From: Andrii Nakryiko <andriin@fb.com>
Date: Sun, 12 Jan 2020 23:31:39 -0800
Subject: libbpf: Clean up bpf_helper_defs.h generation output
Patch-mainline: v5.6-rc1
Git-commit: 292e1d73b125d7a3fd7ff382557e003ece3c0d65
References: bsc#1177028

bpf_helpers_doc.py script, used to generate bpf_helper_defs.h, unconditionally
emits one informational message to stderr. Remove it and preserve stderr to
contain only relevant errors. Also make sure script invocations command is
muted by default in libbpf's Makefile.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200113073143.1779940-3-andriin@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
 scripts/bpf_helpers_doc.py |    2 --
 tools/lib/bpf/Makefile     |    2 +-
 2 files changed, 1 insertion(+), 3 deletions(-)

--- a/scripts/bpf_helpers_doc.py
+++ b/scripts/bpf_helpers_doc.py
@@ -158,8 +158,6 @@ class HeaderParser(object):
                 break
 
         self.reader.close()
-        print('Parsed description of %d helper function(s)' % len(self.helpers),
-              file=sys.stderr)
 
 ###############################################################################
 
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -183,7 +183,7 @@ $(BPF_IN_STATIC): force elfdep zdep bpfd
 	$(Q)$(MAKE) $(build)=libbpf OUTPUT=$(STATIC_OBJDIR)
 
 $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
-	$(Q)$(srctree)/scripts/bpf_helpers_doc.py --header 		\
+	$(QUIET_GEN)$(srctree)/scripts/bpf_helpers_doc.py --header \
 		--file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
 
 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)