[PATCH 1/1] Add kernel parameter for kernel version

[PATCH 1/1] Add kernel parameter for kernel version

[eric.ernst]

From: Eric Ernst <eric.ernst@linux.intel.com>

Create a kernel cmdline parameter, "version_addendum", which can be
used to add text to the kernel version that is reported from
/proc/version.

Signed-off-by: Eric Ernst <eric.ernst@linux.intel.com>
---
 fs/proc/version.c |   14 +++++++++++++-
 init/version.c    |    2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/fs/proc/version.c b/fs/proc/version.c
index d2154eb6d78f..1ea545d471a1 100644
--- a/fs/proc/version.c
+++ b/fs/proc/version.c
@@ -5,12 +5,17 @@
 #include <linux/seq_file.h>
 #include <linux/utsname.h>
 
+#define ADDENDUM_LENGTH 20
+static char version_addendum[ADDENDUM_LENGTH];
+
 static int version_proc_show(struct seq_file *m, void *v)
 {
 	seq_printf(m, linux_proc_banner,
 		utsname()->sysname,
 		utsname()->release,
-		utsname()->version);
+		utsname()->version,
+		version_addendum);
+
 	return 0;
 }
 
@@ -26,6 +31,13 @@ static const struct file_operations version_proc_fops = {
 	.release	= single_release,
 };
 
+static int __init set_version_addendum(char *str)
+{
+	strncpy(version_addendum, str, ADDENDUM_LENGTH);
+	return 0;
+}
+early_param("version_addendum", set_version_addendum);
+
 static int __init proc_version_init(void)
 {
 	proc_create("version", 0, NULL, &version_proc_fops);
diff --git a/init/version.c b/init/version.c
index 1a4718e500fe..180059b69b7a 100644
--- a/init/version.c
+++ b/init/version.c
@@ -47,4 +47,4 @@ const char linux_banner[] =
 const char linux_proc_banner[] =
 	"%s version %s"
 	" (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
-	" (" LINUX_COMPILER ") %s\n";
+	" (" LINUX_COMPILER ") %s " "%s\n";
-- 
1.7.9.5

Re: [PATCH 1/1] Add kernel parameter for kernel version

[Josh Boyer]

On Tue, May 27, 2014 at 3:40 PM,  <eric.ernst@linux.intel.com> wrote:
> From: Eric Ernst <eric.ernst@linux.intel.com>
>
> Create a kernel cmdline parameter, "version_addendum", which can be
> used to add text to the kernel version that is reported from
> /proc/version.

Why?

What is the intended purpose of this and why would someone want to use it?

josh

Re: [PATCH 1/1] Add kernel parameter for kernel version

[Randy Dunlap]

On 05/27/2014 12:48 PM, Josh Boyer wrote:
> On Tue, May 27, 2014 at 3:40 PM,  <eric.ernst@linux.intel.com> wrote:
>> From: Eric Ernst <eric.ernst@linux.intel.com>
>>
>> Create a kernel cmdline parameter, "version_addendum", which can be
>> used to add text to the kernel version that is reported from
>> /proc/version.
> 
> Why?
> 
> What is the intended purpose of this and why would someone want to use it?

and if the patch were to continue to live, it needs a Documentation addition
to kernel-parameters.txt.

-- 
~Randy

Re: [PATCH 1/1] Add kernel parameter for kernel version

[eric ernst]

On 14-05-27 01:06 PM, Randy Dunlap wrote:
> On 05/27/2014 12:48 PM, Josh Boyer wrote:
>> On Tue, May 27, 2014 at 3:40 PM,  <eric.ernst@linux.intel.com> wrote:
>>> From: Eric Ernst <eric.ernst@linux.intel.com>
>>>
>>> Create a kernel cmdline parameter, "version_addendum", which can be
>>> used to add text to the kernel version that is reported from
>>> /proc/version.
>> Why?
>>
>> What is the intended purpose of this and why would someone want to use it?
> and if the patch were to continue to live, it needs a Documentation addition
> to kernel-parameters.txt.
>
Randy - ACK.

Josh - we have a need to keep a single product binary (kernel) across 
multiple android devices.  A subset of these platforms are looking for 
extra versioning information appended to it, accessible via 
/proc/version.  Rather than build multiple otherwise identical kernels 
with only this extended versioning as differentiation, we are looking to 
make this a command line parameter.  Understandable if there isn't 
enough value-add for the community in this patch, but I figured I'd give 
the patch a shot, as we need this functionality locally.  Thanks.

