[PATCH] ARM: Avoid discarding sections that might have SMP_ON_UP fixups
dave.martin at linaro.org
Thu Feb 10 09:11:34 EST 2011
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
> 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):
I haven't identified the precise combination of options which causes
the problem, and I don't really understand what the clean solution
would be -- it's on my list of stuff to look at, but not at the top.
Other people not enabling THUMB2_KERNEL have also had the problem
(though I guess that shouldn't make a difference anyway).
I suggested a patch on the binutils mailing list to add a way for
putting fixups in separate, sensibly-named sections which would allow
for a proper fix to this class of problem, but I haven't had any
significant feedback on that ... anyway, that would not be available
on most people's toolchains for a while even if it got accepted --
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