Messages in this thread | | | From | Miaohe Lin <> | Subject | [BUG Report] undefined reference to `convert_to_fxsr' | Date | Wed, 28 Dec 2022 20:31:32 +0800 |
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Hi all:
When I compile the mainline kernel v6.2-rc1, the below link error occurs:
ld: arch/x86/kernel/fpu/signal.o: in function `__fpu_restore_sig': /home/linmiaohe/linux-next/arch/x86/kernel/fpu/signal.c:421: undefined reference to `convert_to_fxsr' make[1]: *** [scripts/Makefile.vmlinux:34: vmlinux] Error 1 make: *** [Makefile:1252: vmlinux] Error 2 make: *** Waiting for unfinished jobs....
I think it's because convert_to_fxsr() is only defined when CONFIG_X86_32 or CONFIG_IA32_EMULATION is enabled. But it can be call from __fpu_restore_sig() via below path:
bool fpu__restore_sig(void __user *buf, int ia32_frame):
if (!IS_ENABLED(CONFIG_X86_64) && !cpu_feature_enabled(X86_FEATURE_FPU)) { success = !fpregs_soft_set(current, NULL, 0, sizeof(struct user_i387_ia32_struct), NULL, buf); } else { success = __fpu_restore_sig(buf, buf_fx, ia32_fxstate); /* Will call convert_to_fxsr() later. */ }
__fpu_restore_sig() will call convert_to_fxsr() even if neither CONFIG_X86_32 nor CONFIG_IA32_EMULATION is enabled. So the link error occurs. But I'm not really sure how to fix it. Any reply or fix is appreciated.
Thanks, Miaohe Lin
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