*/char *strnstr(const char *s1, const char *s2, size_t len){	size_t l2; 	l2 = strlen(s2);	if (!l2)		return (char *)s1;	while (len >= l2) {		len--;		if (!memcmp(s1, s2, l2))			return (char *)s1;		s1++;	}	return NULL;}EXPORT_SYMBOL(strnstr);#endif #ifndef __HAVE_ARCH_MEMCHR/** * memchr - Find a character in an area of memory. * @s: The memory area * @c: The byte to search for * @n: The size of the area. * * returns the address of the first occurrence of @c, or %NULL * if @c is not found */void *memchr(const void *s, int c, size_t n){	const unsigned char *p = s;	while (n-- != 0) {        	if ((unsigned char)c == *p++) {			return (void *)(p - 1);		}	}	return NULL;}EXPORT_SYMBOL(memchr);#endif static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes){	while (bytes) {		if (*start != value)			return (void *)start;		start++;		bytes--;	}	return NULL;} /** * memchr_inv - Find an unmatching character in an area of memory. * @start: The memory area * @c: Find a character other than c * @bytes: The size of the area. * * returns the address of the first character other than @c, or %NULL * if the whole buffer contains just @c. */void *memchr_inv(const void *start, int c, size_t bytes){	u8 value = c;	u64 value64;	unsigned int words, prefix; 	if (bytes <= 16)		return check_bytes8(start, value, bytes); 	value64 = value;#if defined(CONFIG_ARCH_HAS_FAST_MULTIPLIER) && BITS_PER_LONG == 64	value64 *= 0x0101010101010101ULL;#elif defined(CONFIG_ARCH_HAS_FAST_MULTIPLIER)	value64 *= 0x01010101;	value64 |= value64 << 32;#else	value64 |= value64 << 8;	value64 |= value64 << 16;	value64 |= value64 << 32;#endif 	prefix = (unsigned long)start % 8;	if (prefix) {		u8 *r; 		prefix = 8 - prefix;		r = check_bytes8(start, value, prefix);		if (r)			return r;		start += prefix;		bytes -= prefix;	} 	words = bytes / 8; 	while (words) {		if (*(u64 *)start != value64)			return check_bytes8(start, value, 8);		start += 8;		words--;	} 	return check_bytes8(start, value, bytes % 8);}EXPORT_SYMBOL(memchr_inv); /** * strreplace - Replace all occurrences of character in string. * @s: The string to operate on. * @old: The character being replaced. * @new: The character @old is replaced with. * * Returns pointer to the nul byte at the end of @s. */char *strreplace(char *s, char old, char new){	for (; *s; ++s)		if (*s == old)			*s = new;	return s;}EXPORT_SYMBOL(strreplace); void fortify_panic(const char *name){	pr_emerg("detected buffer overflow in %s\n", name);	BUG();}EXPORT_SYMBOL(fortify_panic);

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