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

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Message-ID: <sKlZWc4ZTdYjcxIz044xyWaiwKFcUX0hvTA1IJ_QTzQ3sXhTuLidgIZS2d51P-t1TQHt3F4eXLfXLGbXpisbBqpsZxCsWhpbWUoNe4ESC-o=@protonmail.com>
Date: Sat, 09 Aug 2025 01:18:12 +0000
From: andreasx0 <andreasx0@...tonmail.com>
To: "CC:  Thomas Gleixner" <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [BUG] x86_64: build failure in switch_fpu() due to missing x86_task_fpu() declaration (v6.16)

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
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