From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Oleksandr Tyshchenko <olekstysh@gmail.com>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
Juergen Gross <jgross@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>
Subject: Re: [PATCH V2 3/4] xen/unpopulated-alloc: Add mechanism to use Xen resource
Date: Thu, 28 Oct 2021 15:08:51 -0400 [thread overview]
Message-ID: <0b1837f9-57ef-8deb-df78-cb7841d93d68@oracle.com> (raw)
In-Reply-To: <1635264312-3796-4-git-send-email-olekstysh@gmail.com>
On 10/26/21 12:05 PM, Oleksandr Tyshchenko wrote:
>
> +static void unpopulated_init(void)
> +{
> + static bool inited = false;
> + int ret;
> +
> + if (inited)
> + return;
> +
> + /*
> + * Try to initialize Xen resource the first and fall back to default
> + * resource if arch doesn't offer one.
> + */
> + ret = arch_xen_unpopulated_init(&xen_resource);
> + if (!ret)
> + target_resource = &xen_resource;
> + else if (ret == -ENOSYS)
> + target_resource = &iomem_resource;
> + else
> + pr_err("Cannot initialize Xen resource\n");
I'd pass target_resource as a parameter to arch_xen_unpopulated_init() instead. Default routine will assign it iomem_resource and you won't have to deal with -ENOSYS.
Also, what happens in case of error? Is it fatal? I don't think your changes in fill_list() will work.
> +
> + inited = true;
I agree with Stefano in that it would be better to call this from an init function, and you won't have t worry about multiple calls here.
-boris
next prev parent reply other threads:[~2021-10-28 19:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 16:05 [PATCH V2 0/4] xen: Add support of extended regions (safe ranges) on Arm Oleksandr Tyshchenko
2021-10-26 16:05 ` [PATCH V2 1/4] xen/unpopulated-alloc: Drop check for virt_addr_valid() in fill_list() Oleksandr Tyshchenko
2021-10-28 18:57 ` Boris Ostrovsky
2021-10-26 16:05 ` [PATCH V2 2/4] arm/xen: Switch to use gnttab_setup_auto_xlat_frames() for DT Oleksandr Tyshchenko
2021-10-28 1:28 ` Stefano Stabellini
2021-11-10 22:14 ` Oleksandr
2021-11-19 0:32 ` Stefano Stabellini
2021-11-19 18:25 ` Oleksandr
2021-10-26 16:05 ` [PATCH V2 3/4] xen/unpopulated-alloc: Add mechanism to use Xen resource Oleksandr Tyshchenko
2021-10-28 16:37 ` Stefano Stabellini
2021-11-09 18:34 ` Oleksandr
2021-11-19 0:59 ` Stefano Stabellini
2021-11-19 18:18 ` Oleksandr
2021-11-20 2:19 ` Stefano Stabellini
2021-11-23 16:46 ` Oleksandr
2021-11-23 21:25 ` Stefano Stabellini
2021-11-24 9:33 ` Oleksandr
2021-11-24 5:16 ` Juergen Gross
2021-11-24 9:37 ` Oleksandr
2021-10-28 19:08 ` Boris Ostrovsky [this message]
2021-11-09 18:51 ` Oleksandr
2021-10-26 16:05 ` [PATCH V2 4/4] arm/xen: Read extended regions from DT and init " Oleksandr Tyshchenko
2021-10-28 1:40 ` Stefano Stabellini
2021-11-10 20:21 ` Oleksandr
2021-11-19 1:19 ` Stefano Stabellini
2021-11-19 20:23 ` Oleksandr
2021-11-20 2:36 ` Stefano Stabellini
2021-11-20 13:38 ` Oleksandr
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