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perf tools: Make find_vdso_map() more modular 

In preparation for checking that the vectors page on the ARM
architecture, refactor the find_vdso_map() function to accept finding an
arbitrary string and create a dedicated helper function for that under
util/find-map.c and update the filename to find-map.c and all references
to it: perf-read-vdso.c and util/vdso.c.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: http://lkml.kernel.org/r/20181221034337.26663-2-f.fainelli@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Florian Fainelli 2018-12-20 19:43:36 -08:00 committed by Arnaldo Carvalho de Melo
parent ac6e022cbf
commit 011532379b
4 changed files with 11 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/perf/Makefile.perf
View File

@ -662,12 +662,12 @@ $(OUTPUT)perf-%: %.o $(PERFLIBS)
$(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $(LDFLAGS) $(filter %.o,$^) $(LIBS)
ifndef NO_PERF_READ_VDSO32
$(OUTPUT)perf-read-vdso32: perf-read-vdso.c util/find-vdso-map.c
$(OUTPUT)perf-read-vdso32: perf-read-vdso.c util/find-map.c
$(QUIET_CC)$(CC) -m32 $(filter -static,$(LDFLAGS)) -Wall -Werror -o $@ perf-read-vdso.c
endif
ifndef NO_PERF_READ_VDSOX32
$(OUTPUT)perf-read-vdsox32: perf-read-vdso.c util/find-vdso-map.c
$(OUTPUT)perf-read-vdsox32: perf-read-vdso.c util/find-map.c
$(QUIET_CC)$(CC) -mx32 $(filter -static,$(LDFLAGS)) -Wall -Werror -o $@ perf-read-vdso.c
endif

6
tools/perf/perf-read-vdso.c
View File

@ -5,17 +5,17 @@
#define VDSO__MAP_NAME "[vdso]"
/*
* Include definition of find_vdso_map() also used in util/vdso.c for
* Include definition of find_map() also used in util/vdso.c for
* building perf.
*/
#include "util/find-vdso-map.c"
#include "util/find-map.c"
int main(void)
{
void *start, *end;
size_t size, written;
if (find_vdso_map(&start, &end))
if (find_map(&start, &end, VDSO__MAP_NAME))
return 1;
size = end - start;

7
tools/perf/util/find-vdso-map.c → tools/perf/util/find-map.c
View File

@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
static int find_vdso_map(void **start, void **end)
static int find_map(void **start, void **end, const char *name)
{
FILE *maps;
char line[128];
@ -7,7 +7,7 @@ static int find_vdso_map(void **start, void **end)
maps = fopen("/proc/self/maps", "r");
if (!maps) {
fprintf(stderr, "vdso: cannot open maps\n");
fprintf(stderr, "cannot open maps\n");
return -1;
}
@ -21,8 +21,7 @@ static int find_vdso_map(void **start, void **end)
if (m < 0)
continue;
if (!strncmp(&line[m], VDSO__MAP_NAME,
sizeof(VDSO__MAP_NAME) - 1))
if (!strncmp(&line[m], name, strlen(name)))
found = 1;
}

6
tools/perf/util/vdso.c
View File

@ -18,10 +18,10 @@
#include "debug.h"
/*
* Include definition of find_vdso_map() also used in perf-read-vdso.c for
* Include definition of find_map() also used in perf-read-vdso.c for
* building perf-read-vdso32 and perf-read-vdsox32.
*/
#include "find-vdso-map.c"
#include "find-map.c"
#define VDSO__TEMP_FILE_NAME "/tmp/perf-vdso.so-XXXXXX"
@ -76,7 +76,7 @@ static char *get_file(struct vdso_file *vdso_file)
if (vdso_file->found)
return vdso_file->temp_file_name;
if (vdso_file->error || find_vdso_map(&start, &end))
if (vdso_file->error || find_map(&start, &end, VDSO__MAP_NAME))
return NULL;
size = end - start;