linux-kernel - [PATCH v3] scripts: Do not strip .rela.dyn section

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Message-Id: <20250408072851.90275-1-alexghiti@rivosinc.com>
Date: Tue,  8 Apr 2025 09:28:51 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	Björn Töpel <bjorn@...osinc.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Ard Biesheuvel <ardb@...nel.org>,
	Charlie Jenkins <charlie@...osinc.com>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kbuild@...r.kernel.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH v3] scripts: Do not strip .rela.dyn section

The .rela.dyn section contains runtime relocations and is only emitted
for a relocatable kernel.

riscv uses this section to relocate the kernel at runtime but that section
is stripped from vmlinux. That prevents kexec to successfully load vmlinux
since it does not contain the relocations info needed.

Fixes: 559d1e45a16d ("riscv: Use --emit-relocs in order to move .rela.dyn in init")
Tested-by: Björn Töpel <bjorn@...osinc.com>
Reviewed-by: Björn Töpel <bjorn@...osinc.com>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---

Changes in v3:
- Rebase on top of 6.15-rc1
- Change the fixes tag

Changes in v2:
- Changelog modification (Ard)
- Remove ARCH_WANTS_RELA_DYN (Ard)

 scripts/Makefile.vmlinux | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.vmlinux b/scripts/Makefile.vmlinux
index b0a6cd5b818c..85d60d986401 100644
--- a/scripts/Makefile.vmlinux
+++ b/scripts/Makefile.vmlinux
@@ -13,7 +13,7 @@ ifdef CONFIG_ARCH_VMLINUX_NEEDS_RELOCS
 vmlinux-final := vmlinux.unstripped
 
 quiet_cmd_strip_relocs = RSTRIP  $@
-      cmd_strip_relocs = $(OBJCOPY) --remove-section='.rel*' $< $@
+      cmd_strip_relocs = $(OBJCOPY) --remove-section='.rel*' --remove-section=!'.rel*.dyn' $< $@
 
 vmlinux: $(vmlinux-final) FORCE
 	$(call if_changed,strip_relocs)
-- 
2.39.2