On Tue, Sep 16, 2025 at 02:42:48PM +0200, Nicolas Schier wrote: > > > > > Hi Alexey, > > > > > > > > > > with this patch applied, I still get a warning from objcpy as Masahiro > > > > > and Stephen wrote [1,2] > > > > > > > > > > SORTTAB vmlinux.unstripped > > > > > + sorttable vmlinux.unstripped > > > > > + nm -S vmlinux.unstripped > > > > > + ./scripts/sorttable -s .tmp_vmlinux.nm-sort vmlinux.unstripped > > > > > + is_enabled CONFIG_KALLSYMS > > > > > + grep -q ^CONFIG_KALLSYMS=y include/config/auto.conf > > > > > + cmp -s System.map .tmp_vmlinux2.syms > > > > > + echo vmlinux.unstripped: ../scripts/link-vmlinux.sh > > > > > # OBJCOPY vmlinux > > > > > objcopy --remove-section=.modinfo vmlinux.unstripped vmlinux > > > > > objcopy: vmlinux.unstripped: warning: empty loadable segment detected > > > > > at vaddr=0xffff8000807a0000, is this intentional? > > > > > > > > > > (arm64, allnoconfig) > > > > > > > > > > Kind regards, > > > > > Nicolas > > > > > > > > > > > > > > > [1]: > > > > > https://lore.kernel.org/linux-kbuild/CAK7LNAR-gD2H6Kk-rZjo0R3weTHCGTm0a=u2tRH1WWW6Sx6=r...@mail.gmail.com/ > > > > > [2]: > > > > > https://lore.kernel.org/lkml/20250730164047.7c4a7...@canb.auug.org.au/ > > > > > > > > > > > > > Hm. I missed that. I need to investigate how to fix this. Nothing comes > > > > to mind right now. > > > > > > Same here. Only thing I could find until now is > > > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/scripts/link-vmlinux.sh?id=90ceddcb495008ac8ba7a3dce297841efcd7d584 > > > > > > where '2>/dev/null' is appended exactly to prevent this very warning. > > > But for me, it doesn't feel good doing that when stripping to vmlinux. > > > > Yes, that's not a very good approach. It will hide other errors that will > > definitely need to be seen. I think the commit you mentioned is actually > > incorrect. I think there should be a different solution. > > > > I think in the case of .modinfo, we can change the flag in the section > > since we are going to delete it anyway. > > > > diff --git a/scripts/Makefile.vmlinux b/scripts/Makefile.vmlinux > > index dbbe3bf0cf23..9a118b31d0dc 100644 > > --- a/scripts/Makefile.vmlinux > > +++ b/scripts/Makefile.vmlinux > > @@ -87,7 +87,8 @@ remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += > > '.rel*' > > remove-symbols := -w --strip-symbol='__mod_device_table__*' > > > > quiet_cmd_strip_relocs = OBJCOPY $@ > > - cmd_strip_relocs = $(OBJCOPY) $(addprefix > > --remove-section=,$(remove-section-y)) \ > > + cmd_strip_relocs = $(OBJCOPY) $(patsubst %,--set-section-flags > > %=noload,$(remove-section-y)) $< && \ > > + $(OBJCOPY) $(addprefix > > --remove-section=,$(remove-section-y)) \ > > $(remove-symbols) $< $@ > > > > targets += vmlinux > > Ah, great! I thought we had to fiddle around with linker scripts et al. > I needed to use an intermediate file: > > diff --git a/scripts/Makefile.vmlinux b/scripts/Makefile.vmlinux > index e2ceeb9e168d..516d51ca634b 100644 > --- a/scripts/Makefile.vmlinux > +++ b/scripts/Makefile.vmlinux > @@ -90,6 +90,9 @@ remove-section-y := > .modinfo > remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*' > > quiet_cmd_strip_relocs = OBJCOPY $@ > - cmd_strip_relocs = $(OBJCOPY) $(addprefix > --remove-section=,$(remove-section-y)) $< $@ > + cmd_strip_relocs = set -e; \ > + trap 'rm $<.noload' EXIT HUP INT; \ > + $(OBJCOPY) $(patsubst %,--set-section-flags > %=noload,$(remove-section-y)) $< $<.noload && \ > + $(OBJCOPY) $(addprefix > --remove-section=,$(remove-section-y)) $<.noload $@ > > targets += vmlinux
according to man-page: If you do not specify outfile, objcopy creates a temporary file and destructively renames the result with the name of infile. That is true even in freebsd: https://man.freebsd.org/cgi/man.cgi?query=objcopy Do you want to support any other objcopy implementations ? -- Rgrds, legion
