linux-kernel - [PATCH v2] scripts/link-vmlinux.sh: force error on kallsyms failure

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Date:	Fri,  5 Feb 2016 11:25:05 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux@...ck-us.net, arnd@...db.de, mmarek@...e.cz
Cc:	rusty@...tcorp.com.au, Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH v2] scripts/link-vmlinux.sh: force error on kallsyms failure

Since the output of the invocation of scripts/kallsyms is piped directly
into the assembler, error messages it emits are visible on stderr, but
a non-zero return code is ignored, and the build simply proceeds in that
case. However, the resulting kernel is most likely broken, and will crash
at boot.

So instead, capture the output of kallsyms in a separate .S file, and pass
that to the assembler in a separate step.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 scripts/link-vmlinux.sh | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index b83f918c7830..4846ecb9764c 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -93,9 +93,10 @@ kallsyms()
 	local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
 		      ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
 
-	${NM} -n ${1} | \
-		scripts/kallsyms ${kallsymopt} | \
-		${CC} ${aflags} -c -o ${2} -x assembler-with-cpp -
+	local afile="`basename ${2} .o`.S"
+
+	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
+	${CC} ${aflags} -c -o ${2} ${afile}
 }
 
 # Create map file with all symbols from ${1}
-- 
2.5.0