linux-kernel - [PATCH 2/2 v2] Only print "Decompressing Linux" etc when 'debug' is passed.

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Date:	Sat, 24 May 2008 23:47:47 -0400
From:	Kristian Høgsberg <krh@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Kristian Høgsberg <krh@...hat.com>
Subject: [PATCH 2/2 v2] Only print "Decompressing Linux" etc when 'debug' is passed.

Signed-off-by: Kristian Høgsberg <krh@...hat.com>
---

Updated to use the standard 'debug' parameter instead of 'noisy'.

 arch/x86/boot/compressed/misc.c |   30 +++++++++++++++++++++++++++---
 1 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 0d03579..017df26 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -190,6 +190,7 @@ static void gzip_release(void **);
  */
 static struct boot_params *real_mode;		/* Pointer to real-mode data */
 static struct screen_info *rm_screen_info;	/* Pointer to real-mode data */
+static int debug;
 
 extern unsigned char input_data[];
 extern int input_len;
@@ -391,7 +392,8 @@ static void parse_elf(void *output)
 		return;
 	}
 
-	putstr("Parsing ELF... ");
+	if (debug)
+		putstr("Parsing ELF... ");
 
 	phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
 	if (!phdrs)
@@ -419,11 +421,27 @@ static void parse_elf(void *output)
 	}
 }
 
+static const char *strnstr(const char *string, int len, const char *s)
+{
+	int i, j;
+
+	for (i = 0; i < len; i++) {
+		for (j = 0; i + j < len && s[j]; j++)
+			if (string[i + j] != s[j])
+				break;
+		if (s[j] == '\0')
+			return string + i;
+	}
+
+	return NULL;
+}
 asmlinkage void decompress_kernel(void *rmode, memptr heap,
 				  unsigned char *input_data,
 				  unsigned long input_len,
 				  unsigned char *output)
 {
+	char *cmdline;
+
 	real_mode = rmode;
 
 	if (rm_screen_info->orig_video_mode == 7) {
@@ -437,6 +455,10 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 	lines = rm_screen_info->orig_video_lines;
 	cols = rm_screen_info->orig_video_cols;
 
+	cmdline = (char *) real_mode->hdr.cmd_line_ptr;
+	if (strnstr(cmdline, real_mode->hdr.cmdline_size, "debug"))
+		debug = 1;
+
 	window = output;		/* Output buffer (Normally at 1M) */
 	free_mem_ptr     = heap;	/* Heap */
 	free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
@@ -461,9 +483,11 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 #endif
 
 	makecrc();
-	putstr("\nDecompressing Linux... ");
+	if (debug)
+		putstr("\nDecompressing Linux... ");
 	gunzip();
 	parse_elf(output);
-	putstr("done.\nBooting the kernel.\n");
+	if (debug)
+		putstr("done.\nBooting the kernel.\n");
 	return;
 }
-- 
1.5.5.1

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