From: Pawan Gupta Date: Fri, 30 May 2025 06:01:54 +0000 (-0700) Subject: x86/its: Fix undefined reference to cpu_wants_rethunk_at() X-Git-Tag: v5.15.185~19 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5492aaea844e007630bc70aa45050c329dd72d3d;p=thirdparty%2Fkernel%2Fstable.git x86/its: Fix undefined reference to cpu_wants_rethunk_at() Below error was reported in a 32-bit kernel build: static_call.c:(.ref.text+0x46): undefined reference to `cpu_wants_rethunk_at' make[1]: [Makefile:1234: vmlinux] Error This is because the definition of cpu_wants_rethunk_at() depends on CONFIG_STACK_VALIDATION which is only enabled in 64-bit mode. Define the empty function for CONFIG_STACK_VALIDATION=n, rethunk mitigation is anyways not supported without it. Reported-by: Guenter Roeck Fixes: 5d19a0574b75 ("x86/its: Add support for ITS-safe return thunk") Signed-off-by: Pawan Gupta Link: https://lore.kernel.org/stable/0f597436-5da6-4319-b918-9f57bde5634a@roeck-us.net/ Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h index 1797f80c10de4..a5f704dbb4a1d 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -98,7 +98,7 @@ static inline u8 *its_static_thunk(int reg) } #endif -#ifdef CONFIG_RETHUNK +#if defined(CONFIG_RETHUNK) && defined(CONFIG_STACK_VALIDATION) extern bool cpu_wants_rethunk(void); extern bool cpu_wants_rethunk_at(void *addr); #else