25 lines
647 B
C
25 lines
647 B
C
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/*
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* From code in arch/x86/lib/usercopy_64.c, copied to keep tools/ copy
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* of the kernel's arch/x86/lib/memcpy_64.s used in 'perf bench mem memcpy'
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* happy.
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*/
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#include <linux/types.h>
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unsigned long __memcpy_mcsafe(void *dst, const void *src, size_t cnt);
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unsigned long mcsafe_handle_tail(char *to, char *from, unsigned len);
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unsigned long mcsafe_handle_tail(char *to, char *from, unsigned len)
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{
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for (; len; --len, to++, from++) {
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/*
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* Call the assembly routine back directly since
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* memcpy_mcsafe() may silently fallback to memcpy.
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*/
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unsigned long rem = __memcpy_mcsafe(to, from, 1);
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if (rem)
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break;
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}
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return len;
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}
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