linux-kernel - Re: [PATCH] [RFC V1]s390/perf: fix 'start' address of module's map

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Date:	Wed, 13 Jul 2016 11:07:42 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Songshan Gong <gongss@...ux.vnet.ibm.com>
Cc:	acme@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC V1]s390/perf: fix 'start' address of module's map

On Wed, Jul 13, 2016 at 02:39:13PM +0800, Songshan Gong wrote:
> 
> 
> 在 7/11/2016 8:01 PM, Jiri Olsa 写道:
> > On Mon, Jul 11, 2016 at 07:06:14PM +0800, Songshan Gong wrote:
> > 
> > SNIP
> > 
> > > > 
> > > > we have following functions in tools/lib/api/fs to read
> > > > single number from file, which I assume you do above:
> > > > 
> > > > int sysfs__read_int(const char *entry, int *value);
> > > > int sysfs__read_ull(const char *entry, unsigned long long *value);
> > > > 
> > > > please check if you could use some of them,
> > > > we could add some more generic one if needed
> > > 
> > > It seems infeasible.
> > > Each value in /sys/module/[module name]/sections/.text is a string like
> > > "0x000003ff8130078\n".
> > > But the core function 'strtoull(line, NULL, 10)' in sysfs__read_ull is based
> > > on decimal.
> > > 
> > > Maybe you can introduce a new argument indicating the value is based on hex
> > > or decimal, or binary?
> > 
> > yea we could specify it directly and add something like:
> > 
> >   int filename__read_ull(const char *filename, unsigned long long *value, int base)
> > 
> > plus some other higher layer helpers..
> > 
> > but I wonder if we could use the base 0 (like in the attached patch),
> > the man page says it should be able to detect the base
> > 
> > we'd need to check all the current usage to make sure nothing gets broken
> > 
> > jirka
> > 
> > 
> 
> Since your patch havn't pushed to devel branch, my next version patch will
> still use the origin method to parse value from /sys/.

I'll make/send the change during this week,

jirka