From: matt@codeblueprint•co.uk (Matt Fleming)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2] arm64/efi: prefer AllocatePages() over efi_low_alloc() for vmlinux
Date: Tue, 28 Jul 2015 23:06:40 +0100 [thread overview]
Message-ID: <20150728220640.GF2773@codeblueprint.co.uk> (raw)
In-Reply-To: <CAKv+Gu_EtOV8wannMLG87ai_x3ARu4rUSo9D6w2DQ+Kb5Kjn-A@mail.gmail.com>
On Tue, 28 Jul, at 11:24:23PM, Ard Biesheuvel wrote:
>
> This workaround fixes another issue as well: the arm64 kernel needs to
> be loaded 512 KB above a 2MB aligned boundary, and using
> efi_low_alloc() as we do loses (2 MB - 512 KB) at the bottom if part
> of that 512 KB is occupied, since efi_low_alloc() is not aware of the
> fact that the first 512 KB will remain unused.
>
> What would be most helpful is if efi_low_alloc() could take an offset
> param in addition to the alignment, i.e., alignment == 2MB and offset
> == 512 KB. The offset would default to 0, reverting to the original
> behavior.
>
> If you'd be ok with such a change, I can propose it instead, and wire
> it up into this function.
It's probably because it's late but I'm having trouble thinking this
change through fully.
If it's not too much work, sure, please go ahead and propose a patch,
even the untested, uncompiled "this is what I'm thinking" type.
--
Matt Fleming, Intel Open Source Technology Center
next prev parent reply other threads:[~2015-07-28 22:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 11:38 [PATCH v2] arm64/efi: prefer AllocatePages() over efi_low_alloc() for vmlinux Ard Biesheuvel
2015-07-24 13:04 ` Mark Rutland
2015-07-28 21:17 ` Matt Fleming
2015-07-28 21:24 ` Ard Biesheuvel
2015-07-28 22:06 ` Matt Fleming [this message]
2015-07-29 10:27 ` Will Deacon
2015-10-27 21:15 ` Timur Tabi
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