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166 lines
4.3 KiB
Diff
166 lines
4.3 KiB
Diff
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From fdf23ed283bc6ef5c25076ce2065f892120ff556 Mon Sep 17 00:00:00 2001
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From: Phillip Lougher <phillip@lougher.demon.co.uk>
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Date: Thu, 22 Oct 2009 04:57:38 +0100
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Subject: [PATCH] Squashfs: Make unlzma available to non initramfs/initrd code
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Add a config option DECOMPRESS_LZMA_NEEDED which allows subsystems to
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specify they need the unlzma code. Normally decompress_unlzma.c is
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compiled with __init and unlzma is not exported to modules.
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Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
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---
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fs/squashfs/Kconfig | 1 +
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include/linux/decompress/bunzip2_mm.h | 12 ++++++++++++
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include/linux/decompress/inflate_mm.h | 12 ++++++++++++
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include/linux/decompress/mm.h | 3 ---
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include/linux/decompress/unlzma_mm.h | 20 ++++++++++++++++++++
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lib/Kconfig | 3 +++
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lib/decompress_bunzip2.c | 1 +
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lib/decompress_inflate.c | 1 +
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lib/decompress_unlzma.c | 5 ++++-
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9 files changed, 54 insertions(+), 4 deletions(-)
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create mode 100644 include/linux/decompress/bunzip2_mm.h
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create mode 100644 include/linux/decompress/inflate_mm.h
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create mode 100644 include/linux/decompress/unlzma_mm.h
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--- a/fs/squashfs/Kconfig
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+++ b/fs/squashfs/Kconfig
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@@ -30,6 +30,7 @@ config SQUASHFS_LZMA
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bool "Include support for LZMA compressed file systems"
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depends on SQUASHFS
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select DECOMPRESS_LZMA
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+ select DECOMPRESS_LZMA_NEEDED
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config SQUASHFS_EMBEDDED
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--- /dev/null
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+++ b/include/linux/decompress/bunzip2_mm.h
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@@ -0,0 +1,12 @@
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+#ifndef BUNZIP2_MM_H
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+#define BUNZIP2_MM_H
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+
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+#ifdef STATIC
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+/* Code active when included from pre-boot environment: */
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+#define INIT
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+#else
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+/* Compile for initramfs/initrd code only */
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+#define INIT __init
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+#endif
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+
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+#endif
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--- /dev/null
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+++ b/include/linux/decompress/inflate_mm.h
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@@ -0,0 +1,12 @@
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+#ifndef INFLATE_MM_H
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+#define INFLATE_MM_H
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+
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+#ifdef STATIC
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+/* Code active when included from pre-boot environment: */
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+#define INIT
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+#else
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+/* Compile for initramfs/initrd code only */
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+#define INIT __init
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+#endif
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+
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+#endif
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--- a/include/linux/decompress/mm.h
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+++ b/include/linux/decompress/mm.h
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@@ -53,8 +53,6 @@ static void free(void *where)
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#define set_error_fn(x)
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-#define INIT
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-
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#else /* STATIC */
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/* Code active when compiled standalone for use when loading ramdisk: */
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@@ -77,7 +75,6 @@ static void free(void *where)
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static void(*error)(char *m);
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#define set_error_fn(x) error = x;
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-#define INIT __init
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#define STATIC
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#include <linux/init.h>
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--- /dev/null
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+++ b/include/linux/decompress/unlzma_mm.h
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@@ -0,0 +1,20 @@
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+#ifndef UNLZMA_MM_H
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+#define UNLZMA_MM_H
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+
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+#ifdef STATIC
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+
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+/* Code active when included from pre-boot environment: */
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+#define INIT
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+
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+#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
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+
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+/* Make it available to non initramfs/initrd code */
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+#define INIT
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+#include <linux/module.h>
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+#else
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+
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+/* Compile for initramfs/initrd code only */
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+#define INIT __init
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+#endif
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+
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+#endif
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--- a/lib/Kconfig
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+++ b/lib/Kconfig
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@@ -117,6 +117,9 @@ config DECOMPRESS_BZIP2
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config DECOMPRESS_LZMA
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tristate
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+config DECOMPRESS_LZMA_NEEDED
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+ boolean
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+
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#
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# Generic allocator support is selected if needed
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#
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--- a/lib/decompress_bunzip2.c
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+++ b/lib/decompress_bunzip2.c
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@@ -52,6 +52,7 @@
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#include <linux/slab.h>
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#endif /* STATIC */
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+#include <linux/decompress/bunzip2_mm.h>
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#include <linux/decompress/mm.h>
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#ifndef INT_MAX
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--- a/lib/decompress_inflate.c
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+++ b/lib/decompress_inflate.c
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@@ -23,6 +23,7 @@
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#endif /* STATIC */
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+#include <linux/decompress/inflate_mm.h>
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#include <linux/decompress/mm.h>
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#define GZIP_IOBUF_SIZE (16*1024)
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--- a/lib/decompress_unlzma.c
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+++ b/lib/decompress_unlzma.c
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@@ -36,6 +36,7 @@
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#include <linux/slab.h>
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#endif /* STATIC */
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+#include <linux/decompress/unlzma_mm.h>
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#include <linux/decompress/mm.h>
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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@@ -523,7 +524,7 @@ static inline void INIT process_bit1(str
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-STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
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+STATIC int INIT unlzma(unsigned char *buf, int in_len,
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int(*fill)(void*, unsigned int),
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int(*flush)(void*, unsigned int),
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unsigned char *output,
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@@ -656,4 +657,6 @@ STATIC int INIT decompress(unsigned char
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{
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return unlzma(buf, in_len - 4, fill, flush, output, posp, error_fn);
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}
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+#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
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+EXPORT_SYMBOL(unlzma);
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#endif
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