linux-kernel - [PATCH 01/12] scripts: subarch.include: fix SUBARCH on MacOS hosts

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Message-Id: <20240807-macos-build-support-v1-1-4cd1ded85694@samsung.com>
Date: Wed, 07 Aug 2024 01:09:15 +0200
From: Daniel Gomez via B4 Relay <devnull+da.gomez.samsung.com@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Lucas De Marchi <lucas.demarchi@...el.com>, 
 Thomas Hellström <thomas.hellstrom@...ux.intel.com>, 
 Rodrigo Vivi <rodrigo.vivi@...el.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 William Hubbs <w.d.hubbs@...il.com>, Chris Brannon <chris@...-brannons.com>, 
 Kirk Reiser <kirk@...sers.ca>, 
 Samuel Thibault <samuel.thibault@...-lyon.org>, 
 Paul Moore <paul@...l-moore.com>, 
 Stephen Smalley <stephen.smalley.work@...il.com>, 
 Ondrej Mosnacek <omosnace@...hat.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 James Morse <james.morse@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 Zenghui Yu <yuzenghui@...wei.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jiri Slaby <jirislaby@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, 
 intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 speakup@...ux-speakup.org, selinux@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
 linux-serial@...r.kernel.org, llvm@...ts.linux.dev, 
 Finn Behrens <me@...enk.dev>, 
 "Daniel Gomez (Samsung)" <d+samsung@...ces.com>, gost.dev@...sung.com, 
 Daniel Gomez <da.gomez@...sung.com>, 
 Nick Desaulniers <nick.desaulniers@...il.com>
Subject: [PATCH 01/12] scripts: subarch.include: fix SUBARCH on MacOS hosts

From: Nick Desaulniers <nick.desaulniers@...il.com>

When building the Linux kernel on an aarch64 MacOS based host, if we don't
specify a value for ARCH when invoking make, we default to arm and thus
multi_v7_defconfig rather than the expected arm64 and arm64's defconfig.

This is because subarch.include invokes `uname -m` which on MacOS hosts
evaluates to `arm64` but on Linux hosts evaluates to `aarch64`,

This allows us to build ARCH=arm64 natively on MacOS (as in ARCH need
not be specified on an aarch64-based system).

Utilize a negative lookahead regular expression to avoid matching arm64.

Add a separate expression to support for armv.* as per error reported by
Nicolas Schier [1].

[1] https://lore.kernel.org/all/Y3MRvtwdjIwMHvRo@bergen.fjasle.eu/#t

Signed-off-by: Nick Desaulniers <nick.desaulniers@...il.com>
Signed-off-by: Daniel Gomez <da.gomez@...sung.com>
---
 scripts/subarch.include | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/subarch.include b/scripts/subarch.include
index 4bd327d0ae42..5d84ad8c0dee 100644
--- a/scripts/subarch.include
+++ b/scripts/subarch.include
@@ -6,7 +6,8 @@
 
 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 				  -e s/sun4u/sparc64/ \
-				  -e s/arm.*/arm/ -e s/sa110/arm/ \
+				  -e s/armv.*/arm/ \
+				  -e s/arm\(?:\(?!64\).*\)/arm/ -e s/sa110/arm/ \
 				  -e s/s390x/s390/ \
 				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \

-- 
Git-146)