k, microblaze, > openrisc, parisc, powerpc, riscv, s390, and xtensa, with the respective > maintainers doing most of the patches. > > At this point, there are five architectures with a number of known > regressions: alpha, nios2, mips, sh and sparc. In the previous version > of this patch, I had turned off the missing prototype warnings for the 15 > architectures that still had issues, but since there are only five left, > I think we can leave the rest to the maintainers (Cc'd here) as well. > Not sure I understand why this was so important that it warrants the resulting buildtest failures. FWIW, I'll disable WERROR in my build tests for the affected architectures. That is kind of counter-productive, but the only real alternative would be to stop build (and sometimes, such as for ppc, runtime) tests entirely, which would be even worse. Guenter
On Wed, Jan 10, 2024, at 20:45, Guenter Roeck wrote: > On Thu, Nov 23, 2023 at 12:05:06PM +0100, Arnd Bergmann wrote: >> At this point, there are five architectures with a number of known >> regressions: alpha, nios2, mips, sh and sparc. In the previous version >> of this patch, I had turned off the missing prototype warnings for the 15 >> architectures that still had issues, but since there are only five left, >> I think we can leave the rest to the maintainers (Cc'd here) as well. >> > > Not sure I understand why this was so important that it warrants the > resulting buildtest failures. > > FWIW, I'll disable WERROR in my build tests for the affected architectures. > That is kind of counter-productive, but the only real alternative would be > to stop build (and sometimes, such as for ppc, runtime) tests entirely, > which would be even worse. If you prefer, I can go back to the older version and just disable the warning for the architectures with defconfig build failures. I did a lot of fixes for mips, so at least defconfig and allmodconfig should be fine now, leaving only alpha, nios2, sh and sparc as far as I can tell, at least once Linus merges the asm-generic pull request hat has a bunch of the currently missing fixes. Arnd
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index 1527199161d7..8e9170f932ea 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -17,6 +17,8 @@ KBUILD_CFLAGS += -Wno-format-security KBUILD_CFLAGS += -Wno-trigraphs KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) +KBUILD_CFLAGS += -Wmissing-declarations +KBUILD_CFLAGS += -Wmissing-prototypes ifneq ($(CONFIG_FRAME_WARN),0) KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) @@ -95,10 +97,8 @@ export KBUILD_EXTRA_WARN ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),) KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter -KBUILD_CFLAGS += -Wmissing-declarations KBUILD_CFLAGS += $(call cc-option, -Wrestrict) KBUILD_CFLAGS += -Wmissing-format-attribute -KBUILD_CFLAGS += -Wmissing-prototypes KBUILD_CFLAGS += -Wold-style-definition KBUILD_CFLAGS += -Wmissing-include-dirs KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)