[PATCH] ARM: Avoid discarding sections that might have SMP_ON_UP fixups

[Dave Martin]

On Thu, Feb 10, 2011 at 2:11 PM, Dave Martin <dave.martin at linaro.org> wrote:
> On Thu, Feb 10, 2011 at 12:56 PM, Russell King - ARM Linux
> <linux at arm.linux.org.uk> wrote:
>> On Wed, Feb 09, 2011 at 02:22:11PM +0000, Russell King - ARM Linux wrote:
>>> On Wed, Jan 26, 2011 at 05:25:35PM +0000, Dave P. Martin wrote:
>>> > SMP_ON_UP fixups lead to vmlinux link errors if those sections are
>>> > discarded at link-time.  In particular this may happen for built-in
>>> > __exit stuff.
>>> >
>>> > This patch modifies the vmlinux linker script to reduce the amount
>>> > of discarded sections, and tries to make sure that __exit sections
>>> > are kept in.
>>> >
>>> > This is a hack and probably wrong!  Further discussion is needed.
>>>
>>> Can you send the configuration which you see this problem with?
>>> I've tried to build a kernel which inlines the spinlocks, but I find
>>> that's not possible, so I'm doubting whether any fix is required for
>>> mainline.
>>
>> Any news on this, or can it not be reproduced?
>>
>
> Hi, apologies-- didn't see my mail for a bit.
>
> I get the problem with this tree and config (which builds with
> SMP_ON_UP and THUMB2_KERNEL for omap3/4):
>
> Tree: git://git.linaro.org/people/dmart/linux-2.6-arm.git
> dirty/arm/omap-thumb2+merged
> Config: http://people.linaro.org/~dmart/arm_omap-thumb2+v2_config

Note that this tree contains some extra patches (though I believe
nothing is there which should cause the problem), and does not contain
everything from rmk/devel -- so it's possible this has been fixed in
the meantime or no longer occurs for some other reason...

Cheers
---Dave