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From: Yinghai Lu <yinghai@kernel.org>
To: Konrad Rzeszutek Wilk <konrad@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@zytor.com>, Jacob Shin <jacob.shin@amd.com>,
	Tejun Heo <tj@kernel.org>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 07/19] x86, mm: Remove early_memremap workaround for page table accessing on 64bit
Date: Mon, 22 Oct 2012 12:08:04 -0700	[thread overview]
Message-ID: <CAE9FiQXpauTV9608M-j7VmPyKNGsubnY15NPb1WRnPrczqq+iA@mail.gmail.com> (raw)
In-Reply-To: <20121022150755.GB22780@phenom.dumpdata.com>

On Mon, Oct 22, 2012 at 8:07 AM, Konrad Rzeszutek Wilk
<konrad@kernel.org> wrote:
> On Thu, Oct 18, 2012 at 01:50:18PM -0700, Yinghai Lu wrote:
>> We do not need that workaround anymore after patches that pre-map page
>> table buf and do not clear initial page table wrongly.
>
>
> .. and somewhere during the v2 posting we had a discussion about
> why this work-around came about. You should include a bit about
> that and copy-n-paste some of that here please.

Not sure which one that you are referring.

anyway I update the changelog to:

---
We try to put page table high to make room for kdump, and at that time
those ranges are not mapped yet, and have to use ioremap to access it.

Now after patch that pre-map page table top down.
        x86, mm: setup page table in top-down
We do not need that workaround anymore.

Just use __va to return directly mapping address.
---

  reply	other threads:[~2012-10-22 19:08 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-18 20:50 [PATCH -v5 00/19] x86: Use BRK to pre mapping page table to make xen happy Yinghai Lu
2012-10-18 20:50 ` [PATCH 1/3] ACPI: Introduce a new acpi handle to determine HID match Yinghai Lu
2012-11-02 12:23   ` Rafael J. Wysocki
2012-11-02 15:03     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 01/19] x86, mm: Align start address to correct big page size Yinghai Lu
2012-10-22 14:16   ` Konrad Rzeszutek Wilk
2012-10-22 16:31     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 2/3] PCI: correctly detect ACPI PCI host bridge objects Yinghai Lu
2012-10-26  9:10   ` Bjorn Helgaas
2012-10-26 18:13     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 02/19] x86, mm: Use big page size for small memory range Yinghai Lu
2012-10-22 14:21   ` Konrad Rzeszutek Wilk
2012-10-22 16:33     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 3/3] PCI, ACPI: debug print for installation of acpi root bridge's notifier Yinghai Lu
2012-10-18 20:50 ` [PATCH 03/19] x86, mm: Don't clear page table if range is ram Yinghai Lu
2012-10-22 14:28   ` Konrad Rzeszutek Wilk
2012-10-22 16:56     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 04/19] x86, mm: only keep initial mapping for ram Yinghai Lu
2012-10-22 14:33   ` Konrad Rzeszutek Wilk
2012-10-22 17:43     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 05/19] x86, mm: Break down init_all_memory_mapping Yinghai Lu
2012-10-18 20:50 ` [PATCH 06/19] x86, mm: setup page table in top-down Yinghai Lu
2012-10-19 16:24   ` Stefano Stabellini
2012-10-19 16:41     ` Yinghai Lu
2012-10-22 13:19       ` Stefano Stabellini
2012-10-22 18:17         ` Yinghai Lu
2012-10-22 18:22           ` Yinghai Lu
2012-10-23 12:16             ` Stefano Stabellini
2012-10-23 18:47               ` Yinghai Lu
2012-10-23 12:22           ` Stefano Stabellini
2012-10-23 18:37             ` Yinghai Lu
2012-10-24 10:55               ` Stefano Stabellini
2012-10-22 14:14       ` Konrad Rzeszutek Wilk
2012-10-22 15:06   ` Konrad Rzeszutek Wilk
2012-10-22 18:56     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 07/19] x86, mm: Remove early_memremap workaround for page table accessing on 64bit Yinghai Lu
2012-10-22 15:07   ` Konrad Rzeszutek Wilk
2012-10-22 19:08     ` Yinghai Lu [this message]
2012-10-18 20:50 ` [PATCH 08/19] x86, mm: Remove parameter in alloc_low_page for 64bit Yinghai Lu
2012-10-22 15:09   ` Konrad Rzeszutek Wilk
2012-10-22 19:09     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 09/19] x86, mm: Merge alloc_low_page between 64bit and 32bit Yinghai Lu
2012-10-22 15:11   ` Konrad Rzeszutek Wilk
2012-10-22 19:14     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 10/19] x86, mm: Move min_pfn_mapped back to mm/init.c Yinghai Lu
2012-10-18 20:50 ` [PATCH 11/19] x86, mm, xen: Remove mapping_pagatable_reserve Yinghai Lu
2012-10-22 15:14   ` Konrad Rzeszutek Wilk
2012-10-22 19:18     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 12/19] x86, mm: Add alloc_low_pages(num) Yinghai Lu
2012-10-22 15:17   ` Konrad Rzeszutek Wilk
2012-10-22 19:24     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 13/19] x86, mm: only call early_ioremap_page_table_range_init() once Yinghai Lu
2012-10-22 15:24   ` Konrad Rzeszutek Wilk
2012-10-22 19:40     ` Yinghai Lu
2012-10-23  0:01       ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 14/19] x86, mm: Move back pgt_buf_* to mm/init.c Yinghai Lu
2012-10-18 20:50 ` [PATCH 15/19] x86, mm: Move init_gbpages() out of setup.c Yinghai Lu
2012-10-18 20:50 ` [PATCH 16/19] x86, mm: change low/hignmem_pfn_init to static on 32bit Yinghai Lu
2012-10-18 20:50 ` [PATCH 17/19] x86, mm: Move function declaration into mm_internal.h Yinghai Lu
2012-10-18 20:50 ` [PATCH 18/19] x86, mm: Let "memmap=" take more entries one time Yinghai Lu
2012-10-22 15:19   ` Konrad Rzeszutek Wilk
2012-10-22 19:26     ` Yinghai Lu
2012-10-18 20:50 ` [PATCH 19/19] x86, mm: Add check before clear pte above max_low_pfn on 32bit Yinghai Lu

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