[tip: x86/fpu] x86/fpu: Clarify the "xa" symbolic name used in the XSTATE* macros

[tip-bot2 for Borislav Petkov (AMD)]

The following commit has been merged into the x86/fpu branch of tip:

Commit-ID:     4348e9177813656d5d8bd18f34b3e611df004032
Gitweb:        https://git.kernel.org/tip/4348e9177813656d5d8bd18f34b3e611df004032
Author:        Borislav Petkov (AMD) <bp@xxxxxxxxx>
AuthorDate:    Mon, 17 Mar 2025 13:47:12 +01:00
Committer:     Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Mon, 17 Mar 2025 13:47:12 +01:00

x86/fpu: Clarify the "xa" symbolic name used in the XSTATE* macros

Tie together the %[xa] in the XSAVE/XRSTOR definitions with the
respective usage in the asm macros so that it is perfectly clear.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
---
 arch/x86/kernel/fpu/xstate.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h
index 1418423..0fd34f5 100644
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -109,6 +109,10 @@ static inline int update_pkru_in_sigframe(struct xregs_state __user *buf, u64 ma
 /*
  * After this @err contains 0 on success or the trap number when the
  * operation raises an exception.
+ *
+ * The [xa] input parameter below represents the struct xregs_state pointer
+ * and the asm symbolic name for the argument used in the XSAVE/XRSTOR insns
+ * above.
  */
 #define XSTATE_OP(op, st, lmask, hmask, err)				\
 	asm volatile("1:" op "\n\t"					\