target/linux/generic/patches-2.6.36/007-squashfs_make_lzma_available.patch

   1 From fdf23ed283bc6ef5c25076ce2065f892120ff556 Mon Sep 17 00:00:00 2001
   2 From: Phillip Lougher <phillip@lougher.demon.co.uk>
   3 Date: Thu, 22 Oct 2009 04:57:38 +0100
   4 Subject: [PATCH] Squashfs: Make unlzma available to non initramfs/initrd code
   5
   6 Add a config option DECOMPRESS_LZMA_NEEDED which allows subsystems to
   7 specify they need the unlzma code.  Normally decompress_unlzma.c is
   8 compiled with __init and unlzma is not exported to modules.
   9
  10 Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
  11 ---
  12  fs/squashfs/Kconfig                   |    1 +
  13  include/linux/decompress/bunzip2_mm.h |   12 ++++++++++++
  14  include/linux/decompress/inflate_mm.h |   12 ++++++++++++
  15  include/linux/decompress/mm.h         |    3 ---
  16  include/linux/decompress/unlzma_mm.h  |   20 ++++++++++++++++++++
  17  lib/Kconfig                           |    3 +++
  18  lib/decompress_bunzip2.c              |    1 +
  19  lib/decompress_inflate.c              |    1 +
  20  lib/decompress_unlzma.c               |    5 ++++-
  21  9 files changed, 54 insertions(+), 4 deletions(-)
  22  create mode 100644 include/linux/decompress/bunzip2_mm.h
  23  create mode 100644 include/linux/decompress/inflate_mm.h
  24  create mode 100644 include/linux/decompress/unlzma_mm.h
  25
  26 --- a/fs/squashfs/Kconfig
  27 +++ b/fs/squashfs/Kconfig
  28 @@ -41,6 +41,7 @@ config SQUASHFS_LZMA
  29         bool "Include support for LZMA compressed file systems"
  30         depends on SQUASHFS
  31         select DECOMPRESS_LZMA
  32 +       select DECOMPRESS_LZMA_NEEDED
  33
  34  config SQUASHFS_EMBEDDED
  35
  36 --- /dev/null
  37 +++ b/include/linux/decompress/bunzip2_mm.h
  38 @@ -0,0 +1,12 @@
  39 +#ifndef BUNZIP2_MM_H
  40 +#define BUNZIP2_MM_H
  41 +
  42 +#ifdef STATIC
  43 +/* Code active when included from pre-boot environment: */
  44 +#define INIT
  45 +#else
  46 +/* Compile for initramfs/initrd code only */
  47 +#define INIT __init
  48 +#endif
  49 +
  50 +#endif
  51 --- /dev/null
  52 +++ b/include/linux/decompress/inflate_mm.h
  53 @@ -0,0 +1,12 @@
  54 +#ifndef INFLATE_MM_H
  55 +#define INFLATE_MM_H
  56 +
  57 +#ifdef STATIC
  58 +/* Code active when included from pre-boot environment: */
  59 +#define INIT
  60 +#else
  61 +/* Compile for initramfs/initrd code only */
  62 +#define INIT __init
  63 +#endif
  64 +
  65 +#endif
  66 --- a/include/linux/decompress/mm.h
  67 +++ b/include/linux/decompress/mm.h
  68 @@ -63,8 +63,6 @@ static void free(void *where)
  69
  70  #define set_error_fn(x)
  71
  72 -#define INIT
  73 -
  74  #else /* STATIC */
  75
  76  /* Code active when compiled standalone for use when loading ramdisk: */
  77 @@ -87,7 +85,6 @@ static void free(void *where)
  78  static void(*error)(char *m);
  79  #define set_error_fn(x) error = x;
  80
  81 -#define INIT __init
  82  #define STATIC
  83
  84  #include <linux/init.h>
  85 --- /dev/null
  86 +++ b/include/linux/decompress/unlzma_mm.h
  87 @@ -0,0 +1,20 @@
  88 +#ifndef UNLZMA_MM_H
  89 +#define UNLZMA_MM_H
  90 +
  91 +#ifdef STATIC
  92 +
  93 +/* Code active when included from pre-boot environment: */
  94 +#define INIT
  95 +
  96 +#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
  97 +
  98 +/* Make it available to non initramfs/initrd code */
  99 +#define INIT
 100 +#include <linux/module.h>
 101 +#else
 102 +
 103 +/* Compile for initramfs/initrd code only */
 104 +#define INIT __init
 105 +#endif
 106 +
 107 +#endif
 108 --- a/lib/Kconfig
 109 +++ b/lib/Kconfig
 110 @@ -124,6 +124,9 @@ config DECOMPRESS_LZO
 111         select LZO_DECOMPRESS
 112         tristate
 113
 114 +config DECOMPRESS_LZMA_NEEDED
 115 +        boolean
 116 +
 117  #
 118  # Generic allocator support is selected if needed
 119  #
 120 --- a/lib/decompress_bunzip2.c
 121 +++ b/lib/decompress_bunzip2.c
 122 @@ -52,6 +52,7 @@
 123  #include <linux/slab.h>
 124  #endif /* STATIC */
 125
 126 +#include <linux/decompress/bunzip2_mm.h>
 127  #include <linux/decompress/mm.h>
 128
 129  #ifndef INT_MAX
 130 --- a/lib/decompress_inflate.c
 131 +++ b/lib/decompress_inflate.c
 132 @@ -23,6 +23,7 @@
 133
 134  #endif /* STATIC */
 135
 136 +#include <linux/decompress/inflate_mm.h>
 137  #include <linux/decompress/mm.h>
 138
 139  #define GZIP_IOBUF_SIZE (16*1024)
 140 --- a/lib/decompress_unlzma.c
 141 +++ b/lib/decompress_unlzma.c
 142 @@ -36,6 +36,7 @@
 143  #include <linux/slab.h>
 144  #endif /* STATIC */
 145
 146 +#include <linux/decompress/unlzma_mm.h>
 147  #include <linux/decompress/mm.h>
 148
 149  #define        MIN(a, b) (((a) < (b)) ? (a) : (b))
 150 @@ -531,7 +532,7 @@ static inline void INIT process_bit1(str
 151
 152
 153
 154 -STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
 155 +STATIC int INIT unlzma(unsigned char *buf, int in_len,
 156                               int(*fill)(void*, unsigned int),
 157                               int(*flush)(void*, unsigned int),
 158                               unsigned char *output,
 159 @@ -664,4 +665,6 @@ STATIC int INIT decompress(unsigned char
 160  {
 161         return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn);
 162  }
 163 +#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
 164 +EXPORT_SYMBOL(unlzma);
 165  #endif