- real update for .35

[packages/kernel.git] / kernel-squashfs-lzma.patch

diff -Nru a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
--- a/fs/squashfs/decompressor.c	2010-05-16 23:17:36.000000000 +0200
+++ b/fs/squashfs/decompressor.c	2010-05-17 14:57:45.271547099 +0200
@@ -50,7 +50,11 @@
 
 static const struct squashfs_decompressor *decompressor[] = {
 	&squashfs_zlib_comp_ops,
+#ifdef CONFIG_SQUASHFS_LZMA
+	&squashfs_lzma_comp_ops,
+#else
 	&squashfs_lzma_unsupported_comp_ops,
+#endif
 	&squashfs_lzo_unsupported_comp_ops,
 	&squashfs_unknown_comp_ops
 };
diff -Nru a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
--- a/fs/squashfs/Kconfig	2010-05-16 23:17:36.000000000 +0200
+++ b/fs/squashfs/Kconfig	2010-05-17 15:13:49.807545765 +0200
@@ -26,6 +26,12 @@
 
 	  If unsure, say N.
 
+config SQUASHFS_LZMA
+	bool "Include support for LZMA compressed file systems"
+	depends on SQUASHFS
+	select DECOMPRESS_LZMA
+	select DECOMPRESS_LZMA_NEEDED
+
 config SQUASHFS_EMBEDDED
 
 	bool "Additional option for memory-constrained systems" 
diff -Nru a/fs/squashfs/lzma_wrapper.c b/fs/squashfs/lzma_wrapper.c
--- a/fs/squashfs/lzma_wrapper.c	1970-01-01 01:00:00.000000000 +0100
+++ b/fs/squashfs/lzma_wrapper.c	2010-05-17 15:15:12.637552661 +0200
@@ -0,0 +1,152 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ * Phillip Lougher <phillip@lougher.demon.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * lzma_wrapper.c
+ */
+
+#include <asm/unaligned.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+#include <linux/mutex.h>
+#include <linux/vmalloc.h>
+#include <linux/decompress/unlzma.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+#include "decompressor.h"
+
+struct squashfs_lzma {
+	void	*input;
+	void	*output;
+};
+
+/* decompress_unlzma.c is currently non re-entrant... */
+DEFINE_MUTEX(lzma_mutex);
+
+/* decompress_unlzma.c doesn't provide any context in its callbacks... */
+static int lzma_error;
+
+static void error(char *m)
+{
+	ERROR("unlzma error: %s\n", m);
+	lzma_error = 1;
+}
+
+
+static void *lzma_init(struct squashfs_sb_info *msblk)
+{
+	struct squashfs_lzma *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+	if (stream == NULL)
+		goto failed;
+	stream->input = vmalloc(msblk->block_size);
+	if (stream->input == NULL)
+		goto failed;
+	stream->output = vmalloc(msblk->block_size);
+	if (stream->output == NULL)
+		goto failed2;
+
+	return stream;
+
+failed2:
+	vfree(stream->input);
+failed:
+	ERROR("failed to allocate lzma workspace\n");
+	kfree(stream);
+	return NULL;
+}
+
+
+static void lzma_free(void *strm)
+{
+	struct squashfs_lzma *stream = strm;
+
+	if (stream) {
+		vfree(stream->input);
+		vfree(stream->output);
+	}
+	kfree(stream);
+}
+
+
+static int lzma_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+	struct buffer_head **bh, int b, int offset, int length, int srclength,
+	int pages)
+{
+	struct squashfs_lzma *stream = msblk->stream;
+	void *buff = stream->input;
+	int avail, i, bytes = length, res;
+
+	mutex_lock(&lzma_mutex);
+
+	for (i = 0; i < b; i++) {
+		wait_on_buffer(bh[i]);
+		if (!buffer_uptodate(bh[i]))
+			goto block_release;
+
+		avail = min(bytes, msblk->devblksize - offset);
+		memcpy(buff, bh[i]->b_data + offset, avail);
+		buff += avail;
+		bytes -= avail;
+		offset = 0;
+		put_bh(bh[i]);
+	}
+
+	lzma_error = 0;
+	res = unlzma(stream->input, length, NULL, NULL, stream->output, NULL,
+							error);
+	if (res || lzma_error)
+		goto failed;
+
+	/* uncompressed size is stored in the LZMA header (5 byte offset) */
+	res = bytes = get_unaligned_le32(stream->input + 5);
+	for (i = 0, buff = stream->output; bytes && i < pages; i++) {
+		avail = min_t(int, bytes, PAGE_CACHE_SIZE);
+		memcpy(buffer[i], buff, avail);
+		buff += avail;
+		bytes -= avail;
+	}
+	if (bytes)
+		goto failed;
+
+	mutex_unlock(&lzma_mutex);
+	return res;
+
+block_release:
+	for (; i < b; i++)
+		put_bh(bh[i]);
+
+failed:
+	mutex_unlock(&lzma_mutex);
+
+	ERROR("lzma decompression failed, data probably corrupt\n");
+	return -EIO;
+}
+
+const struct squashfs_decompressor squashfs_lzma_comp_ops = {
+	.init = lzma_init,
+	.free = lzma_free,
+	.decompress = lzma_uncompress,
+	.id = LZMA_COMPRESSION,
+	.name = "lzma",
+	.supported = 1
+};
+
diff -Nru a/fs/squashfs/Makefile b/fs/squashfs/Makefile
--- a/fs/squashfs/Makefile	2010-05-16 23:17:36.000000000 +0200
+++ b/fs/squashfs/Makefile	2010-05-17 14:57:45.270554026 +0200
@@ -6,4 +6,4 @@
 squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
 squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
 squashfs-$(CONFIG_SQUASHFS_XATTRS) += xattr.o xattr_id.o
-
+squashfs-$(CONFIG_SQUASHFS_LZMA) += lzma_wrapper.o
diff -Nru a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
--- a/fs/squashfs/squashfs.h	2010-05-16 23:17:36.000000000 +0200
+++ b/fs/squashfs/squashfs.h	2010-05-17 14:57:45.310795600 +0200
@@ -94,3 +94,6 @@
 
