linux-kernel - Re: [PATCH v4] MIPS: Replace setup_irq() by request

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Message-ID: <20200311053126.GA48442@ubuntu-m2-xlarge-x86>
Date:   Tue, 10 Mar 2020 22:31:26 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     afzal mohammed <afzal.mohd.ma@...il.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        "Maciej W. Rozycki" <macro@...ux-mips.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Keguang Zhang <keguang.zhang@...il.com>,
        Huacai Chen <chenhc@...ote.com>,
        John Crispin <john@...ozen.org>
Subject: Re: [PATCH v4] MIPS: Replace setup_irq() by request_irq()

On Thu, Mar 05, 2020 at 05:27:53PM +0530, afzal mohammed wrote:
> request_irq() is preferred over setup_irq(). Invocations of setup_irq()
> occur after memory allocators are ready.
> 
> Per tglx[1], setup_irq() existed in olden days when allocators were not
> ready by the time early interrupts were initialized.
> 
> Hence replace setup_irq() by request_irq().
> 
> remove_irq() has been replaced by free_irq() as well.
> 
> There were build error's during previous version, couple of which was
> reported by kbuild test robot <lkp@...el.com> of which one was reported
> by Thomas Bogendoerfer <tsbogend@...ha.franken.de> as well. There were a
> few more issues including build errors, those also have been fixed.
> 
> [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
> 
> Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>

This patch regresses booting malta_defconfig with both GCC and clang
with this rootfs and QEMU 4.2.0:

https://github.com/ClangBuiltLinux/continuous-integration/blob/a85e3e44c2570847e22ad8f92f317c2b007c4517/images/mipsel/rootfs.cpio

$ timeout 2m qemu-system-mipsel -machine malta -cpu 24Kf -initrd rootfs.cpio -kernel vmlinux -m 512m -display none -serial mon:stdio

just hangs. I have not done further debugging past the initial bisect.

Cheers,
Nathan