[PATCH v1 1/1] Add kernel parameter for kernel version

[eric.ernst]

From: Eric Ernst <eric.ernst@linux.intel.com>

Create a kernel cmdline parameter, "version_addendum", which can be
used to add text to the kernel version that is reported from
/proc/version.

Signed-off-by: Eric Ernst <eric.ernst@linux.intel.com>
---
 fs/proc/version.c |   14 +++++++++++++-
 init/version.c    |    2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/fs/proc/version.c b/fs/proc/version.c
index d2154eb6d78f..442e69e3eecb 100644
--- a/fs/proc/version.c
+++ b/fs/proc/version.c
@@ -5,12 +5,17 @@
 #include <linux/seq_file.h>
 #include <linux/utsname.h>
 
+#define ADDENDUM_LENGTH 20
+static char version_addendum[ADDENDUM_LENGTH];
+
 static int version_proc_show(struct seq_file *m, void *v)
 {
 	seq_printf(m, linux_proc_banner,
 		utsname()->sysname,
 		utsname()->release,
-		utsname()->version);
+		utsname()->version,
+		version_addendum);
+
 	return 0;
 }
 
@@ -26,6 +31,13 @@ static const struct file_operations version_proc_fops = {
 	.release	= single_release,
 };
 
+static int __init set_version_addendum(char *str)
+{
+	strncpy(version_addendum, str, ADDENDUM_LENGTH-1);
+	return 0;
+}
+early_param("version_addendum", set_version_addendum);
+
 static int __init proc_version_init(void)
 {
 	proc_create("version", 0, NULL, &version_proc_fops);
diff --git a/init/version.c b/init/version.c
index 1a4718e500fe..180059b69b7a 100644
--- a/init/version.c
+++ b/init/version.c
@@ -47,4 +47,4 @@ const char linux_banner[] =
 const char linux_proc_banner[] =
 	"%s version %s"
 	" (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
-	" (" LINUX_COMPILER ") %s\n";
+	" (" LINUX_COMPILER ") %s " "%s\n";
-- 
1.7.9.5

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[eric ernst]

On 14-06-05 03:16 PM, Andrew Morton wrote:
> On Thu,  5 Jun 2014 15:09:17 -0700 eric.ernst@linux.intel.com wrote:
>
>> Create a kernel cmdline parameter, "version_addendum", which can be
>> used to add text to the kernel version that is reported from
>> /proc/version.
> why?
We have a need to keep a single product binary (kernel) across multiple 
android devices.  A subset of these platforms are looking for extra 
versioning information appended to it, accessible via /proc/version.  
Rather than build multiple otherwise identical kernels with only this 
extended versioning as differentiation, we are looking to make this a 
command line parameter.  Understandable if there isn't enough value-add 
for the community in this patch, but I figured I'd give the patch a 
shot, as we need this functionality locally.  Thanks.

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[Andrew Morton]

On Thu,  5 Jun 2014 15:09:17 -0700 eric.ernst@linux.intel.com wrote:

> Create a kernel cmdline parameter, "version_addendum", which can be
> used to add text to the kernel version that is reported from
> /proc/version.

why?

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[eric ernst]

On 14-06-05 03:17 PM, Randy Dunlap wrote:
> On 06/05/2014 03:09 PM, eric.ernst@linux.intel.com wrote:
>> From: Eric Ernst <eric.ernst@linux.intel.com>
>>
>> Create a kernel cmdline parameter, "version_addendum", which can be
>> used to add text to the kernel version that is reported from
>> /proc/version.
> and you still didn't update Documentation/kernel-parameters.txt.
>
Correct - I was waiting for the initial feedback of whether this would 
be useful to community before doing this, sorry for the thrash, Randy.
>> Signed-off-by: Eric Ernst <eric.ernst@linux.intel.com>
>> ---
>>   fs/proc/version.c |   14 +++++++++++++-
>>   init/version.c    |    2 +-
>>   2 files changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/proc/version.c b/fs/proc/version.c
>> index d2154eb6d78f..442e69e3eecb 100644
>> --- a/fs/proc/version.c
>> +++ b/fs/proc/version.c
>> @@ -5,12 +5,17 @@
>>   #include <linux/seq_file.h>
>>   #include <linux/utsname.h>
>>   
>> +#define ADDENDUM_LENGTH 20
>> +static char version_addendum[ADDENDUM_LENGTH];
>> +
>>   static int version_proc_show(struct seq_file *m, void *v)
>>   {
>>   	seq_printf(m, linux_proc_banner,
>>   		utsname()->sysname,
>>   		utsname()->release,
>> -		utsname()->version);
>> +		utsname()->version,
>> +		version_addendum);
>> +
>>   	return 0;
>>   }
>>   
>> @@ -26,6 +31,13 @@ static const struct file_operations version_proc_fops = {
>>   	.release	= single_release,
>>   };
>>   
>> +static int __init set_version_addendum(char *str)
>> +{
>> +	strncpy(version_addendum, str, ADDENDUM_LENGTH-1);
>> +	return 0;
>> +}
>> +early_param("version_addendum", set_version_addendum);
>> +
>>   static int __init proc_version_init(void)
>>   {
>>   	proc_create("version", 0, NULL, &version_proc_fops);
>> diff --git a/init/version.c b/init/version.c
>> index 1a4718e500fe..180059b69b7a 100644
>> --- a/init/version.c
>> +++ b/init/version.c
>> @@ -47,4 +47,4 @@ const char linux_banner[] =
>>   const char linux_proc_banner[] =
>>   	"%s version %s"
>>   	" (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
>> -	" (" LINUX_COMPILER ") %s\n";
>> +	" (" LINUX_COMPILER ") %s " "%s\n";
>>
>

