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[108.93.236.139]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-679b1e4083esm2398412d50.9.2026.10.17.09.53.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Oct 2026 09:53:45 -0700 (PDT) From: Matt Turner Date: Sat, 17 Oct 2026 12:53:33 -0400 Subject: [PATCH v2 1/3] xz: add arch-specific tuning for alpha Precedence: bulk X-Mailing-List: linux-alpha@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: <20261017-alpha-kernel-compression-v2-1-c71e6b08dc63@gmail.com> References: <20261017-alpha-kernel-compression-v2-0-c71e6b08dc63@gmail.com> In-Reply-To: <20261017-alpha-kernel-compression-v2-0-c71e6b08dc63@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=1389; i=mattst88@gmail.com; h=from:subject:message-id; bh=cysc2j1366OmctghB3AI094WnsKsHd73OjTSGM1Q9bU=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLIur+A1vVwjcmtr+d9bh8t/rvnx+LWd+aNXvfsv3Zd8p dN44YuEa8dHFgYxLoaZYooscesVWWa17Vjqc1r6F8wcViaQIdIiDQxAwMLAl5uYV2qkY6Rnqm2o Zwhk6BjFQ+T0GDQyi4tLU4t00wqKHPLySxJLMvPzivXyC1LzCtIL9NIy00oyMvKLilOBRujlpZa Yujq6GRkamFg6Wpg5WTiamjg7Oxk6uTk6Ors6GVmamxg4WzqauFqaM3BxCsBcs+0pI8O8897vvh ls3/5UOu4Bw5mNPZecTmrfdNWvinpnzb5o5Zkghv8pd2oCq21Of/tb6h6zd8unnhWiVy/E3W/nD RMUvmHCP4EbAA== 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 Reviewed-by: Magnus Lindholm Tested-by: Magnus Lindholm Reviewed-by: Lasse Collin --- 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 -- 2.55.0