linux-kernel - [PATCH] scripts: dummy-tools, add pahole

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Date:   Thu, 14 Apr 2022 11:14:19 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     masahiroy@...nel.org
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org
Subject: [PATCH] scripts: dummy-tools, add pahole

CONFIG_PAHOLE_VERSION is a part of a config since the commit below. And
when multiple people update the config, this value constantly changes.
Even if they use dummy scripts.

To fix this:
* add a pahole dummy script returning v99.99 -> 9999
* call it in Makefile taking CROSS_COMPILE into account.

The latter happens only if $(CROSS_COMPILE)pahole really exists. This is
because a cross pahole likely exists only in dummy tools now, not in
real cross tools.

Fixes: 613fe1692377 (kbuild: Add CONFIG_PAHOLE_VERSION)
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michal Marek <michal.lkml@...kovi.net>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: linux-kbuild@...r.kernel.org
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 Makefile                   | 2 +-
 scripts/dummy-tools/pahole | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100755 scripts/dummy-tools/pahole

diff --git a/Makefile b/Makefile
index ecbd42f3451a..2ef722ba0a41 100644
--- a/Makefile
+++ b/Makefile
@@ -502,7 +502,7 @@ RUSTFMT		= rustfmt
 CLIPPY_DRIVER	= clippy-driver
 BINDGEN		= bindgen
 CARGO		= cargo
-PAHOLE		= pahole
+PAHOLE		= $(if $(wildcard $(CROSS_COMPILE)pahole),$(CROSS_COMPILE)pahole,pahole)
 RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
 LEX		= flex
 YACC		= bison
diff --git a/scripts/dummy-tools/pahole b/scripts/dummy-tools/pahole
new file mode 100755
index 000000000000..53501a36fa71
--- /dev/null
+++ b/scripts/dummy-tools/pahole
@@ -0,0 +1,4 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+echo v99.99
-- 
2.35.2