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x86/fpu: Simplify __copy_xstate_to_kernel() return values

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__copy_xstate_to_kernel() can only return 0 (because kernel copies cannot fail),
simplify the code throughout.

No change in functionality.

Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Eric Biggers <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Yu-cheng Yu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ingo Molnar 2017-09-23 14:59:53 +02:00
commit 8c0817f4a3
1 changed files with 5 additions and 12 deletions
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17
arch/x86/kernel/fpu/xstate.c
View file

@ -924,7 +924,7 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
* This is similar to user_regset_copyout(), but will not add offset to
* the source data pointer or increment pos, count, kbuf, and ubuf.
*/
static inline int
static inline void
__copy_xstate_to_kernel(void *kbuf, const void *data,
unsigned int offset, unsigned int size, unsigned int size_total)
{
@ -933,7 +933,6 @@ __copy_xstate_to_kernel(void *kbuf, const void *data,
memcpy(kbuf + offset, data, copy);
}
return 0;
}
/*
@ -946,8 +945,8 @@ __copy_xstate_to_kernel(void *kbuf, const void *data,
int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
{
unsigned int offset, size;
int ret, i;
struct xstate_header header;
int i;
/*
* Currently copy_regset_to_user() starts from pos 0:
@ -968,9 +967,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
if (ret)
return ret;
__copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
for (i = 0; i < XFEATURE_MAX; i++) {
/*
@ -986,9 +983,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
if (offset + size > size_total)
break;
ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
if (ret)
return ret;
__copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
}
}
@ -999,9 +994,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;
__copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
return 0;
}