[PATCH] riscv: disable generation of unwind tables

[PATCH] riscv: disable generation of unwind tables

[Andreas Schwab]

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 <schwab@suse.de>
---
 arch/riscv/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index faf2c2177094..82153960ac00 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -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)
 
-- 
2.39.1


-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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Re: [PATCH] riscv: disable generation of unwind tables

[patchwork-bot+linux-riscv]

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer@rivosinc.com>:

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 <schwab@suse.de>
> 
> [...]

Here is the summary with links:
  - riscv: disable generation of unwind tables
    https://git.kernel.org/riscv/c/2f394c0e7d11

You are awesome, thank you!
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