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a=ul9cdbp4aOFLsgKbc677:22 X-Proofpoint-ORIG-GUID: mSWjlFLmZQJjhmMb7U4voIMHVTK9GKeE On 2026-01-24 4:04 a.m., Sven Joachim wrote: > On 2025-09-04 10:14 -0700, Josh Poimboeuf wrote: > >> On Thu, Sep 04, 2025 at 06:34:04PM +0200, Sebastian Andrzej Siewior wrote: >>> On 2025-09-04 16:02:42 [+0200], Matthias Klose wrote: >>>> [ CCing binutils@sourceware.org ] >>>> >>>> On 9/4/25 15:18, Sebastian Andrzej Siewior wrote: >>>>> Hi, >>>>> >>>>> gcc in Debian, starting with 15.2.0-2, 14.3.0-6 enables sframe >>>>> generation. Unless options like -ffreestanding are passed. Since this >>>>> isn't done, there are a few warnings during compile >>>> >>>> If there are other options when sframe shouldn't be enabled, please tell. >>> >>> No, I think this is okay. >>> >>> … >>>>> We could drop the sframe during the final link but this does not get rid >>>>> of the objtool warnings so we would have to ignore them. But we don't >>>>> need it. So what about the following: >>>>> >>>>> diff --git a/Makefile b/Makefile >>>>> --- a/Makefile >>>>> +++ b/Makefile >>>>> @@ -886,6 +886,8 @@ ifdef CONFIG_CC_IS_GCC >>>>> KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) >>>>> KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) >>>>> endif >>>>> +# No sframe generation for kernel if enabled by default >>>>> +KBUILD_CFLAGS += $(call cc-option,-Xassembler --gsframe=no) >>>>> ifdef CONFIG_READABLE_ASM >>>>> # Disable optimizations that make assembler listings hard to read. >>>> This is what I chose for package builds that need disablement of sframe. >>> >>> I think this would work for now. Longterm we would have to allow sframe >>> creation and keep section if an architecture decides to use it for its >>> backtracing. While orc seems fine on x86, there are arm64 patches to use >>> for as a stack unwinder. >> >> This is probably fine, but... how does this interact with other kernel >> makefiles enabling sframe? For example, x86 will soon have a patch to >> enable sframe generation for vdso. And as you mentioned, arm64 will >> enable it kernel-wide. >> >> Removing the objtool !ENDBR warnings would be trivial (and is a good >> thing to do regardless). > > What is the status of sframe support in the kernel? With current > binutils (version 2.45.50.20260119-1) from Debian I could not build > Linux 6.18.7: > > ,---- > | # LD arch/x86/boot/compressed/vmlinux > | ld -m elf_x86_64 --no-ld-generated-unwind-info -pie --no-dynamic-linker --orphan-handling=error -z noexecstack --no-warn-rwx-segments -T arch/x86/boot/compressed/vmlinux.lds arch/x86/boot/compressed/kernel_info.o arch/x86/boot/compressed/head_64.o arch/x86/boot/compressed/misc.o arch/x86/boot/compressed/string.o arch/x86/boot/compressed/cmdline.o arch/x86/boot/compressed/error.o arch/x86/boot/compressed/piggy.o arch/x86/boot/compressed/cpuflags.o arch/x86/boot/compressed/early_serial_console.o arch/x86/boot/compressed/kaslr.o arch/x86/boot/compressed/ident_map_64.o arch/x86/boot/compressed/idt_64.o arch/x86/boot/compressed/idt_handlers_64.o arch/x86/boot/compressed/pgtable_64.o arch/x86/boot/compressed/acpi.o arch/x86/boot/startup/lib.a -o arch/x86/boot/compressed/vmlinux > | /usr/bin/x86_64-linux-gnu-ld.bfd: error: unplaced orphan section `.sframe' from `arch/x86/boot/compressed/kernel_info.o' > | /usr/bin/x86_64-linux-gnu-ld.bfd: error: unplaced orphan section `.sframe' from `arch/x86/boot/compressed/kernel_info.o' > | make[6]: *** [arch/x86/boot/compressed/Makefile:116: arch/x86/boot/compressed/vmlinux] Error 1 > | make[5]: *** [arch/x86/boot/Makefile:96: arch/x86/boot/compressed/vmlinux] Error 2 > `---- > Sorry for the breakage. There is a patch that needs to make it upstream https://sourceware.org/pipermail/binutils/2026-January/147664.html (Its a part of a series under review..) I will work on getting this patch committed. For immediate relief, please use the new ld option --discard-sframe meanwhile. > Did not test mainline yet, but "git log --grep=sframe master" does not > show anything interesting. > > Cheers, > Sven