AuxXxilium/linux_dsm_epyc7002
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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fixes from Ingo Molnar:
 "Two last minute tooling fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf probe: Fix perf probe to find correct variable DIE
  perf probe: Fix a segfault if asked for variable it doesn't find
This commit is contained in:
Linus Torvalds 2014-06-05 12:51:05 -07:00
commit 951e273060
2 changed files with 7 additions and 4 deletions
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7
tools/perf/util/dwarf-aux.c
View File

@ -747,14 +747,17 @@ struct __find_variable_param {
static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
{
struct __find_variable_param *fvp = data;
Dwarf_Attribute attr;
int tag;
tag = dwarf_tag(die_mem);
if ((tag == DW_TAG_formal_parameter ||
tag == DW_TAG_variable) &&
die_compare_name(die_mem, fvp->name))
die_compare_name(die_mem, fvp->name) &&
/* Does the DIE have location information or external instance? */
(dwarf_attr(die_mem, DW_AT_external, &attr) ||
dwarf_attr(die_mem, DW_AT_location, &attr)))
return DIE_FIND_CB_END;
if (dwarf_haspc(die_mem, fvp->addr))
return DIE_FIND_CB_CONTINUE;
else

4
tools/perf/util/probe-finder.c
View File

@ -511,12 +511,12 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
&pf->sp_die, pf->tvar);
if (ret == -ENOENT)
if (ret == -ENOENT || ret == -EINVAL)
pr_err("Failed to find the location of %s at this address.\n"
" Perhaps, it has been optimized out.\n", pf->pvar->var);
else if (ret == -ENOTSUP)
pr_err("Sorry, we don't support this variable location yet.\n");
else if (pf->pvar->field) {
else if (ret == 0 && pf->pvar->field) {
ret = convert_variable_fields(vr_die, pf->pvar->var,
pf->pvar->field, &pf->tvar->ref,
&die_mem);