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SubjectRe: [PATCH] perf parse-events: Reduce casts around bp_addr
Em Fri, Sep 25, 2020 at 03:01:03PM +0200, Jiri Olsa escreveu:
> On Thu, Sep 24, 2020 at 05:39:03PM -0700, Ian Rogers wrote:
> > perf_event_attr bp_addr is a u64. parse-events.y parses it as a u64, but
> > casts it to a void* and then parse-events.c casts it back to a u64.
> > Rather than all the casts, change the type of the address to be a u64.
> > This removes an issue noted in:
> > https://lore.kernel.org/lkml/20200903184359.GC3495158@kernel.org/
> >
> > Signed-off-by: Ian Rogers <irogers@google.com>
>
> Acked-by: Jiri Olsa <jolsa@redhat.com>


Thanks, applied.

- Arnaldo


> thanks,
> jirka
>
> > ---
> > tools/perf/util/parse-events.c | 4 ++--
> > tools/perf/util/parse-events.h | 2 +-
> > tools/perf/util/parse-events.y | 8 ++++----
> > 3 files changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index 667cbca1547a..f82ef1e840b2 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -940,12 +940,12 @@ do { \
> > }
> >
> > int parse_events_add_breakpoint(struct list_head *list, int *idx,
> > - void *ptr, char *type, u64 len)
> > + u64 addr, char *type, u64 len)
> > {
> > struct perf_event_attr attr;
> >
> > memset(&attr, 0, sizeof(attr));
> > - attr.bp_addr = (unsigned long) ptr;
> > + attr.bp_addr = addr;
> >
> > if (parse_breakpoint_type(type, &attr))
> > return -EINVAL;
> > diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> > index 00cde7d2e30c..e80c9b74f2f2 100644
> > --- a/tools/perf/util/parse-events.h
> > +++ b/tools/perf/util/parse-events.h
> > @@ -190,7 +190,7 @@ int parse_events_add_cache(struct list_head *list, int *idx,
> > struct parse_events_error *error,
> > struct list_head *head_config);
> > int parse_events_add_breakpoint(struct list_head *list, int *idx,
> > - void *ptr, char *type, u64 len);
> > + u64 addr, char *type, u64 len);
> > int parse_events_add_pmu(struct parse_events_state *parse_state,
> > struct list_head *list, char *name,
> > struct list_head *head_config,
> > diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> > index 645bf4f1859f..d5b6aff82f21 100644
> > --- a/tools/perf/util/parse-events.y
> > +++ b/tools/perf/util/parse-events.y
> > @@ -511,7 +511,7 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE ':' PE_MODIFIER_BP sep_dc
> > list = alloc_list();
> > ABORT_ON(!list);
> > err = parse_events_add_breakpoint(list, &parse_state->idx,
> > - (void *)(uintptr_t) $2, $6, $4);
> > + $2, $6, $4);
> > free($6);
> > if (err) {
> > free(list);
> > @@ -528,7 +528,7 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE sep_dc
> > list = alloc_list();
> > ABORT_ON(!list);
> > if (parse_events_add_breakpoint(list, &parse_state->idx,
> > - (void *)(uintptr_t) $2, NULL, $4)) {
> > + $2, NULL, $4)) {
> > free(list);
> > YYABORT;
> > }
> > @@ -544,7 +544,7 @@ PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
> > list = alloc_list();
> > ABORT_ON(!list);
> > err = parse_events_add_breakpoint(list, &parse_state->idx,
> > - (void *)(uintptr_t) $2, $4, 0);
> > + $2, $4, 0);
> > free($4);
> > if (err) {
> > free(list);
> > @@ -561,7 +561,7 @@ PE_PREFIX_MEM PE_VALUE sep_dc
> > list = alloc_list();
> > ABORT_ON(!list);
> > if (parse_events_add_breakpoint(list, &parse_state->idx,
> > - (void *)(uintptr_t) $2, NULL, 0)) {
> > + $2, NULL, 0)) {
> > free(list);
> > YYABORT;
> > }
> > --
> > 2.28.0.681.g6f77f65b4e-goog
> >
>

--

- Arnaldo

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