linux-kernel - [PATCH] x86/boot: explicitly place .eh

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Date:   Mon,  4 Nov 2019 11:03:38 +0200
From:   Ilie Halip <ilie.halip@...il.com>
To:     x86@...nel.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Ilie Halip <ilie.halip@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] x86/boot: explicitly place .eh_frame after .rodata

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 ld.lld has different rules for placing
orphan sections (i.e. sections not mentioned in a linker script)
compared to ld.bfd.

Particularly, in this case, the merged .eh_frame section is
placed before __end_init, which triggers an assert in the script.

Explicitly place this section after .rodata, in accordance with
ld.bfd's behavior.

Signed-off-by: Ilie Halip <ilie.halip@...il.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/760
---
 arch/x86/boot/setup.ld | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/boot/setup.ld b/arch/x86/boot/setup.ld
index 0149e41d42c2..4e02eab11b59 100644
--- a/arch/x86/boot/setup.ld
+++ b/arch/x86/boot/setup.ld
@@ -25,6 +25,7 @@ SECTIONS
 
 	. = ALIGN(16);
 	.rodata		: { *(.rodata*) }
+	.eh_frame	: { *(.eh_frame*) }
 
 	.videocards	: {
 		video_cards = .;
-- 
2.17.1