 /* zlib_wrapper.c */
 extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
+
+/* lzma wrapper.c */
+extern const struct squashfs_decompressor squashfs_lzma_comp_ops;
diff -Nru a/include/linux/decompress/bunzip2_mm.h b/include/linux/decompress/bunzip2_mm.h
--- a/include/linux/decompress/bunzip2_mm.h	1970-01-01 01:00:00.000000000 +0100
+++ b/include/linux/decompress/bunzip2_mm.h	2010-05-17 15:14:15.255545839 +0200
@@ -0,0 +1,13 @@
+#ifndef BUNZIP2_MM_H
+#define BUNZIP2_MM_H
+
+#ifdef STATIC
+/* Code active when included from pre-boot environment: */
+#define INIT
+#else
+/* Compile for initramfs/initrd code only */
+#define INIT __init
+static void(*error)(char *m);
+#endif
+
+#endif
diff -Nru a/include/linux/decompress/inflate_mm.h b/include/linux/decompress/inflate_mm.h
--- a/include/linux/decompress/inflate_mm.h	1970-01-01 01:00:00.000000000 +0100
+++ b/include/linux/decompress/inflate_mm.h	2010-05-17 15:14:15.255545839 +0200
@@ -0,0 +1,13 @@
+#ifndef INFLATE_MM_H
+#define INFLATE_MM_H
+
+#ifdef STATIC
+/* Code active when included from pre-boot environment: */
+#define INIT
+#else
+/* Compile for initramfs/initrd code only */
+#define INIT __init
+static void(*error)(char *m);
+#endif
+
+#endif
diff -Nru a/include/linux/decompress/mm.h b/include/linux/decompress/mm.h
--- a/include/linux/decompress/mm.h	2010-05-16 23:17:36.000000000 +0200
+++ b/include/linux/decompress/mm.h	2010-05-17 15:14:15.259546209 +0200
@@ -63,8 +63,6 @@
 
 #define set_error_fn(x)
 
-#define INIT
-
 #else /* STATIC */
 
 /* Code active when compiled standalone for use when loading ramdisk: */
@@ -84,10 +82,8 @@
 #define large_malloc(a) vmalloc(a)
 #define large_free(a) vfree(a)
 
-static void(*error)(char *m);
 #define set_error_fn(x) error = x;
 
