[v8,6/6] powerpc/fadump: use the new parse_args callback arguments

Message ID 4fabdf584ad18d6aae61e331f783a5020567f634.1505231820.git.msuchanek@suse.de
State New
Headers show
Series
  • [v8,1/6] powerpc/fadump: reduce memory consumption for capture kernel
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Commit Message

Michal Suchánek Sept. 12, 2017, 4:01 p.m.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/kernel/fadump.c | 47 ++++++++++++--------------------------------
 1 file changed, 13 insertions(+), 34 deletions(-)

Comments

Hari Bathini Sept. 29, 2017, 1 p.m. | #1
In case, someone wishes for a changelog:


With fadump_rework_cmdline_params() function, parse_args() callback 
function,

taking new arguments - current & next, use them to process 
'fadump_extra_args='

parmeter, in enforcing the parameters passed through it for fadump kernel.


On Tuesday 12 September 2017 09:31 PM, Michal Suchanek wrote:
> Signed-off-by: Michal Suchanek <msuchanek@suse.de>
> ---
>   arch/powerpc/kernel/fadump.c | 47 ++++++++++++--------------------------------
>   1 file changed, 13 insertions(+), 34 deletions(-)
>
> diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
> index 8778e1cc0380..1678d99ea835 100644
> --- a/arch/powerpc/kernel/fadump.c
> +++ b/arch/powerpc/kernel/fadump.c
> @@ -481,33 +481,19 @@ struct param_info {
>   };
>
>   static void __init fadump_update_params(struct param_info *param_info,
> -					char *param, char *val)
> +					char *param, char *val,
> +					char *currant, char *next)
>   {
> -	ptrdiff_t param_offset = param - param_info->tmp_cmdline;
> +	ptrdiff_t param_offset = currant - param_info->tmp_cmdline;
>   	size_t vallen = val ? strlen(val) : 0;
>   	char *tgt = param_info->cmdline + param_offset
>   				- param_info->shortening;
> -	int shortening = 0;
> -	int quoted = 0;
> +	int shortening = ((next - 1) - (currant))
> +		- (FADUMP_EXTRA_ARGS_LEN + 1 + vallen);
>
>   	if (!val)
>   		return;
>
> -	/* leading '"' removed from parameter */
> -	if ((param > param_info->tmp_cmdline) && *(param - 1) == '"') {
> -		quoted = 1;
> -		shortening += 1;
> -		tgt--;
> -	}
> -
> -	/* next_arg removes one leading and one trailing '"' */
> -	if ((*(tgt + FADUMP_EXTRA_ARGS_LEN + 1 + vallen + shortening) == '"') &&
> -	    (quoted || (*(tgt + FADUMP_EXTRA_ARGS_LEN + 1) == '"'))) {
> -		shortening += 1;
> -		if (!quoted)
> -			shortening += 1;
> -	}
> -
>   	/* remove one leading and one trailing quote if both are present */
>   	if ((val[0] == '"') && (val[vallen - 1] == '"')) {
>   		shortening += 2;
> @@ -515,22 +501,15 @@ static void __init fadump_update_params(struct param_info *param_info,
>   		val++;
>   	}
>
> -	/* some characters were removed - move the trailing part of cmdline */
> -	if (shortening) {
> -		char *src;
> +	strncpy(tgt, FADUMP_EXTRA_ARGS_PARAM, FADUMP_EXTRA_ARGS_LEN);
> +	tgt += FADUMP_EXTRA_ARGS_LEN;
> +	*tgt++ = ' ';
> +	strncpy(tgt, val, vallen);
> +	tgt += vallen;
>
> -		strncpy(tgt, FADUMP_EXTRA_ARGS_PARAM, FADUMP_EXTRA_ARGS_LEN);
> -		tgt += FADUMP_EXTRA_ARGS_LEN;
> -		*tgt++ = ' ';
> -
> -		strncpy(tgt, val, vallen);
> -		tgt += vallen;
> -
> -		src = tgt + shortening;
> +	if (shortening) {
> +		char *src = tgt + shortening;
>   		memmove(tgt, src, strlen(src) + 1);
> -	} else {
> -		/* remove the '=' */
> -		*(tgt + FADUMP_EXTRA_ARGS_LEN) = ' ';
>   	}
>
>   	param_info->shortening += shortening;
> @@ -550,7 +529,7 @@ static int __init fadump_rework_cmdline_params(char *param, char *val,
>   		     strlen(FADUMP_EXTRA_ARGS_PARAM) - 1))
>   		return 0;
>
> -	fadump_update_params(param_info, param, val);
> +	fadump_update_params(param_info, param, val, currant, next);
>
>   	return 0;
>   }


