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x86/fpu: Introduce the x86_task_fpu() helper method

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The per-task FPU context/save area is allocated right
next to task_struct, currently in a variable-size
array via task_struct::thread.fpu[], but we plan to
fully hide it from the C type scope.

Introduce the x86_task_fpu() accessor that gets to the
FPU context pointer explicitly from the task pointer.

Right now this is a simple (task)->thread.fpu wrapper.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Chang S. Bae <chang.seok.bae@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250409211127.3544993-2-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2025-04-09 23:11:20 +02:00
parent cbe8e4dab1
commit 77fbccede6
1 changed files with 2 additions and 0 deletions
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2
arch/x86/include/asm/processor.h
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@ -523,6 +523,8 @@ struct thread_struct {
*/
};
#define x86_task_fpu(task) (&(task)->thread.fpu)
extern void fpu_thread_struct_whitelist(unsigned long *offset, unsigned long *size);
static inline void arch_thread_struct_whitelist(unsigned long *offset,