From: Oleksandr <olekstysh@gmail.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: "sstabellini@kernel.org" <sstabellini@kernel.org>,
Wei Liu <wl@xen.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
"julien.grall@arm.com" <julien.grall@arm.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: Re: [Xen-devel] [PATCH V2 3/6] [RFC] xen/common: Introduce _xrealloc function
Date: Tue, 6 Aug 2019 21:50:12 +0300 [thread overview]
Message-ID: <760df686-ef36-e400-4ef3-c51334694b68@gmail.com> (raw)
In-Reply-To: <921ff67c-5a61-9f43-965e-e1b2075c2280@suse.com>
On 05.08.19 13:02, Jan Beulich wrote:
Hi, Jan
> While I can see why having a re-allocation function may be handy,
> explicit / direct use of _xmalloc() and _xzalloc() are discouraged,
> in favor of the more type-safe underscore-less variants.
took into account
> I can't
> see though how a type-safe "realloc" could look like, except for
> arrays. If resizing arrays is all you're after, I'd like to
> recommend to go that route rather then the suggested one here. If
> resizing arbitrary objects is the goal, then what you suggest may
> be the only route, but I'd still be not overly happy to see such
> added.
My main goal is to get "ported" from Linux "iommu_fwspec" support
(xrealloc user) in [1].
I tried to retain code as much as possible while porting. So, this patch
adds almost the same thing what the ported code expects.
But, I would be OK to consider modifying a code in a way to resize an
array as well as any other variants if present.
>
> Furthermore you don't even use internals of the allocator: It is
> common practice to avoid re-allocation if the requested size fits
> within the already allocated block. That's not the least helpful
> because in such a case you can't possibly suffer any -ENOMEM
> condition.
agree, took into account as well.
>
> And finally - please note _xmalloc()'s and _xfree()'s use /
> special casing of ZERO_BLOCK_PTR: You absolutely would need to
> mirror this here.
got it, will use for zero-size allocation
[1]
https://lists.xenproject.org/archives/html/xen-devel/2019-08/msg00257.html
Thank you.
--
Regards,
Oleksandr Tyshchenko
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next prev parent reply other threads:[~2019-08-06 18:50 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 16:39 [Xen-devel] [PATCH V2 0/6] iommu/arm: Add Renesas IPMMU-VMSA support + Linux's iommu_fwspec Oleksandr Tyshchenko
2019-08-02 16:39 ` [Xen-devel] [PATCH V2 1/6] iommu/arm: Add iommu_helpers.c file to keep common for IOMMUs stuff Oleksandr Tyshchenko
2019-08-09 17:35 ` Julien Grall
2019-08-09 18:10 ` Oleksandr
2019-08-02 16:39 ` [Xen-devel] [PATCH V2 2/6] iommu/arm: Add ability to handle deferred probing request Oleksandr Tyshchenko
2019-08-12 11:11 ` Julien Grall
2019-08-12 12:01 ` Oleksandr
2019-08-12 19:46 ` Julien Grall
2019-08-13 12:35 ` Oleksandr
2019-08-14 17:34 ` Julien Grall
2019-08-14 19:25 ` Stefano Stabellini
2019-08-15 9:29 ` Julien Grall
2019-08-15 12:54 ` Julien Grall
2019-08-15 13:14 ` Oleksandr
2019-08-15 16:39 ` Oleksandr
2019-08-02 16:39 ` [Xen-devel] [PATCH V2 3/6] [RFC] xen/common: Introduce _xrealloc function Oleksandr Tyshchenko
2019-08-05 10:02 ` Jan Beulich
2019-08-06 18:50 ` Oleksandr [this message]
2019-08-07 6:22 ` Jan Beulich
2019-08-07 17:31 ` Oleksandr
2019-08-06 19:51 ` Volodymyr Babchuk
2019-08-07 6:26 ` Jan Beulich
2019-08-07 18:36 ` Oleksandr
2019-08-08 6:08 ` Jan Beulich
2019-08-08 7:05 ` Jan Beulich
2019-08-08 11:05 ` Oleksandr
2019-08-02 16:39 ` [Xen-devel] [PATCH V2 4/6] iommu/arm: Add lightweight iommu_fwspec support Oleksandr Tyshchenko
2019-08-13 12:39 ` Julien Grall
2019-08-13 15:17 ` Oleksandr
2019-08-13 15:28 ` Julien Grall
2019-08-13 16:18 ` Oleksandr
2019-08-13 13:40 ` Julien Grall
2019-08-13 16:28 ` Oleksandr
2019-08-02 16:39 ` [Xen-devel] [PATCH V2 5/6] iommu/arm: Introduce iommu_add_dt_device API Oleksandr Tyshchenko
2019-08-13 13:49 ` Julien Grall
2019-08-13 16:05 ` Oleksandr
2019-08-13 17:13 ` Julien Grall
2019-08-02 16:39 ` [Xen-devel] [PATCH V2 6/6] iommu/arm: Add Renesas IPMMU-VMSA support Oleksandr Tyshchenko
2019-08-07 2:41 ` Yoshihiro Shimoda
2019-08-07 16:01 ` Oleksandr
2019-08-07 19:15 ` Julien Grall
2019-08-07 20:28 ` Oleksandr Tyshchenko
2019-08-08 9:05 ` Julien Grall
2019-08-08 10:14 ` Oleksandr
2019-08-08 12:44 ` Julien Grall
2019-08-08 15:04 ` Oleksandr
2019-08-08 17:16 ` Julien Grall
2019-08-08 19:29 ` Oleksandr
2019-08-08 20:32 ` Julien Grall
2019-08-08 23:32 ` Oleksandr Tyshchenko
2019-08-09 9:56 ` Julien Grall
2019-08-09 18:38 ` Oleksandr
2019-08-08 12:28 ` Oleksandr
2019-08-08 14:23 ` Lars Kurth
2019-08-08 4:05 ` Yoshihiro Shimoda
2019-08-14 17:38 ` Julien Grall
2019-08-14 18:45 ` Oleksandr
2019-08-05 7:58 ` [Xen-devel] [PATCH V2 0/6] iommu/arm: Add Renesas IPMMU-VMSA support + Linux's iommu_fwspec Oleksandr
2019-08-05 8:29 ` Julien Grall
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