4.4-stable review patch. If anyone has any objections, please let me know.
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From: Jiri Olsa jolsa@kernel.org
[ Upstream commit 89d0aeab4252adc2a7ea693637dd21c588bfa2d1 ]
The stdio perf top crashes when we change the terminal window size. The reason is that we assumed we get the perf_top pointer as a signal handler argument which is not the case.
Changing the SIGWINCH handler logic to change global resize variable, which is checked in the main thread loop.
Signed-off-by: Jiri Olsa jolsa@kernel.org Tested-by: Arnaldo Carvalho de Melo acme@redhat.com Tested-by: Ravi Bangoria ravi.bangoria@linux.vnet.ibm.com Cc: Adrian Hunter adrian.hunter@intel.com Cc: Andi Kleen andi@firstfloor.org Cc: David Ahern dsahern@gmail.com Cc: Namhyung Kim namhyung@kernel.org Cc: Wang Nan wangnan0@huawei.com Link: http://lkml.kernel.org/n/tip-ysuzwz77oev1ftgvdscn9bpu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/builtin-top.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
--- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -70,6 +70,7 @@ #include <linux/types.h>
static volatile int done; +static volatile int resize;
#define HEADER_LINE_NR 5
@@ -79,10 +80,13 @@ static void perf_top__update_print_entri }
static void perf_top__sig_winch(int sig __maybe_unused, - siginfo_t *info __maybe_unused, void *arg) + siginfo_t *info __maybe_unused, void *arg __maybe_unused) { - struct perf_top *top = arg; + resize = 1; +}
+static void perf_top__resize(struct perf_top *top) +{ get_term_dimensions(&top->winsize); perf_top__update_print_entries(top); } @@ -466,7 +470,7 @@ static bool perf_top__handle_keypress(st .sa_sigaction = perf_top__sig_winch, .sa_flags = SA_SIGINFO, }; - perf_top__sig_winch(SIGWINCH, NULL, top); + perf_top__resize(top); sigaction(SIGWINCH, &act, NULL); } else { signal(SIGWINCH, SIG_DFL); @@ -1023,6 +1027,11 @@ static int __cmd_top(struct perf_top *to
if (hits == top->samples) ret = perf_evlist__poll(top->evlist, 100); + + if (resize) { + perf_top__resize(top); + resize = 0; + } }
ret = 0;