linux-kernel - [PATCH 1/9] kbuild: Require gcc-9 for s390

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Message-ID: <20251209121701.1856271-2-hca@linux.ibm.com>
Date: Tue,  9 Dec 2025 13:16:53 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>, Arnd Bergmann <arnd@...db.de>,
        Jens Remus <jremus@...ux.ibm.com>,
        Stefan Schulze Frielinghaus <stefansf@...ux.ibm.com>,
        Juergen Christ <jchrist@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 1/9] kbuild: Require gcc-9 for s390

Upcoming changes to s390 specific inline assemblies require the usage of
strings as immediate input operands. This works only with gcc-9 and newer
compilers. With gcc-8 this leads to a compile error:

void bar(void) { asm volatile("" :: "i" ("foo")); }

Results in:

In function 'bar':
 warning: asm operand 0 probably doesn't match constraints
  asm volatile("" :: "i" ("foo"));
  ^~~
 error: impossible constraint in 'asm'

Bump the minimal gcc version from gcc-8 to gcc-9 for s390 to solve this
problem.

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 scripts/min-tool-version.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
index 99b5575c1ef7..1cacd389f29b 100755
--- a/scripts/min-tool-version.sh
+++ b/scripts/min-tool-version.sh
@@ -19,6 +19,8 @@ binutils)
 gcc)
 	if [ "$ARCH" = parisc64 ]; then
 		echo 12.0.0
+	elif [ "$ARCH" = s390 ]; then
+		echo 9.1.0
 	else
 		echo 8.1.0
 	fi
-- 
2.51.0