linux-kernel - [patch V2 23/52] x86/fpu: Rename copy_user_to_xregs() and copy_xregs_to

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Date:   Mon, 14 Jun 2021 17:44:31 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [patch V2 23/52] x86/fpu: Rename copy_user_to_xregs() and
 copy_xregs_to_user()

The function names for xsave[s]/xrstor[s] operations are horribly named and
a permanent source of confusion.

Rename:
	copy_xregs_to_user() to xsave_to_user_sigframe()
	copy_user_to_xregs() to xrstor_from_user_sigframe()

so it's entirely clear what this is about. This is also a clear indicator
of the potentially different storage format because this is user ABI and
cannot use compacted format.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/fpu/internal.h |    4 ++--
 arch/x86/kernel/fpu/signal.c        |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -324,7 +324,7 @@ static inline void xrstor_from_kernel(st
  * backward compatibility for old applications which don't understand
  * compacted format of xsave area.
  */
-static inline int copy_xregs_to_user(struct xregs_state __user *buf)
+static inline int xsave_to_user_sigframe(struct xregs_state __user *buf)
 {
 	u64 mask = xfeatures_mask_user();
 	u32 lmask = mask;
@@ -349,7 +349,7 @@ static inline int copy_xregs_to_user(str
 /*
  * Restore xstate from user space xsave area.
  */
-static inline int copy_user_to_xregs(struct xregs_state __user *buf, u64 mask)
+static inline int xrstor_from_user_sigframe(struct xregs_state __user *buf, u64 mask)
 {
 	struct xregs_state *xstate = ((__force struct xregs_state *)buf);
 	u32 lmask = mask;
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -129,7 +129,7 @@ static inline int copy_fpregs_to_sigfram
 	int err;
 
 	if (use_xsave())
-		err = copy_xregs_to_user(buf);
+		err = xsave_to_user_sigframe(buf);
 	else if (use_fxsr())
 		err = copy_fxregs_to_user((struct fxregs_state __user *) buf);
 	else
@@ -276,7 +276,7 @@ static int copy_user_to_fpregs_zeroing(v
 		} else {
 			init_bv = xfeatures_mask_user() & ~xbv;
 
-			r = copy_user_to_xregs(buf, xbv);
+			r = xrstor_from_user_sigframe(buf, xbv);
 			if (!r && unlikely(init_bv))
 				xrstor_from_kernel(&init_fpstate.xsave, init_bv);
 			return r;