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[Randy Dunlap]

On 06/05/2014 03:09 PM, eric.ernst@linux.intel.com wrote:
> From: Eric Ernst <eric.ernst@linux.intel.com>
> 
> Create a kernel cmdline parameter, "version_addendum", which can be
> used to add text to the kernel version that is reported from
> /proc/version.

and you still didn't update Documentation/kernel-parameters.txt.

> Signed-off-by: Eric Ernst <eric.ernst@linux.intel.com>
> ---
>  fs/proc/version.c |   14 +++++++++++++-
>  init/version.c    |    2 +-
>  2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/proc/version.c b/fs/proc/version.c
> index d2154eb6d78f..442e69e3eecb 100644
> --- a/fs/proc/version.c
> +++ b/fs/proc/version.c
> @@ -5,12 +5,17 @@
>  #include <linux/seq_file.h>
>  #include <linux/utsname.h>
>  
> +#define ADDENDUM_LENGTH 20
> +static char version_addendum[ADDENDUM_LENGTH];
> +
>  static int version_proc_show(struct seq_file *m, void *v)
>  {
>  	seq_printf(m, linux_proc_banner,
>  		utsname()->sysname,
>  		utsname()->release,
> -		utsname()->version);
> +		utsname()->version,
> +		version_addendum);
> +
>  	return 0;
>  }
>  
> @@ -26,6 +31,13 @@ static const struct file_operations version_proc_fops = {
>  	.release	= single_release,
>  };
>  
> +static int __init set_version_addendum(char *str)
> +{
> +	strncpy(version_addendum, str, ADDENDUM_LENGTH-1);
> +	return 0;
> +}
> +early_param("version_addendum", set_version_addendum);
> +
>  static int __init proc_version_init(void)
>  {
>  	proc_create("version", 0, NULL, &version_proc_fops);
> diff --git a/init/version.c b/init/version.c
> index 1a4718e500fe..180059b69b7a 100644
> --- a/init/version.c
> +++ b/init/version.c
> @@ -47,4 +47,4 @@ const char linux_banner[] =
>  const char linux_proc_banner[] =
>  	"%s version %s"
>  	" (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
> -	" (" LINUX_COMPILER ") %s\n";
> +	" (" LINUX_COMPILER ") %s " "%s\n";
> 


-- 
~Randy

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[Randy Dunlap]

On 06/05/2014 03:15 PM, eric ernst wrote:
> 
> On 14-06-05 03:16 PM, Andrew Morton wrote:
>> On Thu,  5 Jun 2014 15:09:17 -0700 eric.ernst@linux.intel.com wrote:
>>
>>> Create a kernel cmdline parameter, "version_addendum", which can be
>>> used to add text to the kernel version that is reported from
>>> /proc/version.
>> why?
> We have a need to keep a single product binary (kernel) across multiple android devices.  A subset of these platforms are looking for extra versioning information appended to it, accessible via /proc/version.  Rather than build multiple otherwise identical kernels with only this extended versioning as differentiation, we are looking to make this a command line parameter.  Understandable if there isn't enough value-add for the community in this patch, but I figured I'd give the patch a shot, as we need this functionality locally.  Thanks.

Please use a newline character every 70-72 characters instead of assuming
that all email programs will break that extra long line up into a readable
format.  (mine does not.)