-#define INIT __init
 #define STATIC
 
 #include <linux/init.h>
diff -Nru a/include/linux/decompress/unlzma_mm.h b/include/linux/decompress/unlzma_mm.h
--- a/include/linux/decompress/unlzma_mm.h	1970-01-01 01:00:00.000000000 +0100
+++ b/include/linux/decompress/unlzma_mm.h	2010-05-17 15:13:10.802553245 +0200
@@ -0,0 +1,20 @@
+#ifndef UNLZMA_MM_H
+#define UNLZMA_MM_H
+
+#ifdef STATIC
+
+/* Code active when included from pre-boot environment: */
+#define INIT
+
+#elif defined(CONFIG_DECOMPRESS_LZMA_NEEDED)
+
+/* Make it available to non initramfs/initrd code */
+#define INIT
+#include <linux/module.h>
+#else
+
+/* Compile for initramfs/initrd code only */
+#define INIT __init
+#endif
+
+#endif
diff -Nru a/include/linux/decompress/unlzo_mm.h b/include/linux/decompress/unlzo_mm.h
--- a/include/linux/decompress/unlzo_mm.h	1970-01-01 01:00:00.000000000 +0100
+++ b/include/linux/decompress/unlzo_mm.h	2010-05-17 15:14:15.259546209 +0200
@@ -0,0 +1,13 @@
+#ifndef UNLZO_MM_H
+#define UNLZO_MM_H
+
+#ifdef STATIC
+/* Code active when included from pre-boot environment: */
+#define INIT
+#else
+/* Compile for initramfs/initrd code only */
+#define INIT __init
+static void(*error)(char *m);
+#endif
+
+#endif
diff -Nru a/lib/decompress_bunzip2.c b/lib/decompress_bunzip2.c
--- a/lib/decompress_bunzip2.c	2010-05-16 23:17:36.000000000 +0200
+++ b/lib/decompress_bunzip2.c	2010-05-17 15:13:10.812574144 +0200
@@ -52,6 +52,7 @@
 #include <linux/slab.h>
 #endif /* STATIC */
 
+#include <linux/decompress/bunzip2_mm.h>
 #include <linux/decompress/mm.h>
 
 #ifndef INT_MAX
diff -Nru a/lib/decompress_inflate.c b/lib/decompress_inflate.c
--- a/lib/decompress_inflate.c	2010-05-16 23:17:36.000000000 +0200
+++ b/lib/decompress_inflate.c	2010-05-17 15:13:10.815573687 +0200
@@ -23,6 +23,7 @@
 
 #endif /* STATIC */
 
+#include <linux/decompress/inflate_mm.h>
 #include <linux/decompress/mm.h>
 
 #define GZIP_IOBUF_SIZE (16*1024)
diff -Nru a/lib/decompress_unlzma.c b/lib/decompress_unlzma.c
--- a/lib/decompress_unlzma.c	2010-05-16 23:17:36.000000000 +0200
+++ b/lib/decompress_unlzma.c	2010-05-17 15:14:15.260574202 +0200
@@ -36,6 +36,7 @@
 #include <linux/slab.h>
 #endif /* STATIC */
 
+#include <linux/decompress/unlzma_mm.h>
 #include <linux/decompress/mm.h>
 
 #define	MIN(a, b) (((a) < (b)) ? (a) : (b))
@@ -88,7 +89,7 @@
 }
 
 /* Called twice: once at startup and once in rc_normalize() */
-static void INIT rc_read(struct rc *rc)
+static void INIT rc_read(struct rc *rc, void(*error)(char *x))
 {
 	rc->buffer_size = rc->fill((char *)rc->buffer, LZMA_IOBUF_SIZE);
 	if (rc->buffer_size <= 0)
@@ -115,13 +116,13 @@
 	rc->range = 0xFFFFFFFF;
 }
 
-static inline void INIT rc_init_code(struct rc *rc)
+static inline void INIT rc_init_code(struct rc *rc, void(*error)(char *x))
 {
 	int i;
 
 	for (i = 0; i < 5; i++) {
 		if (rc->ptr >= rc->buffer_end)
-			rc_read(rc);
+			rc_read(rc, error);
 		rc->code = (rc->code << 8) | *rc->ptr++;
 	}
 }
@@ -134,32 +135,33 @@
 }
 
