[PATCH 05/33] x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs

[Ingo Molnar]

Parameter ordering is weird:

  int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, struct xregs_state *xsave);
  int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, struct xregs_state *xsave);

'pos' and 'count', which are attributes of the destination buffer, are listed before the destination
buffer itself ...

List them after the primary arguments instead.

This makes the code more similar to regular memcpy() variant APIs.

No change in functionality.

Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/include/asm/fpu/xstate.h |  4 ++--
 arch/x86/kernel/fpu/regset.c      |  4 ++--
 arch/x86/kernel/fpu/xstate.c      | 25 ++++++++++++-------------
 3 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 65bd68c30cd0..e4430b84939d 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -48,8 +48,8 @@ void fpu__xstate_clear_all_cpu_caps(void);
 void *get_xsave_addr(struct xregs_state *xsave, int xstate);
 const void *get_xsave_field_ptr(int xstate_field);
 int using_compacted_format(void);
-int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, struct xregs_state *xsave);
-int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, struct xregs_state *xsave);
+int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count);
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count);
 int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
 		     struct xregs_state *xsave);
 #endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index fd6dbdd8fde6..ec1404194b65 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -93,9 +93,9 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
 
 	if (using_compacted_format()) {
 		if (kbuf)
-			ret = copy_xstate_to_kernel(pos, count, kbuf, xsave);
+			ret = copy_xstate_to_kernel(kbuf, xsave, pos, count);
 		else
-			ret = copy_xstate_to_user(pos, count, ubuf, xsave);
+			ret = copy_xstate_to_user(ubuf, xsave, pos, count);
 	} else {
 		fpstate_sanitize_xstate(fpu);
 		/*
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 2d8f3344875d..0a299468510f 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -925,10 +925,9 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
  * the source data pointer or increment pos, count, kbuf, and ubuf.
  */
 static inline int
-__copy_xstate_to_kernel(unsigned int pos, unsigned int count,
-			void *kbuf,
-			const void *data, const int start_pos,
-			const int end_pos)
+__copy_xstate_to_kernel(void *kbuf,
+			const void *data,
+			unsigned int pos, unsigned int count, const int start_pos, const int end_pos)
 {
 	if ((count == 0) || (pos < start_pos))
 		return 0;
@@ -948,7 +947,7 @@ __copy_xstate_to_kernel(unsigned int pos, unsigned int count,
  * It supports partial copy but pos always starts from zero. This is called
  * from xstateregs_get() and there we check the CPU has XSAVES.
  */
-int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, struct xregs_state *xsave)
+int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
 {
 	unsigned int offset, size;
 	int ret, i;
@@ -973,7 +972,7 @@ int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, stru
 	offset = offsetof(struct xregs_state, header);
 	size = sizeof(header);
 
-	ret = __copy_xstate_to_kernel(offset, size, kbuf, &header, 0, count);
+	ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, 0, count);
 	if (ret)
 		return ret;
 
@@ -987,7 +986,7 @@ int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, stru
 			offset = xstate_offsets[i];
 			size = xstate_sizes[i];
 
-			ret = __copy_xstate_to_kernel(offset, size, kbuf, src, 0, count);
+			ret = __copy_xstate_to_kernel(kbuf, src, offset, size, 0, count);
 			if (ret)
 				return ret;
 
@@ -1003,7 +1002,7 @@ int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, stru
 	offset = offsetof(struct fxregs_state, sw_reserved);
 	size = sizeof(xstate_fx_sw_bytes);
 
-	ret = __copy_xstate_to_kernel(offset, size, kbuf, xstate_fx_sw_bytes, 0, count);
+	ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, 0, count);
 	if (ret)
 		return ret;
 
@@ -1011,7 +1010,7 @@ int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, stru
 }
 
 static inline int
-__copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, const void *data, const int start_pos, const int end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, const int start_pos, const int end_pos)
 {
 	if ((count == 0) || (pos < start_pos))
 		return 0;
@@ -1031,7 +1030,7 @@ __copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, c
  * zero. This is called from xstateregs_get() and there we check the CPU
  * has XSAVES.
  */
-int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, struct xregs_state *xsave)
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
 {
 	unsigned int offset, size;
 	int ret, i;
@@ -1056,7 +1055,7 @@ int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf,
 	offset = offsetof(struct xregs_state, header);
 	size = sizeof(header);
 
-	ret = __copy_xstate_to_user(offset, size, ubuf, &header, 0, count);
+	ret = __copy_xstate_to_user(ubuf, &header, offset, size, 0, count);
 	if (ret)
 		return ret;
 
@@ -1070,7 +1069,7 @@ int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf,
 			offset = xstate_offsets[i];
 			size = xstate_sizes[i];
 
-			ret = __copy_xstate_to_user(offset, size, ubuf, src, 0, count);
+			ret = __copy_xstate_to_user(ubuf, src, offset, size, 0, count);
 			if (ret)
 				return ret;
 
@@ -1086,7 +1085,7 @@ int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf,
 	offset = offsetof(struct fxregs_state, sw_reserved);
 	size = sizeof(xstate_fx_sw_bytes);
 
-	ret = __copy_xstate_to_user(offset, size, ubuf, xstate_fx_sw_bytes, 0, count);
+	ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, 0, count);
 	if (ret)
 		return ret;
 
-- 
2.11.0