linux-kernel - Re: [PATCH v6] amba: Remove deferred device addition

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Message-ID: <1196e002-c07d-44fd-b07a-aa5ae446ea0b@roeck-us.net>
Date:   Wed, 10 Aug 2022 05:58:58 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Russell King <linux@...linux.org.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        patches@...linux.org.uk, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] amba: Remove deferred device addition

On 8/9/22 20:33, Saravana Kannan wrote:
[ ... ]

> 
> Can you give me more details on the qemu configuration so I could try
> to reproduce it?

qemu-system-arm -M vexpress-a9 -kernel arch/arm/boot/zImage -no-reboot \
     -initrd rootfs-armv5.cpio -m 128 \
     --append "rdinit=/sbin/init console=ttyAMA0,115200" \
     -dtb arch/arm/boot/dts/vexpress-v2p-ca9.dtb \
     -nographic -monitor null -serial stdio

using multi_v7_defconfig will hang nicely with your patch applied,
and boot as expected without. This was with qemu v7.0, but I am
sure older qemu versions will show the same behavior. The initrd
used should not matter, but you'll find it at
https://github.com/groeck/linux-build-test/blob/master/rootfs/arm-v7/rootfs-armv5.cpio.gz

Guenter