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

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Date:	Fri, 15 Jul 2016 10:27:43 +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 Fri, Jul 15, 2016 at 03:45:24PM +0800, Songshan Gong wrote:
> 
> 
> 在 7/13/2016 5:07 PM, Jiri Olsa 写道:
> > 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,
> > 
> 
> Oh, could you remind me after you've done?
> Thanks a lot.
> 

I posted it this morning, you're CC-ed

jirka