linux-kernel - Re: [BUG] x86_64: build failure in switch_fpu() due to missing x86_task

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Message-ID: <24FFA367-A571-4C61-9D09-C226CDD05E42@zytor.com>
Date: Fri, 08 Aug 2025 22:37:53 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: andreasx0 <andreasx0@...tonmail.com>,
        "CC:  Thomas Gleixner" <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] x86_64: build failure in switch_fpu() due to missing x86_task_fpu() declaration (v6.16)

On August 8, 2025 6:18:12 PM PDT, andreasx0 <andreasx0@...tonmail.com> wrote:
>Hello,
>When building Linux kernel v6.16 for x86_64, I encountered a build failure:
>
>  In file included from arch/x86/kernel/process_64.c:46:
>  ./arch/x86/include/asm/fpu/sched.h:37:39: error: implicit declaration of function ‘x86_task_fpu’; did you mean ‘set_task_cpu’? [-Wimplicit-function-declaration]
>     37 |                 struct fpu *old_fpu = x86_task_fpu(old);
>        |                                       ^~~~~~~~~~~~
>        |                                       set_task_cpu
>  ./arch/x86/include/asm/fpu/sched.h:37:39: error: initialization of ‘struct fpu *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
>
>
>Thanks
What is your .config file?