On Mon, Feb 22, 2021 at 5:30 PM Naresh Kamboju naresh.kamboju@linaro.org wrote:
On Mon, 22 Feb 2021 at 21:44, Sedat Dilek sedat.dilek@gmail.com wrote:
On Mon, Feb 22, 2021 at 5:08 PM Naresh Kamboju naresh.kamboju@linaro.org wrote:
While building i386 configs on stable-rc 5.10, stable-rc 5.11 branch and mainline with clang-12 these following warnings and errors were noticed.
Hi Naresh,
Please see commit bb73d07148c405c293e576b40af37737faf23a6a ("x86/build: Treat R_386_PLT32 relocation as R_386_PC32"). Recently accepted into Linus Git tree.
Can this be backported / cherry-picked into stable-rc 5.10 and stable-rc 5.11 ?
I have this one in my custom patchset (even though I only build x86-64).
Makes sense to have it in Linux v5.10.y LTS and Linux v5.11.y and maybe other linux-stable releases.
The usual way to get a fix into linux-stable is to contact Greg and Sasha - the Linux-stable maintainers and ask for inclusion. See "STABLE BRANCH" in MAINTAINERS. But we have also LLVM/Clang maintainers (see [2]). Cannot say if you address LLVM/Clang maintainers first... and they help or what is the recommended/ideal way.
- Sedat -
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/MAIN... [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/MAIN...
[1] says:
Further info for the more interested:
https://github.com/ClangBuiltLinux/linux/issues/1210 https://sourceware.org/bugzilla/show_bug.cgi?id=27169 https://github.com/llvm/llvm-project/commit/a084c0388e2a59b9556f2de008333323...
Hope that helps.
- Sedat -
[1] https://git.kernel.org/linus/bb73d07148c405c293e576b40af37737faf23a6a
make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=i386 CROSS_COMPILE=i686-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache clang'
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:2586:9: warning: shift count >= width of type [-Wshift-count-overflow]
return hweight64(VDBOX_MASK(&i915->gt)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~include/asm-generic/bitops/const_hweight.h:29:49: note: expanded from macro 'hweight64' #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) ^~~~~~~~~~~~~~~~~~~~ include/asm-generic/bitops/const_hweight.h:21:76: note: expanded from macro '__const_hweight64' #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) ^ ~~ include/asm-generic/bitops/const_hweight.h:20:49: note: expanded from macro '__const_hweight32' #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) ^ include/asm-generic/bitops/const_hweight.h:19:48: note: expanded from macro '__const_hweight16' #define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 )) ^ include/asm-generic/bitops/const_hweight.h:10:9: note: expanded from macro '__const_hweight8' ((!!((w) & (1ULL << 0))) + \ ^ drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:2586:9: warning: shift count >= width of type [-Wshift-count-overflow] return hweight64(VDBOX_MASK(&i915->gt)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<trim>
32 warnings generated. Unsupported relocation type: R_386_PLT32 (4) make[3]: *** [arch/x86/boot/compressed/Makefile:116: arch/x86/boot/compressed/vmlinux.relocs] Error 1 make[3]: *** Deleting file 'arch/x86/boot/compressed/vmlinux.relocs' make[3]: Target 'arch/x86/boot/compressed/vmlinux' not remade because of errors.
Reported-by: Naresh Kamboju naresh.kamboju@linaro.org
Steps to reproduce:
# TuxMake is a command line tool and Python library that provides # portable and repeatable Linux kernel builds across a variety of # architectures, toolchains, kernel configurations, and make targets. # # TuxMake supports the concept of runtimes. # See https://docs.tuxmake.org/runtimes/, for that to work it requires # that you install podman or docker on your system. # # To install tuxmake on your system globally: # sudo pip3 install -U tuxmake # # See https://docs.tuxmake.org/ for complete documentation.
tuxmake --runtime podman --target-arch i386 --toolchain clang-12 --kconfig defconfig --kconfig-add https://builds.tuxbuild.com/1opxSKxZuRowPsiOsSJ0IoUOXOt/config
-- Linaro LKFT https://lkft.linaro.org
- Naresh