On Sat, Jan 16, 2021 at 12:44:38PM -0600, Segher Boessenkool wrote:
Hi!
Very late of course, and the patch is fine, but:
On Mon, Jan 04, 2021 at 01:59:53PM -0700, Nathan Chancellor wrote:
Commit eff8728fe698 ("vmlinux.lds.h: Add PGO and AutoFDO input sections") added ".text.unlikely.*" and ".text.hot.*" due to an LLVM change [1].
After another LLVM change [2], these sections are seen in some PowerPC builds, where there is a orphan section warning then build failure:
$ make -skj"$(nproc)" \ ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- LLVM=1 O=out \ distclean powernv_defconfig zImage.epapr ld.lld: warning: kernel/built-in.a(panic.o):(.text.unlikely.) is being placed in '.text.unlikely.'
Is the section really called ".text.unlikely.", i.e. the name ending in a dot? How very unusual, is there some bug elsewhere?
No, this was an intention change done by LLVM: https://reviews.llvm.org/D79600
Cheers, Nathan