 /* Called twice, but one callsite is in inline'd rc_is_bit_0_helper() */
-static void INIT rc_do_normalize(struct rc *rc)
+static void INIT rc_do_normalize(struct rc *rc, void(*error)(char *x))
 {
 	if (rc->ptr >= rc->buffer_end)
-		rc_read(rc);
+		rc_read(rc, error);
 	rc->range <<= 8;
 	rc->code = (rc->code << 8) | *rc->ptr++;
 }
-static inline void INIT rc_normalize(struct rc *rc)
+static inline void INIT rc_normalize(struct rc *rc, void(*error)(char *x))
 {
 	if (rc->range < (1 << RC_TOP_BITS))
-		rc_do_normalize(rc);
+		rc_do_normalize(rc, error);
 }
 
 /* Called 9 times */
 /* Why rc_is_bit_0_helper exists?
  *Because we want to always expose (rc->code < rc->bound) to optimizer
  */
-static inline uint32_t INIT rc_is_bit_0_helper(struct rc *rc, uint16_t *p)
+static inline uint32_t INIT rc_is_bit_0_helper(struct rc *rc, uint16_t *p,
+						void (*error)(char *x))
 {
-	rc_normalize(rc);
+	rc_normalize(rc, error);
 	rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
 	return rc->bound;
 }
-static inline int INIT rc_is_bit_0(struct rc *rc, uint16_t *p)
+static inline int INIT rc_is_bit_0(struct rc *rc, uint16_t *p, void(*error)(char *x))
 {
-	uint32_t t = rc_is_bit_0_helper(rc, p);
+	uint32_t t = rc_is_bit_0_helper(rc, p, error);
 	return rc->code < t;
 }
 
@@ -177,9 +179,9 @@
 }
 
 /* Called 4 times in unlzma loop */
-static int INIT rc_get_bit(struct rc *rc, uint16_t *p, int *symbol)
+static int INIT rc_get_bit(struct rc *rc, uint16_t *p, int *symbol, void(*error)(char *x))
 {
-	if (rc_is_bit_0(rc, p)) {
+	if (rc_is_bit_0(rc, p, error)) {
 		rc_update_bit_0(rc, p);
 		*symbol *= 2;
 		return 0;
@@ -191,9 +193,9 @@
 }
 
 /* Called once */
-static inline int INIT rc_direct_bit(struct rc *rc)
+static inline int INIT rc_direct_bit(struct rc *rc , void(*error)(char *x))
 {
-	rc_normalize(rc);
+	rc_normalize(rc, error);
 	rc->range >>= 1;
 	if (rc->code >= rc->range) {
 		rc->code -= rc->range;
@@ -204,13 +206,14 @@
 
 /* Called twice */
 static inline void INIT
-rc_bit_tree_decode(struct rc *rc, uint16_t *p, int num_levels, int *symbol)
+rc_bit_tree_decode(struct rc *rc, uint16_t *p, int num_levels, int *symbol,
+							void(*error)(char *x))
 {
 	int i = num_levels;
 
 	*symbol = 1;
 	while (i--)
-		rc_get_bit(rc, p + *symbol, symbol);
+		rc_get_bit(rc, p + *symbol, symbol, error);
 	*symbol -= 1 << num_levels;
 }
 
@@ -347,7 +350,8 @@
 static inline void INIT process_bit0(struct writer *wr, struct rc *rc,
 				     struct cstate *cst, uint16_t *p,
 				     int pos_state, uint16_t *prob,
-				     int lc, uint32_t literal_pos_mask) {
+				     int lc, uint32_t literal_pos_mask,
+				     void(*error)(char *x)) {
 	int mi = 1;
 	rc_update_bit_0(rc, prob);
 	prob = (p + LZMA_LITERAL +
@@ -365,7 +369,7 @@
 			match_byte <<= 1;
 			bit = match_byte & 0x100;
 			prob_lit = prob + 0x100 + bit + mi;
-			if (rc_get_bit(rc, prob_lit, &mi)) {
+			if (rc_get_bit(rc, prob_lit, &mi, error)) {
 				if (!bit)
 					break;
 			} else {
@@ -376,7 +380,7 @@
 	}
 	while (mi < 0x100) {
 		uint16_t *prob_lit = prob + mi;
-		rc_get_bit(rc, prob_lit, &mi);
+		rc_get_bit(rc, prob_lit, &mi, error);
 	}
 	write_byte(wr, mi);
 	if (cst->state < 4)
@@ -389,7 +393,8 @@
 
