linux-kernel - [PATCH 05/11] xz: Fix comments and coding style

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Date: Wed, 20 Mar 2024 20:38:38 +0200
From: Lasse Collin <lasse.collin@...aani.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Lasse Collin <lasse.collin@...aani.org>,
	Jia Tan <jiat0218@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/11] xz: Fix comments and coding style

- Update the URL of the .xz file format specification.
- Fix comments that were no longer in sync with the code below them.
- Fix language errors.
- Fix coding style.

Reviewed-by: Jia Tan <jiat0218@...il.com>
Signed-off-by: Lasse Collin <lasse.collin@...aani.org>
---
 lib/decompress_unxz.c | 20 ++++++++++----------
 lib/xz/Kconfig        |  3 ++-
 lib/xz/xz_stream.h    |  2 +-
 scripts/Makefile.lib  | 13 ++++++++-----
 4 files changed, 21 insertions(+), 17 deletions(-)

diff --git a/lib/decompress_unxz.c b/lib/decompress_unxz.c
index 34bb7efc0412..46aa3be13fc5 100644
--- a/lib/decompress_unxz.c
+++ b/lib/decompress_unxz.c
@@ -102,7 +102,7 @@
 #ifdef STATIC
 #	define XZ_PREBOOT
 #else
-#include <linux/decompress/unxz.h>
+#	include <linux/decompress/unxz.h>
 #endif
 #ifdef __KERNEL__
 #	include <linux/decompress/mm.h>
@@ -219,7 +219,7 @@ void *memmove(void *dest, const void *src, size_t size)
 #endif
 
 /*
- * Since we need memmove anyway, would use it as memcpy too.
+ * Since we need memmove anyway, we could use it as memcpy too.
  * Commented out for now to avoid breaking things.
  */
 /*
@@ -389,17 +389,17 @@ STATIC int INIT unxz(unsigned char *in, long in_size,
 }
 
 /*
- * This macro is used by architecture-specific files to decompress
+ * This function is used by architecture-specific files to decompress
  * the kernel image.
  */
 #ifdef XZ_PREBOOT
-STATIC int INIT __decompress(unsigned char *buf, long len,
-			   long (*fill)(void*, unsigned long),
-			   long (*flush)(void*, unsigned long),
-			   unsigned char *out_buf, long olen,
-			   long *pos,
-			   void (*error)(char *x))
+STATIC int INIT __decompress(unsigned char *in, long in_size,
+			     long (*fill)(void *dest, unsigned long size),
+			     long (*flush)(void *src, unsigned long size),
+			     unsigned char *out, long out_size,
+			     long *in_used,
+			     void (*error)(char *x))
 {
-	return unxz(buf, len, fill, flush, out_buf, pos, error);
+	return unxz(in, in_size, fill, flush, out, in_used, error);
 }
 #endif
diff --git a/lib/xz/Kconfig b/lib/xz/Kconfig
index aef086a6bf2f..6b80453d8f54 100644
--- a/lib/xz/Kconfig
+++ b/lib/xz/Kconfig
@@ -5,7 +5,8 @@ config XZ_DEC
 	help
 	  LZMA2 compression algorithm and BCJ filters are supported using
 	  the .xz file format as the container. For integrity checking,
-	  CRC32 is supported. See Documentation/staging/xz.rst for more information.
+	  CRC32 is supported. See Documentation/staging/xz.rst for more
+	  information.
 
 if XZ_DEC
 
diff --git a/lib/xz/xz_stream.h b/lib/xz/xz_stream.h
index 55f9f6f94b78..242500bd025d 100644
--- a/lib/xz/xz_stream.h
+++ b/lib/xz/xz_stream.h
@@ -18,7 +18,7 @@
 
 /*
  * See the .xz file format specification at
- * https://tukaani.org/xz/xz-file-format.txt
+ * https://xz.tukaani.org/format/xz-file-format.txt
  * to understand the container format.
  */
 
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 1bd59b8db05f..986c79c5af89 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -500,14 +500,17 @@ quiet_cmd_uimage = UIMAGE  $@
 
 # XZ
 # ---------------------------------------------------------------------------
-# Use xzkern to compress the kernel image and xzmisc to compress other things.
+# Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to
+# compress other things.
 #
 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 # of the kernel decompressor. A BCJ filter is used if it is available for
-# the target architecture. xzkern also appends uncompressed size of the data
-# using size_append. The .xz format has the size information available at
-# the end of the file too, but it's in more complex format and it's good to
-# avoid changing the part of the boot code that reads the uncompressed size.
+# the target architecture.
+#
+# xzkern_with_size also appends uncompressed size of the data using
+# size_append. The .xz format has the size information available at the end
+# of the file too, but it's in more complex format and it's good to avoid
+# changing the part of the boot code that reads the uncompressed size.
 # Note that the bytes added by size_append will make the xz tool think that
 # the file is corrupt. This is expected.
 #
-- 
2.44.0