Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Thomas writes:
  "- Provide a strerror_r wrapper so lib/bpf can be built on systems
     without _GNU_SOURCE
   - Unbreak the man page generator when building out of tree"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf Documentation: Fix out-of-tree asciidoctor man page generation
  tools lib bpf: Provide wrapper for strerror_r to build in !_GNU_SOURCE systems

1 files changed, 18 insertions, 0 deletions

diff --git a/tools/lib/bpf/str_error.c b/tools/lib/bpf/str_error.c
new file mode 100644
index 000000000000..b8798114a357
--- /dev/null
+++ b/tools/lib/bpf/str_error.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: LGPL-2.1
+#undef _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include "str_error.h"
+
+/*
+ * Wrapper to allow for building in non-GNU systems such as Alpine Linux's musl
+ * libc, while checking strerror_r() return to avoid having to check this in
+ * all places calling it.
+ */
+char *str_error(int err, char *dst, int len)
+{
+        int ret = strerror_r(err, dst, len);
+        if (ret)
+                snprintf(dst, len, "ERROR: strerror_r(%d)=%d", err, ret);
+        return dst;
+}