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

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

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-15-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2017-09-23 14:59:57 +02:00
parent 7b9094c688
commit 6d7f7da553
4 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/fpu/xstate.h
View File

@ -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

4
arch/x86/kernel/fpu/regset.c
View File

@ -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);
}

2
arch/x86/kernel/fpu/signal.c
View File

@ -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);

4
arch/x86/kernel/fpu/xstate.c
View File

@ -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;