linux-kernel - [PATCH net-next] tools/net/ynl: suppress jobserver warning in ynltool version detection

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Message-Id: <20260112-ynl-make-fix-v1-1-c399e76925ad@meta.com>
Date: Mon, 12 Jan 2026 19:56:31 -0800
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Donald Hunter <donald.hunter@...il.com>, 
 Jakub Kicinski <kuba@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bobby Eshleman <bobbyeshleman@...a.com>
Subject: [PATCH net-next] tools/net/ynl: suppress jobserver warning in
 ynltool version detection

From: Bobby Eshleman <bobbyeshleman@...a.com>

When building ynltool with parallel make (-jN), a warning is emitted:

  make[1]: warning: jobserver unavailable: using -j1.
  Add '+' to parent make rule.

The warning trips up local runs of NIPA's ingest_mdir.py, which
correctly fails on make warnings.

This occurs because SRC_VERSION uses $(shell make ...) to make
kernelversion. The $(shell) function inherits make's MAKEFLAGS env var
which specifies "--jobserver-auth=R,W" pointing to file descriptors that
the invoked make sub-shell does not have access to.

Observed with:

$ make --version | head -1
GNU Make 4.3

Instead of suppressing MAKEFLAGS and foregoing all future MAKEFLAGS
(some of which may be desirable, such as variable overrides) or
introducing a new make target, we instead just ignore the warning by
piping stderr to /dev/null. If 'make kernelversion' fails, the ' || echo
"unknown"' phrase will catch the failure.

Before:
	NIPA ingest_mdir.py:

	ynl
	 Full series FAIL   (1)
	   Generated files up to date; build has 1 warnings/errors; no diff in
	   generated;

After:
	NIPA ingest_mdir.py:

	Series level tests:
	 ynl                             OKAY

Validated output:
	$ ./ynltool/ynltool --version
	ynltool 6.19.0-rc4

Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
---
 tools/net/ynl/ynltool/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/net/ynl/ynltool/Makefile b/tools/net/ynl/ynltool/Makefile
index f5b1de32daa5..48b0f32050f0 100644
--- a/tools/net/ynl/ynltool/Makefile
+++ b/tools/net/ynl/ynltool/Makefile
@@ -13,7 +13,7 @@ endif
 CFLAGS += -I../lib -I../generated -I../../../include/uapi/

 SRC_VERSION := \
-	$(shell make --no-print-directory -sC ../../../.. kernelversion || \
+	$(shell make --no-print-directory -sC ../../../.. kernelversion 2>/dev/null || \
 		echo "unknown")

 CFLAGS += -DSRC_VERSION='"$(SRC_VERSION)"'

---
base-commit: 2f2d896ec59a11a9baaa56818466db7a3178c041
change-id: 20260112-ynl-make-fix-c8a3e33c4757

Best regards,
-- 
Bobby Eshleman <bobbyeshleman@...a.com>