From: Masahiro Yamada <masahiroy@kernel.org>
Date: Wed, 7 Aug 2024 18:03:00 +0000 (+0900)
Subject: kbuild: avoid scripts/kallsyms parsing /dev/null
X-Git-Tag: v6.10.7~124
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7adc1123d285f83c97a7a568b28829e1b5873954;p=thirdparty%2Fkernel%2Fstable.git

kbuild: avoid scripts/kallsyms parsing /dev/null

[ Upstream commit 1472464c6248575bf2d01c7f076b94704bb32c95 ]

On macOS, as reported by Daniel Gomez, getline() sets ENOTTY to errno
if it is requested to read from /dev/null.

If this is worth fixing, I would rather pass an empty file to
scripts/kallsyms instead of adding the ugly #ifdef __APPLE__.

Fixes: c442db3f49f2 ("kbuild: remove PROVIDE() for kallsyms symbols")
Reported-by: Daniel Gomez <da.gomez@samsung.com>
Closes: https://lore.kernel.org/all/20240807-macos-build-support-v1-12-4cd1ded85694@samsung.com/
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Reviewed-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 22d0bc8439863..070a319140e89 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -215,7 +215,8 @@ kallsymso=
 strip_debug=
 
 if is_enabled CONFIG_KALLSYMS; then
-	kallsyms /dev/null .tmp_vmlinux0.kallsyms
+	truncate -s0 .tmp_vmlinux.kallsyms0.syms
+	kallsyms .tmp_vmlinux.kallsyms0.syms .tmp_vmlinux0.kallsyms
 fi
 
 if is_enabled CONFIG_KALLSYMS || is_enabled CONFIG_DEBUG_INFO_BTF; then