linux-kernel - [tip:x86/fpu] x86/fpu: Flip the parameter order in copy_*_to

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Date:   Tue, 26 Sep 2017 01:27:02 -0700
From:   tip-bot for Ingo Molnar <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     fenghua.yu@...el.com, torvalds@...ux-foundation.org,
        mingo@...nel.org, akpm@...ux-foundation.org, yu-cheng.yu@...el.com,
        oleg@...hat.com, ebiggers3@...il.com, hpa@...or.com,
        luto@...capital.net, tglx@...utronix.de, peterz@...radead.org,
        luto@...nel.org, riel@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: [tip:x86/fpu] x86/fpu: Flip the parameter order in
 copy_*_to_xstate()

Commit-ID:  6d7f7da5533a3f841eeb1d9657257c9367924274
Gitweb:     http://git.kernel.org/tip/6d7f7da5533a3f841eeb1d9657257c9367924274
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:57 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 24 Sep 2017 13:04:33 +0200

x86/fpu: Flip the parameter order in copy_*_to_xstate()

Make it more consistent with regular memcpy() semantics, where the destination
argument comes first.

No change in functionality.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Eric Biggers <ebiggers3@...il.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@...el.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-15-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/fpu/xstate.h | 4 ++--
 arch/x86/kernel/fpu/regset.c      | 4 ++--
 arch/x86/kernel/fpu/signal.c      | 2 +-
 arch/x86/kernel/fpu/xstate.c      | 4 ++--
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 4ceb907..579ac23 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -50,6 +50,6 @@ const void *get_xsave_field_ptr(int xstate_field);
 int using_compacted_format(void);
 int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
 int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
-int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave);
-int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave);
+int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
+int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
 #endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index caf723f..19a7385 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -136,9 +136,9 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
 
 	if (boot_cpu_has(X86_FEATURE_XSAVES)) {
 		if (kbuf)
-			ret = copy_kernel_to_xstate(kbuf, xsave);
+			ret = copy_kernel_to_xstate(xsave, kbuf);
 		else
-			ret = copy_user_to_xstate(ubuf, xsave);
+			ret = copy_user_to_xstate(xsave, ubuf);
 	} else {
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
 	}
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 2c685b4..2d682da 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -324,7 +324,7 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
 		fpu__drop(fpu);
 
 		if (using_compacted_format())
-			err = copy_user_to_xstate(buf_fx, &fpu->state.xsave);
+			err = copy_user_to_xstate(&fpu->state.xsave, buf_fx);
 		else
 			err = __copy_from_user(&fpu->state.xsave, buf_fx, state_size);
 
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index b1f3e4d..0ef3504 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1089,7 +1089,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
  * there we check the CPU has XSAVES and a whole standard-sized buffer
  * exists.
  */
-int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
+int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
 {
 	unsigned int offset, size;
 	int i;
@@ -1142,7 +1142,7 @@ int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
  * there we check the CPU has XSAVES and a whole standard-sized buffer
  * exists.
  */
-int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave)
+int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf)
 {
 	unsigned int offset, size;
 	int i;