 static inline void INIT process_bit1(struct writer *wr, struct rc *rc,
 					    struct cstate *cst, uint16_t *p,
-					    int pos_state, uint16_t *prob) {
+					    int pos_state, uint16_t *prob,
+					    void(*error)(char *x)) {
   int offset;
 	uint16_t *prob_len;
 	int num_bits;
@@ -397,7 +402,7 @@
 
 	rc_update_bit_1(rc, prob);
 	prob = p + LZMA_IS_REP + cst->state;
-	if (rc_is_bit_0(rc, prob)) {
+	if (rc_is_bit_0(rc, prob, error)) {
 		rc_update_bit_0(rc, prob);
 		cst->rep3 = cst->rep2;
 		cst->rep2 = cst->rep1;
@@ -407,13 +412,13 @@
 	} else {
 		rc_update_bit_1(rc, prob);
 		prob = p + LZMA_IS_REP_G0 + cst->state;
-		if (rc_is_bit_0(rc, prob)) {
+		if (rc_is_bit_0(rc, prob, error)) {
 			rc_update_bit_0(rc, prob);
 			prob = (p + LZMA_IS_REP_0_LONG
 				+ (cst->state <<
 				   LZMA_NUM_POS_BITS_MAX) +
 				pos_state);
-			if (rc_is_bit_0(rc, prob)) {
+			if (rc_is_bit_0(rc, prob, error)) {
 				rc_update_bit_0(rc, prob);
 
 				cst->state = cst->state < LZMA_NUM_LIT_STATES ?
@@ -428,13 +433,13 @@
 
 			rc_update_bit_1(rc, prob);
 			prob = p + LZMA_IS_REP_G1 + cst->state;
-			if (rc_is_bit_0(rc, prob)) {
+			if (rc_is_bit_0(rc, prob, error)) {
 				rc_update_bit_0(rc, prob);
 				distance = cst->rep1;
 			} else {
 				rc_update_bit_1(rc, prob);
 				prob = p + LZMA_IS_REP_G2 + cst->state;
-				if (rc_is_bit_0(rc, prob)) {
+				if (rc_is_bit_0(rc, prob, error)) {
 					rc_update_bit_0(rc, prob);
 					distance = cst->rep2;
 				} else {
@@ -452,7 +457,7 @@
 	}
 
 	prob_len = prob + LZMA_LEN_CHOICE;
-	if (rc_is_bit_0(rc, prob_len)) {
+	if (rc_is_bit_0(rc, prob_len, error)) {
 		rc_update_bit_0(rc, prob_len);
 		prob_len = (prob + LZMA_LEN_LOW
 			    + (pos_state <<
@@ -462,7 +467,7 @@
 	} else {
 		rc_update_bit_1(rc, prob_len);
 		prob_len = prob + LZMA_LEN_CHOICE_2;
-		if (rc_is_bit_0(rc, prob_len)) {
+		if (rc_is_bit_0(rc, prob_len, error)) {
 			rc_update_bit_0(rc, prob_len);
 			prob_len = (prob + LZMA_LEN_MID
 				    + (pos_state <<
@@ -478,7 +483,7 @@
 		}
 	}
 
-	rc_bit_tree_decode(rc, prob_len, num_bits, &len);
+	rc_bit_tree_decode(rc, prob_len, num_bits, &len, error);
 	len += offset;
 
 	if (cst->state < 4) {
@@ -493,7 +498,7 @@
 			 << LZMA_NUM_POS_SLOT_BITS);
 		rc_bit_tree_decode(rc, prob,
 				   LZMA_NUM_POS_SLOT_BITS,
-				   &pos_slot);
+				   &pos_slot, error);
 		if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
 			int i, mi;
 			num_bits = (pos_slot >> 1) - 1;
@@ -506,7 +511,7 @@
 				num_bits -= LZMA_NUM_ALIGN_BITS;
 				while (num_bits--)
 					cst->rep0 = (cst->rep0 << 1) |
-						rc_direct_bit(rc);
+						rc_direct_bit(rc, error);
 				prob = p + LZMA_ALIGN;
 				cst->rep0 <<= LZMA_NUM_ALIGN_BITS;
 				num_bits = LZMA_NUM_ALIGN_BITS;
@@ -514,7 +519,7 @@
 			i = 1;
 			mi = 1;
 			while (num_bits--) {
-				if (rc_get_bit(rc, prob + mi, &mi))
+				if (rc_get_bit(rc, prob + mi, &mi, error))
 					cst->rep0 |= i;
 				i <<= 1;
 			}
@@ -531,12 +536,12 @@
 