Thanks
Hari

Patch

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 8778e1cc0380..1678d99ea835 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -481,33 +481,19 @@  struct param_info {
 };
 
 static void __init fadump_update_params(struct param_info *param_info,
-					char *param, char *val)
+					char *param, char *val,
+					char *currant, char *next)
 {
-	ptrdiff_t param_offset = param - param_info->tmp_cmdline;
+	ptrdiff_t param_offset = currant - param_info->tmp_cmdline;
 	size_t vallen = val ? strlen(val) : 0;
 	char *tgt = param_info->cmdline + param_offset
 				- param_info->shortening;
-	int shortening = 0;
-	int quoted = 0;
+	int shortening = ((next - 1) - (currant))
+		- (FADUMP_EXTRA_ARGS_LEN + 1 + vallen);
 
 	if (!val)
 		return;
 
-	/* leading '"' removed from parameter */
-	if ((param > param_info->tmp_cmdline) && *(param - 1) == '"') {
-		quoted = 1;
-		shortening += 1;
-		tgt--;
-	}
-
-	/* next_arg removes one leading and one trailing '"' */
-	if ((*(tgt + FADUMP_EXTRA_ARGS_LEN + 1 + vallen + shortening) == '"') &&
-	    (quoted || (*(tgt + FADUMP_EXTRA_ARGS_LEN + 1) == '"'))) {
-		shortening += 1;
-		if (!quoted)
-			shortening += 1;
-	}
-
 	/* remove one leading and one trailing quote if both are present */
 	if ((val[0] == '"') && (val[vallen - 1] == '"')) {
 		shortening += 2;
@@ -515,22 +501,15 @@  static void __init fadump_update_params(struct param_info *param_info,
 		val++;
 	}
 
-	/* some characters were removed - move the trailing part of cmdline */
-	if (shortening) {
-		char *src;
+	strncpy(tgt, FADUMP_EXTRA_ARGS_PARAM, FADUMP_EXTRA_ARGS_LEN);
+	tgt += FADUMP_EXTRA_ARGS_LEN;
+	*tgt++ = ' ';
+	strncpy(tgt, val, vallen);
+	tgt += vallen;
 
-		strncpy(tgt, FADUMP_EXTRA_ARGS_PARAM, FADUMP_EXTRA_ARGS_LEN);
-		tgt += FADUMP_EXTRA_ARGS_LEN;
-		*tgt++ = ' ';
-
-		strncpy(tgt, val, vallen);
-		tgt += vallen;
-
-		src = tgt + shortening;
+	if (shortening) {
+		char *src = tgt + shortening;
 		memmove(tgt, src, strlen(src) + 1);
-	} else {
-		/* remove the '=' */
-		*(tgt + FADUMP_EXTRA_ARGS_LEN) = ' ';
 	}
 
 	param_info->shortening += shortening;
@@ -550,7 +529,7 @@  static int __init fadump_rework_cmdline_params(char *param, char *val,
 		     strlen(FADUMP_EXTRA_ARGS_PARAM) - 1))
 		return 0;
 
-	fadump_update_params(param_info, param, val);
+	fadump_update_params(param_info, param, val, currant, next);
 
 	return 0;
 }