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tools lib api fs: Use base 0 in filename__read_ull

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By using 0 for base, the strtoull() detects the base automatically (see
'man strtoull').

ATM we have just one user of this function, the cpu__get_max_freq
function reading the "cpuinfo_max_freq" sysfs file. It should not get
affected by this change.

Committer note:

This change seems motivated by this discussion:

"[PATCH] [RFC V1]s390/perf: fix 'start' address of module's map"
http://lkml.kernel.org/r/20160711120155.GA29929@krava

I.e. this patches paves the way for filename__read_ull() to be used in a
S/390 related fix.

Signed-off-by: Jiri Olsa <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Songshan Gong <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Jiri Olsa 2016-07-15 09:29:57 +02:00 • committed by Arnaldo Carvalho de Melo
commit db49120a32
1 changed files with 6 additions and 1 deletions
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7
tools/lib/api/fs/fs.c
View file

@ -283,6 +283,11 @@ int filename__read_int(const char *filename, int *value)
return err;
}
/*
* Parses @value out of @filename with strtoull.
* By using 0 for base, the strtoull detects the
* base automatically (see man strtoull).
*/
int filename__read_ull(const char *filename, unsigned long long *value)
{
char line[64];
@ -292,7 +297,7 @@ int filename__read_ull(const char *filename, unsigned long long *value)
return -1;
if (read(fd, line, sizeof(line)) > 0) {
*value = strtoull(line, NULL, 10);
*value = strtoull(line, NULL, 0);
if (*value != ULLONG_MAX)
err = 0;
}