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authorIngo Molnar <mingo@kernel.org>2025-04-10 12:52:16 +0200
committerIngo Molnar <mingo@kernel.org>2025-04-14 08:18:29 +0200
commite3a52b67f54aa36ab21265eeea016460b5fe1c46 (patch)
tree339345ab3f97e7a42ccf8cf984c48d563fb461b1
parent8b2a7a7294b34fa00adbecbd352ef19eb780261b (diff)
x86/fpu: Clarify FPU context cacheline alignment
Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Chang S. Bae <chang.seok.bae@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Link: https://lore.kernel.org/r/Z_ejggklB5-IWB5W@gmail.com
-rw-r--r--arch/x86/kernel/fpu/core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index d0a45f6492cb..3a19877a314e 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -607,7 +607,8 @@ int fpu_clone(struct task_struct *dst, unsigned long clone_flags, bool minimal,
* We allocate the new FPU structure right after the end of the task struct.
* task allocation size already took this into account.
*
- * This is safe because task_struct size is a multiple of cacheline size.
+ * This is safe because task_struct size is a multiple of cacheline size,
+ * thus x86_task_fpu() will always be cacheline aligned as well.
*/
struct fpu *dst_fpu = (void *)dst + sizeof(*dst);