From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Date: Tue, 22 Nov 2022 12:10:53 +0530
Subject: selftests/powerpc: Bump up rlimit for perf-hwbreak test
Git-commit: 616ad3f4aac287c48b66c92cb777395b4465ed4f
Patch-mainline: v6.2-rc1
References: bsc#1206232

The systemwide perf hardware breakpoint test tries to open a perf event
on each cpu. On large systems, we run out of file descriptors and fail
the test. Instead, have the test set the file descriptor limit to an
arbitraty high value.

Reported-by: Rohan Deshpande <rohan_d@linux.vnet.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/187fed5843cecc1e5066677b6296ee88337d7bef.1669096083.git.naveen.n.rao@linux.vnet.ibm.com

Signed-off-by: Tony Jones <tonyj@suse.de>
---
 tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
index ea5e14ecbf30..866e5be48ee3 100644
--- a/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
+++ b/tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
@@ -26,6 +26,7 @@
 #include <sys/ioctl.h>
 #include <sys/wait.h>
 #include <sys/ptrace.h>
+#include <sys/resource.h>
 #include <sys/sysinfo.h>
 #include <asm/ptrace.h>
 #include <elf.h>
@@ -140,8 +141,19 @@ static void disable_fds(int *fd, int n)
 
 static int perf_systemwide_event_open(int *fd, __u32 type, __u64 addr, __u64 len)
 {
+	struct rlimit rlim;
 	int i = 0;
 
+	if (getrlimit(RLIMIT_NOFILE, &rlim)) {
+		perror("getrlimit");
+		return -1;
+	}
+	rlim.rlim_cur = 65536;
+	if (setrlimit(RLIMIT_NOFILE, &rlim)) {
+		perror("setrlimit");
+		return -1;
+	}
+
 	/* Assume online processors are 0 to nprocs for simplisity */
 	for (i = 0; i < nprocs; i++) {
 		fd[i] = perf_cpu_event_open(i, type, addr, len);