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| author | Grant Likely <grant.likely@secretlab.ca> | 2010-02-02 01:05:22 -0700 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2010-02-02 01:05:22 -0700 |
| commit | fb7899b1f0b748ef966071f5dc23c59ebd57d08f (patch) | |
| tree | 2f13f9d8607871a60334608524e8b4e9447f5309 /lib/zlib_inflate/inffast.c | |
| parent | 212b3c8b8ab94d983c2e0ee1821f17dd5b4e0859 (diff) | |
| parent | abe94c756c08d50566c09a65b9c7fe72f83071c5 (diff) | |
Merge commit 'v2.6.33-rc6' into secretlab/next-spi
Diffstat (limited to 'lib/zlib_inflate/inffast.c')
| -rw-r--r-- | lib/zlib_inflate/inffast.c | 32 |
1 files changed, 30 insertions, 2 deletions
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 */ |