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From:   Nathan Chancellor <nathan@kernel.org>
To:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc:     linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        Nick Desaulniers <ndesaulniers@google.com>,
        Kees Cook <keescook@chromium.org>,
        Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH] MIPS: Malta: Enable BLK_DEV_INITRD
Date:   Tue,  8 Feb 2022 12:17:26 -0700
Message-Id: <20220208191726.1304731-1-nathan@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

This configuration is useful for boot testing malta_defconfig in QEMU
with just a simple cpio initrd, instead of a full ext4 rootfs.

This results in an increase of ~164KB of vmlinux (with GCC 11.2.0):

$ diskus vmlinux.before
11.19 MB (11,194,368 bytes)

$ diskus vmlinux.after
11.36 MB (11,358,208 bytes)

This size increase comes from the fact that usr/Kconfig is sourced when
CONFIG_BLK_DEV_INITRD is enabled, which defaults to supporting several
decompression algorithms for compressed initrds. This seems like a
reasonable tradeoff but these configurations could be disabled in the
future if there are complaints about the size increase.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 arch/mips/configs/malta_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/configs/malta_defconfig b/arch/mips/configs/malta_defconfig
index 3321bb576944..3456ac8ded6c 100644
--- a/arch/mips/configs/malta_defconfig
+++ b/arch/mips/configs/malta_defconfig
@@ -4,6 +4,7 @@ CONFIG_HIGH_RES_TIMERS=y
 CONFIG_LOG_BUF_SHIFT=15
 CONFIG_NAMESPACES=y
 CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
 CONFIG_EXPERT=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_SLAB=y

base-commit: dfd42facf1e4ada021b939b4e19c935dcdd55566
-- 
2.35.1