linux-kernel - Re: [PATCH v2] powerpc/xive: Add some error handling code to 'xive_spapr

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Date:   Tue, 1 Feb 2022 14:28:29 +0100
From:   Cédric Le Goater <clg@...d.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        <christophe.leroy@...roup.eu>, <benh@...nel.crashing.org>,
        <paulus@...ba.org>, <mpe@...erman.id.au>, <allison@...utok.net>,
        <tglx@...utronix.de>, <groug@...d.org>
CC:     <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2] powerpc/xive: Add some error handling code to
 'xive_spapr_init()'

On 2/1/22 13:31, Christophe JAILLET wrote:
> 'xive_irq_bitmap_add()' can return -ENOMEM.
> In this case, we should free the memory already allocated and return
> 'false' to the caller.
> 
> Also add an error path which undoes the 'tima = ioremap(...)'
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Reviewed-by: Cédric Le Goater <clg@...d.org>

> ---
> NOT compile tested (I don't have a cross compiler and won't install one).
> So if some correction or improvement are needed, feel free to propose and
> commit it directly.


A cross compiler takes a couple of seconds to install on any distro.
It takes a little more to compile the pseries defconfig. To test with
QEMU, grab the disk image here :

   https://github.com/legoater/qemu-ppc-boot/blob/main/buildroot/qemu_ppc64le_pseries-2021.11-7-g3058e75456-20211206

run :

   qemu-system-ppc64 -M pseries -cpu POWER9 -kernel vmlinux -append "console=hvc0 rootwait root=/dev/sda" -drive file=rootfs.ext2,if=scsi,index=0,format=raw -nographic -net nic -net user -serial mon:stdio

and you will have a pseries machine with network and disk using the
XIVE interrupt controller.

To get more info on the genirq layer and the XIVE driver, simply
append :

   dyndbg="file arch/powerpc/sysdev/xive/* +p; file kernel/irq/* +p"

Thanks,

C.