diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/string.c | 27 | ||||
| -rw-r--r-- | lib/zlib_inflate/inffast.c | 32 |
2 files changed, 56 insertions, 3 deletions
diff --git a/lib/string.c b/lib/string.c index 9f75b4ec50b..a1cdcfcc42d 100644 --- a/lib/string.c +++ b/lib/string.c @@ -667,7 +667,7 @@ EXPORT_SYMBOL(memscan); */ char *strstr(const char *s1, const char *s2) { - int l1, l2; + size_t l1, l2; l2 = strlen(s2); if (!l2) @@ -684,6 +684,31 @@ char *strstr(const char *s1, const char *s2) EXPORT_SYMBOL(strstr); #endif +#ifndef __HAVE_ARCH_STRNSTR +/** + * strnstr - Find the first substring in a length-limited string + * @s1: The string to be searched + * @s2: The string to search for + * @len: the maximum number of characters to search + */ +char *strnstr(const char *s1, const char *s2, size_t len) +{ + size_t l1 = len, l2; + + l2 = strlen(s2); + if (!l2) + return (char *)s1; + while (l1 >= l2) { + l1--; + 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. diff --git a/lib/zlib_inflate/inffast.c b/lib/zlib_inflate/inffast.c index 05e1559fa15..215447c5526 100644 --- a/lib/zlib_inflate/inffast.c +++ b/lib/zlib_inflate/inffast.c @@ -4,12 +4,25 @@ */ #include <linux/zutil.h> -#include <asm/unaligned.h> -#include <asm/byteorder.h> #include "inftrees.h" #include "inflate.h" #include "inffast.h" +/* Only do the unaligned "Faster" variant when + * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is set + * + * On powerpc, it won't be as we don't include autoconf.h + * automatically for the boot wrapper, which is intended as + * we run in an environment where we may not be able to deal + * with (even rare) alignment faults. In addition, we do not + * define __KERNEL__ for arch/powerpc/boot unlike x86 + */ + +#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS +#include <asm/unaligned.h> +#include <asm/byteorder.h> +#endif + #ifndef ASMINF /* Allow machine dependent optimization for post-increment or pre-increment. @@ -243,6 +256,7 @@ void inflate_fast(z_streamp strm, unsigned start) } } else { +#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS unsigned short *sout; unsigned long loops; @@ -284,6 +298,20 @@ void inflate_fast(z_streamp strm, unsigned start) } if (len & 1) PUP(out) = PUP(from); +#else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */ + from = out - dist; /* copy direct from output */ + do { /* minimum length is three */ + PUP(out) = PUP(from); + PUP(out) = PUP(from); + PUP(out) = PUP(from); + len -= 3; + } while (len > 2); + if (len) { + PUP(out) = PUP(from); + if (len > 1) + PUP(out) = PUP(from); + } +#endif /* !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */ } } else if ((op & 64) == 0) { /* 2nd level distance code */ |