Skip to contentSkip to conversation

riscv: disable generation of unwind tables

PATCH Applied Andreas Schwab 2 participants 2 messages Feb 1, 2023 – Feb 2, 2023 RISC-V

lore
Share & tools
lore

Andreas Schwab

author
#0 lore raw

PATCH 1/1 riscv: disable generation of unwind tables

GCC 13 will enable -fasynchronous-unwind-tables by default on riscv. In the kernel, we don't have any use for unwind tables yet, so disable them. More importantly, the .eh_frame section brings relocations (R_RISC_32_PCREL, R_RISCV_SET{6,8,16}, R_RISCV_SUB{6,8,16}) into modules that we are not prepared to handle.

Signed-off-by Andreas Schwab <[email protected]>
---
 arch/riscv/Makefile | 3 +++
 1 file changed, 3 insertions(+)
arch/riscv/Makefile +3 -0
index faf2c2177094..82153960ac00 100644
@@ -80,6 +80,9 @@ ifeq ($(CONFIG_PERF_EVENTS),y)
         KBUILD_CFLAGS += -fno-omit-frame-pointer
 endif
 
+# Avoid generating .eh_frame sections.
+KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
+
 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
 KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
Signature · 7 lines
2.39.1


-- 
Andreas Schwab, SUSE Labs, [email protected]
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
CI Applied
#1 lore raw
This patch was applied to riscv/linux.git (fixes) by Palmer Dabbelt <[email protected]>:

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <[email protected]>:

Quoted 9 lines · On Wed, 01 Feb 2023 10:29:45 +0100 you wrote:

GCC 13 will enable -fasynchronous-unwind-tables by default on riscv. In the kernel, we don't have any use for unwind tables yet, so disable them. More importantly, the .eh_frame section brings relocations (R_RISC_32_PCREL, R_RISCV_SET{6,8,16}, R_RISCV_SUB{6,8,16}) into modules that we are not prepared to handle.

Signed-off-by Andreas Schwab <[email protected]>

[...]

Here is the summary with links:
- riscv: disable generation of unwind tables

    https://git.kernel.org/riscv/c/2f394c0e7d11

You are awesome, thank you!

Signature · 2 lines
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html