Merge branch 'bpf: RLIMIT_MEMLOCK cleanups'

Yafang Shao says:

====================

We have switched to memcg-based memory accouting and thus the rlimit is
not needed any more. LIBBPF_STRICT_AUTO_RLIMIT_MEMLOCK was introduced in
libbpf for backward compatibility, so we can use it instead now.

This patchset cleanups the usage of RLIMIT_MEMLOCK in tools/bpf/,
tools/testing/selftests/bpf and samples/bpf. The file
tools/testing/selftests/bpf/bpf_rlimit.h is removed. The included header
sys/resource.h is removed from many files as it is useless in these files.

- v4: Squash patches and use customary subject prefixes. (Andrii)
- v3: Get rid of bpf_rlimit.h and fix some typos (Andrii)
- v2: Use libbpf_set_strict_mode instead. (Andrii)
- v1: https://lore.kernel.org/bpf/20220320060815.7716-2-laoar.shao@gmail.com/
====================

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

1 files changed, 0 insertions, 28 deletions

diff --git a/tools/testing/selftests/bpf/bpf_rlimit.h b/tools/testing/selftests/bpf/bpf_rlimit.h
deleted file mode 100644
index 9dac9b30f8ef..000000000000
--- a/tools/testing/selftests/bpf/bpf_rlimit.h
+++ /dev/null
@@ -1,28 +0,0 @@
-#include <sys/resource.h>
-#include <stdio.h>
-
-static  __attribute__((constructor)) void bpf_rlimit_ctor(void)
-{
-	struct rlimit rlim_old, rlim_new = {
-		.rlim_cur	= RLIM_INFINITY,
-		.rlim_max	= RLIM_INFINITY,
-	};
-
-	getrlimit(RLIMIT_MEMLOCK, &rlim_old);
-	/* For the sake of running the test cases, we temporarily
-	 * set rlimit to infinity in order for kernel to focus on
-	 * errors from actual test cases and not getting noise
-	 * from hitting memlock limits. The limit is on per-process
-	 * basis and not a global one, hence destructor not really
-	 * needed here.
-	 */
-	if (setrlimit(RLIMIT_MEMLOCK, &rlim_new) < 0) {
-		perror("Unable to lift memlock rlimit");
-		/* Trying out lower limit, but expect potential test
-		 * case failures from this!
-		 */
-		rlim_new.rlim_cur = rlim_old.rlim_cur + (1UL << 20);
-		rlim_new.rlim_max = rlim_old.rlim_max + (1UL << 20);
-		setrlimit(RLIMIT_MEMLOCK, &rlim_new);
-	}
-}