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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@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121453.924266705@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-06-23 14:01:53 +02:00 committed by Borislav Petkov
parent b16313f71c
commit 6b862ba182
2 changed files with 4 additions and 4 deletions
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4
arch/x86/include/asm/fpu/internal.h
View File

@ -326,7 +326,7 @@ static inline void os_xrstor(struct xregs_state *xstate, u64 mask)
* 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;
@ -351,7 +351,7 @@ static inline int copy_xregs_to_user(struct xregs_state __user *buf)
/*
* 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;

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

@ -129,7 +129,7 @@ static inline int copy_fpregs_to_sigframe(struct xregs_state __user *buf)
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
@ -266,7 +266,7 @@ static int copy_user_to_fpregs_zeroing(void __user *buf, u64 xbv, int fx_only)
} 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))
os_xrstor(&init_fpstate.xsave, init_bv);
return r;