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Sat, 12 Sep 2026 12:55:47 -0700 (PDT) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 00721157ae682-88487ea6026sm22569527b3.32.2026.09.12.12.55.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Sep 2026 12:55:46 -0700 (PDT) From: Matt Turner Date: Sat, 12 Sep 2026 15:55:43 -0400 Subject: [PATCH 1/3] xz: add arch-specific tuning for alpha Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260912-alpha-kernel-compression-v1-1-ce9d55330193@gmail.com> References: <20260912-alpha-kernel-compression-v1-0-ce9d55330193@gmail.com> In-Reply-To: <20260912-alpha-kernel-compression-v1-0-ce9d55330193@gmail.com> To: Lasse Collin , Richard Henderson , Magnus Lindholm , Nick Terrell , David Sterba Cc: linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1237; i=mattst88@gmail.com; h=from:subject:message-id; bh=6WBpY++pP4wmpap/0jVFlCXobQj6RCxIU3+Y23QnWmU=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLKWrrP3bfLPW3lE+iqTE+MCvXx+4yTf6EX3GjYt2tX/6 /D5i33/Oz6yMIhxMcwUU2SJW6/IMqttx1Kf09K/YOawMoEMkRZpYAACFga+3MS8UiMdIz1TbUM9 QyBDxygeIqfHoJFZXFyaWqSbVlDkkJdfkliSmZ9XrJdfkJpXkF6gl5aZVpKRkV9UnAo0Qi8vtcT U1dHNyNDAxNLRwszJwtHUxNnZydDJzdHR2dXJyNLcxMDZ0tHE1dKcgYtTAOaae3MY/ils79i75e nlO12C2Zdv35omH5VzkFN8i9JNRuF/dZ5NJzwYGZZ/0hP9xvTiRSXn6VxD05OT22b+if7TsuHwt LzV+10VV/EDAA== X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A Alpha has fixed-length, 4-byte-aligned instructions and no XZ BCJ filter, so it wants the same LZMA2 settings as the other 4-byte-aligned targets. Without an entry it hits the default case, which warns scripts/xz_wrap.sh: Arch-specific tuning is missing for 'alpha' and conservatively assumes 2-byte alignment. Alpha gains HAVE_KERNEL_XZ later in this series; the correct alignment also shrinks a UP1500 kernel's XZ image from 6469320 to 6448840 bytes. Signed-off-by: Matt Turner --- scripts/xz_wrap.sh | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/scripts/xz_wrap.sh b/scripts/xz_wrap.sh index f19369687030..5af0d9045cbc 100755 --- a/scripts/xz_wrap.sh +++ b/scripts/xz_wrap.sh @@ -10,6 +10,7 @@ # XZ-compressed kernel isn't currently supported on every listed arch. # # Arch Align Notes +# alpha 4 # arm 2/4 ARM and ARM-Thumb2 # arm64 4 # csky 2 @@ -44,6 +45,10 @@ BCJ= # Set the BCJ filter if one is available. # It must match the #ifdef usage in lib/decompress_unxz.c. case $SRCARCH in + alpha) + ALIGN=4 + ;; + arm) if is_enabled CONFIG_THUMB2_KERNEL; then ALIGN=2 -- 2.54.0