Re: [PATCHv3 01/50] kallsyms/printk: Add loglvl to print_ip_sym()

[Dmitry Safonov]

Hi Joe,

On 4/18/20 9:40 PM, Joe Perches wrote:
> On Sat, 2020-04-18 at 21:18 +0100, Dmitry Safonov wrote:
>> print_ip_sym() needs to have a log level parameter to comply with other
>> parts being printed. Otherwise, half of the expected backtrace would be
>> printed and other may be missing with some logging level.
> 
> I'd rather create another extension to %ps that also emits
> the [<address>] along with the symbol lookup and retire
> print_ip_sym altogether.

Makes sense.
Would you mind if I'll do it on the top of these patches?
[not to mix new printk-format with patches those add loglvl parameter]

> 
> Something like:
> ---
>  lib/vsprintf.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 7c488a..8fce8f 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -2072,6 +2072,8 @@ char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
>   * - 'S' For symbolic direct pointers (or function descriptors) with offset
>   * - 's' For symbolic direct pointers (or function descriptors) without offset
>   * - '[Ss]R' as above with __builtin_extract_return_addr() translation
> + * - '[Ss]B' [<address>] and symbolic direct pointers as above
> + *	     (was used previously used as print_ip_sym)
>   * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
>   *	    %ps and %pS. Be careful when re-using these specifiers.
>   * - 'B' For backtraced symbolic direct pointers with offset
> @@ -2183,6 +2185,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
>  	case 'S':
>  	case 's':
>  		ptr = dereference_symbol_descriptor(ptr);
> +		if (fmt[1] == 'B')
> +			buf += vsprintf(buf, end, "[<%px>] ", ptr);
>  		/* Fallthrough */
>  	case 'B':
>  		return symbol_string(buf, end, ptr, spec, fmt);
> 
> 

Thanks,
          Dmitry