From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/8] Initial implementation of kdump for ARM
Date: Mon, 5 Jul 2010 11:18:52 +0100 [thread overview]
Message-ID: <20100705101852.GA19338@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <4C31AD62.6070805@stericsson.com>
On Mon, Jul 05, 2010 at 12:01:06PM +0200, Per Fransson wrote:
> In machine_kexec an identity mapping is set up for the user space part
> of the virtual address space, through a call to setup_mm_for_reboot(). I
> believe this mapping is only necessary because the MMU is kept on and if
> the kexec is done to facilitate the collection of a dump it would be
> nice if a large part of the page table for the crashing context has not
> been corrupted. Don't you agree?
No. The identity mapping is there so that we can safely disable the MMU
and jump to the intended address.
There is an implementation defined delay between writing the control
register and the point in the instruction stream that the effect of that
write is seen.
The missing MMU disable for AMRv6 and ARMv7 is an oversight which needs
to be resolved.
next prev parent reply other threads:[~2010-07-05 10:18 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-05 6:54 [PATCH v2 0/8] Initial implementation of kdump for ARM Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 1/8] arm: kdump: reserve memory for crashkernel Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 2/8] arm: kdump: implement crash_setup_regs() Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 3/8] arm: kdump: implement machine_crash_shutdown() Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 4/8] arm: kdump: skip indirection page when crashing Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 5/8] arm: kdump: implement copy_oldmem_page() Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 6/8] arm: allow passing an ELF64 header to elf_check_arch() Mika Westerberg
2010-05-10 11:20 ` Russell King - ARM Linux
2010-05-10 12:09 ` Mika Westerberg
2010-05-10 12:21 ` Russell King - ARM Linux
2010-05-11 7:17 ` Mika Westerberg
2010-07-16 8:14 ` Mika Westerberg
2010-08-25 2:40 ` Lei Wen
2010-08-25 12:29 ` Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 7/8] arm: kdump: add support for elfcorehdr= parameter Mika Westerberg
2010-05-05 6:54 ` [PATCH v2 8/8] arm: kdump: add CONFIG_CRASH_DUMP Kconfig option Mika Westerberg
2010-05-25 8:19 ` [PATCH v2 0/8] Initial implementation of kdump for ARM Mika Westerberg
2010-06-11 6:36 ` Mika Westerberg
2010-07-02 12:48 ` Per Fransson
2010-07-05 8:28 ` Mika Westerberg
2010-07-05 10:01 ` Per Fransson
2010-07-05 10:18 ` Russell King - ARM Linux [this message]
2010-07-05 10:34 ` Per Fransson
2010-07-05 11:31 ` Mika Westerberg
2010-07-05 12:04 ` Per Fransson
2010-07-05 13:55 ` Russell King - ARM Linux
2010-07-05 14:05 ` Per Fransson
2010-07-05 14:19 ` Russell King - ARM Linux
2010-07-05 15:37 ` Per Fransson
2010-07-05 16:08 ` Nicolas Pitre
2010-07-05 18:14 ` Russell King - ARM Linux
2010-07-06 8:30 ` Per Fransson
2010-07-07 7:29 ` Mika Westerberg
2010-07-08 8:52 ` Per Fransson
2010-07-12 8:20 ` Mika Westerberg
2010-07-09 3:38 ` Simon Horman
2010-07-09 8:19 ` Per Fransson
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