linux-stable/tools/build/feature/test-file-handle.c
Namhyung Kim 49f550ea87 perf tools: Add file-handle feature test
The file handle (FHANDLE) support is configurable so some systems might not
have it.  So add a config feature item to check it on build time so that we
don't add the cgroup tracking feature based on that.

Committer notes:

Had to make the test use the same construct as its later use in
synthetic-events.c, in the next patch in this series. i.e. make it be:

	struct {
		struct file_handle fh;
		uint64_t cgroup_id;
	} handle;

To cope with:

    CC       /tmp/build/perf/util/cloexec.o
  util/synthetic-events.c:428:22: error: field 'fh' with   CC       /tmp/build/perf/util/call-path.o
  variable sized type 'struct file_handle' not at the end of a struct or class is a GNU
        extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
                  struct file_handle fh;
                                     ^
  1 error generated.

Deal with this at some point, i.e. investigate if the right thing is to
remove that -Wgnu-variable-sized-type-not-at-end from our CFLAGS, for
now do the test the same way as it is used looks more sensible.

Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200402015249.3800462-1-namhyung@kernel.org
[ split from a larger patch, removed blank line at EOF ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-04-03 09:37:55 -03:00

17 lines
282 B
C

#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <inttypes.h>
int main(void)
{
struct {
struct file_handle fh;
uint64_t cgroup_id;
} handle;
int mount_id;
name_to_handle_at(AT_FDCWD, "/", &handle.fh, &mount_id, 0);
return 0;
}