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| author | Ingo Molnar <mingo@kernel.org> | 2025-04-09 23:11:23 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-04-14 08:18:29 +0200 |
| commit | 55bc30f2e34dcc17a370d1f6c1c992be107c4502 (patch) | |
| tree | 5c7102010a2b29b0bc2c9d83df4330abfbcf5bf6 /arch/x86/include/asm/processor.h | |
| parent | x86/fpu: Make task_struct::thread constant size (diff) | |
| download | linux-55bc30f2e34dcc17a370d1f6c1c992be107c4502.tar.gz linux-55bc30f2e34dcc17a370d1f6c1c992be107c4502.zip | |
x86/fpu: Remove the thread::fpu pointer
As suggested by Oleg, remove the thread::fpu pointer, as we can
calculate it via x86_task_fpu() at compile-time.
This improves code generation a bit:
kepler:~/tip> size vmlinux.before vmlinux.after
text data bss dec hex filename
26475405 10435342 1740804 38651551 24dc69f vmlinux.before
26475339 10959630 1216516 38651485 24dc65d vmlinux.after
Suggested-by: Oleg Nesterov <oleg@redhat.com>
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: Peter Zijlstra <peterz@infradead.org>
Cc: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/r/20250409211127.3544993-5-mingo@kernel.org
Diffstat (limited to 'arch/x86/include/asm/processor.h')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 5ea7e5d2c4de..b7f7c9c83409 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -514,12 +514,9 @@ struct thread_struct { struct thread_shstk shstk; #endif - - /* Floating point and extended processor state */ - struct fpu *fpu; }; -#define x86_task_fpu(task) ((task)->thread.fpu) +#define x86_task_fpu(task) ((struct fpu *)((void *)(task) + sizeof(*(task)))) /* * X86 doesn't need any embedded-FPU-struct quirks: |