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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-02 14:55:55 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-02 14:56:33 +0200 |
| commit | 65014ab36196f6d86edc9ee23759d6930b9d89a8 (patch) | |
| tree | 4e3a802e3eae688b53f946560fe583d16f4c0c58 /tools/perf | |
| parent | 61562445c80452ec417fb6a6895b991f6c1dd930 (diff) | |
| download | linux-3.10-65014ab36196f6d86edc9ee23759d6930b9d89a8.tar.gz linux-3.10-65014ab36196f6d86edc9ee23759d6930b9d89a8.tar.bz2 linux-3.10-65014ab36196f6d86edc9ee23759d6930b9d89a8.zip | |
perf tools: Work around strict aliasing related warnings
Older versions of GCC are rather stupid about strict aliasing:
util/trace-event-parse.c: In function 'parse_cmdlines':
util/trace-event-parse.c:93: warning: dereferencing type-punned pointer will break strict-aliasing rules
util/trace-event-parse.c: In function 'parse_proc_kallsyms':
util/trace-event-parse.c:155: warning: dereferencing type-punned pointer will break strict-aliasing rules
util/trace-event-parse.c:157: warning: dereferencing type-punned pointer will break strict-aliasing rules
util/trace-event-parse.c:158: warning: dereferencing type-punned pointer will break strict-aliasing rules
util/trace-event-parse.c: In function 'parse_ftrace_printk':
util/trace-event-parse.c:294: warning: dereferencing type-punned pointer will break strict-aliasing rules
util/trace-event-parse.c:295: warning: dereferencing type-punned pointer will break strict-aliasing rules
make: *** [util/trace-event-parse.o] Error 1
Make it clear to GCC that we intend with those pointers, by passing
them through via an explicit (void *) cast.
We might want to add -fno-strict-aliasing as well, like the kernel
itself does.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/trace-event-info.c | 2 | ||||
| -rw-r--r-- | tools/perf/util/trace-event-parse.c | 12 |
2 files changed, 7 insertions, 7 deletions
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c index 81615279b87..6c9302a7274 100644 --- a/tools/perf/util/trace-event-info.c +++ b/tools/perf/util/trace-event-info.c @@ -188,7 +188,7 @@ int bigendian(void) unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0}; unsigned int *ptr; - ptr = (unsigned int *)str; + ptr = (unsigned int *)(void *)str; return *ptr == 0x01020304; } diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c index 665dac20cd1..37b10c2cd3c 100644 --- a/tools/perf/util/trace-event-parse.c +++ b/tools/perf/util/trace-event-parse.c @@ -90,7 +90,7 @@ void parse_cmdlines(char *file, int size __unused) while (line) { item = malloc_or_die(sizeof(*item)); sscanf(line, "%d %as", &item->pid, - (float *)&item->comm); /* workaround gcc warning */ + (float *)(void *)&item->comm); /* workaround gcc warning */ item->next = list; list = item; line = strtok_r(NULL, "\n", &next); @@ -152,10 +152,10 @@ void parse_proc_kallsyms(char *file, unsigned int size __unused) item = malloc_or_die(sizeof(*item)); item->mod = NULL; ret = sscanf(line, "%as %c %as\t[%as", - (float *)&addr_str, /* workaround gcc warning */ + (float *)(void *)&addr_str, /* workaround gcc warning */ &ch, - (float *)&item->func, - (float *)&item->mod); + (float *)(void *)&item->func, + (float *)(void *)&item->mod); item->addr = strtoull(addr_str, NULL, 16); free(addr_str); @@ -291,8 +291,8 @@ void parse_ftrace_printk(char *file, unsigned int size __unused) while (line) { item = malloc_or_die(sizeof(*item)); ret = sscanf(line, "%as : %as", - (float *)&addr_str, /* workaround gcc warning */ - (float *)&item->printk); + (float *)(void *)&addr_str, /* workaround gcc warning */ + (float *)(void *)&item->printk); item->addr = strtoull(addr_str, NULL, 16); free(addr_str); |