bzip2/lzma: fix built-in initramfs vs CONFIG_RD_GZIP

Impact: Resolves build failures in some configurations

Makes it possible to disable CONFIG_RD_GZIP . In that case, the
built-in initramfs will be compressed by whatever compressor is
available (bzip2 or lzma) or left uncompressed if none is available.

It also removes a couple of warnings which occur when no ramdisk
compression at all is chosen.

It also restores the select ZLIB_INFLATE in drivers/block/Kconfig
which somehow came missing. This is needed to activate compilation of
the stuff in zlib_deflate.

Signed-off-by: Alain Knaff <alain@knaff.lu>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/init/initramfs.c b/init/initramfs.c
index 40bd4fb95788..a3ba91cdab89 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -389,7 +389,7 @@ static int __init write_buffer(char *buf, unsigned len)
         return len - count;
 }
 
-
+#if defined CONFIG_RD_GZIP || defined CONFIG_RD_BZIP2 || defined CONFIG_RD_LZMA
 static int __init flush_buffer(void *bufv, unsigned len)
 {
         char *buf = (char *) bufv;
@@ -412,6 +412,7 @@ static int __init flush_buffer(void *bufv, unsigned len)
         }
         return origLen;
 }
+#endif
 
 static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
 
@@ -449,10 +450,12 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
                         continue;
                 }
                 this_header = 0;
+#ifdef CONFIG_RD_GZIP
                 if (!gunzip(buf, len, NULL, flush_buffer, NULL,
                             &my_inptr, error) &&
                     message == NULL)
                         goto ok;
+#endif
 
 #ifdef CONFIG_RD_BZIP2
                 message = NULL; /* Zero out message, or else cpio will
@@ -473,7 +476,9 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
                         goto ok;
                 }
 #endif
+#if defined CONFIG_RD_GZIP || defined CONFIG_RD_BZIP2 || defined CONFIG_RD_LZMA
 ok:
+#endif
                 if (state != Reset)
                         error("junk in compressed archive");
                 this_header = saved_offset + my_inptr;