Messages in this thread Patch in this message | | | Date | Sat, 14 Dec 2019 07:12:55 -0000 | From | "tip-bot2 for Ilie Halip" <> | Subject | [tip: x86/boot] x86/boot: Discard .eh_frame sections |
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The following commit has been merged into the x86/boot branch of tip:
Commit-ID: 163159aad74d3763b350861b879b41e8f64121fc Gitweb: https://git.kernel.org/tip/163159aad74d3763b350861b879b41e8f64121fc Author: Ilie Halip <ilie.halip@gmail.com> AuthorDate: Tue, 26 Nov 2019 16:45:44 +02:00 Committer: Borislav Petkov <bp@suse.de> CommitterDate: Fri, 13 Dec 2019 11:45:59 +01:00
x86/boot: Discard .eh_frame sections
When using GCC as compiler and LLVM's lld as linker, linking setup.elf fails:
LD arch/x86/boot/setup.elf ld.lld: error: init sections too big!
This happens because GCC generates .eh_frame sections for most of the files in that directory, then ld.lld places the merged section before __end_init, triggering an assert in the linker script.
Fix this by discarding the .eh_frame sections, as suggested by Boris. The kernel proper linker script discards them too.
[ bp: Going back in history, 64-bit kernel proper has been discarding .eh_frame since 2002:
commit acca80acefe20420e69561cf55be64f16c34ea97 Author: Andi Kleen <ak@muc.de> Date: Tue Oct 29 23:54:35 2002 -0800
[PATCH] x86-64 updates for 2.5.44
...
- Remove the .eh_frame on linking. This saves several hundred KB in the bzImage ]
Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Ilie Halip <ilie.halip@gmail.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com Cc: Andy Lutomirski <luto@kernel.org> Cc: clang-built-linux@googlegroups.com Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lore.kernel.org/lkml/20191118175223.GM6363@zn.tnic/ Link: https://github.com/ClangBuiltLinux/linux/issues/760 Link: https://lkml.kernel.org/r/20191126144545.19354-1-ilie.halip@gmail.com --- arch/x86/boot/setup.ld | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/boot/setup.ld b/arch/x86/boot/setup.ld index 0149e41..3da1c37 100644 --- a/arch/x86/boot/setup.ld +++ b/arch/x86/boot/setup.ld @@ -51,7 +51,10 @@ SECTIONS . = ALIGN(16); _end = .; - /DISCARD/ : { *(.note*) } + /DISCARD/ : { + *(.eh_frame) + *(.note*) + } /* * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
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