What software needs to know the version info?  how early does it run?
Could it get the version info from 'uname -r' instead of from /proc/version?

thanks,
-- 
~Randy

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[David Rientjes]

On Thu, 5 Jun 2014, eric ernst wrote:

> We have a need to keep a single product binary (kernel) across multiple
> android devices.  A subset of these platforms are looking for extra versioning
> information appended to it, accessible via /proc/version.  Rather than build
> multiple otherwise identical kernels with only this extended versioning as
> differentiation, we are looking to make this a command line parameter.
> Understandable if there isn't enough value-add for the community in this
> patch, but I figured I'd give the patch a shot, as we need this functionality
> locally.  Thanks.

Unrecognized parameters on the kernel command line are disregarded, so 
your platforms should be able to parse /proc/cmdline for 
version_addendum=foo already.

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[eric ernst]

On 14-06-05 03:29 PM, Randy Dunlap wrote:
> On 06/05/2014 03:15 PM, eric ernst wrote:
>> On 14-06-05 03:16 PM, Andrew Morton wrote:
>>> On Thu,  5 Jun 2014 15:09:17 -0700 eric.ernst@linux.intel.com wrote:
>>>
>>>> Create a kernel cmdline parameter, "version_addendum", which can be
>>>> used to add text to the kernel version that is reported from
>>>> /proc/version.
>>> why?
>> We have a need to keep a single product binary (kernel) across multiple android devices.  A subset of these platforms are looking for extra versioning information appended to it, accessible via /proc/version.  Rather than build multiple otherwise identical kernels with only this extended versioning as differentiation, we are looking to make this a command line parameter.  Understandable if there isn't enough value-add for the community in this patch, but I figured I'd give the patch a shot, as we need this functionality locally.  Thanks.
> Please use a newline character every 70-72 characters instead of assuming
> that all email programs will break that extra long line up into a readable
> format.  (mine does not.)
Ack - sorry Randy - it was a quick cp / paste from earlier in the thread.
>
> What software needs to know the version info?  how early does it run?
> Could it get the version info from 'uname -r' instead of from /proc/version?
>
> thanks,
This'll end up being used by a third party customer for tracking 
particular devices, so I'm sure "much, much later" in user space. While 
I'm sure they could use uname instead, the specific request was for 
/proc/version.

The more I look into this patch, the more I think this is a pretty 
specific use case that probably doesn't have a lot of community 
value-add outside of our scenario.  Thanks for the feedback.

Re: [PATCH v1 1/1] Add kernel parameter for kernel version

[Richard Weinberger]

On Fri, Jun 6, 2014 at 12:56 AM, eric ernst <eric.ernst@linux.intel.com> wrote:
>
> On 14-06-05 03:29 PM, Randy Dunlap wrote:
>>
>> On 06/05/2014 03:15 PM, eric ernst wrote:
>>>
>>> On 14-06-05 03:16 PM, Andrew Morton wrote:
>>>>
>>>> On Thu,  5 Jun 2014 15:09:17 -0700 eric.ernst@linux.intel.com wrote:
>>>>
>>>>> Create a kernel cmdline parameter, "version_addendum", which can be
>>>>> used to add text to the kernel version that is reported from
>>>>> /proc/version.
>>>>
>>>> why?
>>>
>>> We have a need to keep a single product binary (kernel) across multiple
>>> android devices.  A subset of these platforms are looking for extra
>>> versioning information appended to it, accessible via /proc/version.  Rather
>>> than build multiple otherwise identical kernels with only this extended
>>> versioning as differentiation, we are looking to make this a command line
>>> parameter.  Understandable if there isn't enough value-add for the community
>>> in this patch, but I figured I'd give the patch a shot, as we need this
>>> functionality locally.  Thanks.
>>
>> Please use a newline character every 70-72 characters instead of assuming
>> that all email programs will break that extra long line up into a readable
>> format.  (mine does not.)
>
> Ack - sorry Randy - it was a quick cp / paste from earlier in the thread.
>
>>
>> What software needs to know the version info?  how early does it run?
>> Could it get the version info from 'uname -r' instead of from
>> /proc/version?
>>
>> thanks,
>
> This'll end up being used by a third party customer for tracking particular
> devices, so I'm sure "much, much later" in user space. While I'm sure they
> could use uname instead, the specific request was for /proc/version.


sandpuppy:/home/rw # echo "Windows" > /tmp/version
sandpuppy:/home/rw # mount --bind /tmp/version /proc/version
sandpuppy:/home/rw # cat /proc/version
Windows

-- 
Thanks,
//richard