linux-kernel - Re: [PATCH v3 1/2] printk: Add function to return log buffer address and size

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Date:	Mon, 11 Aug 2014 11:13:32 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] printk: Add function to return log buffer
 address and size

On Sat, 2014-08-09 at 11:15 +0530, Vasant Hegde wrote:

> Ben,
>   - This patchset applies cleanly on powerpc next branch.
>   - Andrew Morton suggested to include this patch in powerpc tree.
>     (https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-August/119802.html)
> 

Ok, Andrew, can I have an Ack ?

Cheers,
Ben.

>  include/linux/printk.h |    3 +++
>  kernel/printk/printk.c |   12 ++++++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index 319ff7e..b8c0316 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -10,6 +10,9 @@
>  extern const char linux_banner[];
>  extern const char linux_proc_banner[];
>  
> +extern char *log_buf_addr_get(void);
> +extern u32 log_buf_len_get(void);
> +
>  static inline int printk_get_level(const char *buffer)
>  {
>  	if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index ea2d5f6..d6a984c 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -270,6 +270,18 @@ static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
>  static char *log_buf = __log_buf;
>  static u32 log_buf_len = __LOG_BUF_LEN;
>  
> +/* Return log buffer address */
> +char *log_buf_addr_get(void)
> +{
> +	return log_buf;
> +}
> +
> +/* Return log buffer size */
> +u32 log_buf_len_get(void)
> +{
> +	return log_buf_len;
> +}
> +
>  /* human readable text of the record */
>  static char *log_text(const struct printk_log *msg)
>  {


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