 
 
-STATIC inline int INIT unlzma(unsigned char *buf, int in_len,
+STATIC int INIT unlzma(unsigned char *buf, int in_len,
 			      int(*fill)(void*, unsigned int),
 			      int(*flush)(void*, unsigned int),
 			      unsigned char *output,
 			      int *posp,
-			      void(*error_fn)(char *x)
+			      void(*error)(char *x)
 	)
 {
 	struct lzma_header header;
@@ -552,8 +557,6 @@
 	unsigned char *inbuf;
 	int ret = -1;
 
-	set_error_fn(error_fn);
-
 	if (buf)
 		inbuf = buf;
 	else
@@ -576,7 +579,7 @@
 
 	for (i = 0; i < sizeof(header); i++) {
 		if (rc.ptr >= rc.buffer_end)
-			rc_read(&rc);
+			rc_read(&rc, error);
 		((unsigned char *)&header)[i] = *rc.ptr++;
 	}
 
@@ -621,17 +624,17 @@
 	for (i = 0; i < num_probs; i++)
 		p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
 
-	rc_init_code(&rc);
+	rc_init_code(&rc, error);
 
 	while (get_pos(&wr) < header.dst_size) {
 		int pos_state =	get_pos(&wr) & pos_state_mask;
 		uint16_t *prob = p + LZMA_IS_MATCH +
 			(cst.state << LZMA_NUM_POS_BITS_MAX) + pos_state;
-		if (rc_is_bit_0(&rc, prob))
+		if (rc_is_bit_0(&rc, prob, error))
 			process_bit0(&wr, &rc, &cst, p, pos_state, prob,
-				     lc, literal_pos_mask);
+				     lc, literal_pos_mask, error);
 		else {
-			process_bit1(&wr, &rc, &cst, p, pos_state, prob);
+			process_bit1(&wr, &rc, &cst, p, pos_state, prob, error);
 			if (cst.rep0 == 0)
 				break;
 		}
@@ -652,6 +655,9 @@
 exit_0:
 	return ret;
 }
+#if defined(CONFIG_DECOMPRESS_LZMA_NEEDED) && !defined(PREBOOT)
+EXPORT_SYMBOL(unlzma);
+#endif
 
 #ifdef PREBOOT
 STATIC int INIT decompress(unsigned char *buf, int in_len,
diff -Nru a/lib/decompress_unlzo.c b/lib/decompress_unlzo.c
--- a/lib/decompress_unlzo.c	2010-05-16 23:17:36.000000000 +0200
+++ b/lib/decompress_unlzo.c	2010-05-17 15:13:10.820554001 +0200
@@ -39,6 +39,7 @@
 
 #include <linux/types.h>
 #include <linux/lzo.h>
+#include <linux/decompress/unlzo_mm.h>
 #include <linux/decompress/mm.h>
 
 #include <linux/compiler.h>
diff -Nru a/lib/Kconfig b/lib/Kconfig
--- a/lib/Kconfig	2010-05-16 23:17:36.000000000 +0200
+++ b/lib/Kconfig	2010-05-17 15:13:10.809574529 +0200
@@ -121,6 +121,9 @@
 	select LZO_DECOMPRESS
 	tristate
 
+config DECOMPRESS_LZMA_NEEDED
+	 boolean
+
 #
 # Generic allocator support is selected if needed
 #
diff -Nru a/lib/Makefile b/lib/Makefile
--- a/lib/Makefile	2010-05-16 23:17:36.000000000 +0200
+++ b/lib/Makefile	2010-05-17 15:14:36.312796051 +0200
@@ -69,7 +69,7 @@
 
 lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
 lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
-lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
+obj-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
 lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
 
 obj-$(CONFIG_TEXTSEARCH) += textsearch.o