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x86/bug: Fix old GCC compile fails

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For some mysterious reasons the GCC 8 and 9 preprocessor manages to
sporadically fumble _ASM_BYTES(0x0f, 0x0b):

$ grep ".byte[ ]*0x0f" defconfig-build/drivers/net/wireless/realtek/rtlwifi/base.s
        1:       .byte0x0f,0x0b ;
        1:       .byte 0x0f,0x0b ;

which makes the assembler upset and all that. While there are more
_ASM_BYTES() users (notably the NOP instructions), those don't seem
affected. Therefore replace the offending ASM_UD2 with one using the
ud2 mnemonic.

Reported-by: Jean Delvare <jdelvare@suse.de>
Suggested-by: Uros Bizjak <ubizjak@gmail.com>
Fixes: 85a2d4a890 ("x86,ibt: Use UDB instead of 0xEA")
Cc: stable@kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251218104659.GT3911114@noisy.programming.kicks-ass.net
This commit is contained in:
Peter Zijlstra
2025-12-18 11:47:38 +01:00
parent 0edc78b82b
commit c56a12c71a
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/bug.h
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@@ -15,7 +15,7 @@ extern void __WARN_trap(struct bug_entry *bug, ...);
/*
* Despite that some emulators terminate on UD2, we use it for WARN().
*/
#define ASM_UD2 _ASM_BYTES(0x0f, 0x0b)
#define ASM_UD2 __ASM_FORM(ud2)
#define INSN_UD2 0x0b0f
#define LEN_UD2 2