Re: [PATCH] ioapic: fix potential resume deadlock

From: Ingo Molnar
Date: Mon May 16 2011 - 07:34:30 EST

* Suresh Siddha <suresh.b.siddha@xxxxxxxxx> wrote:

> On Wed, 2011-05-11 at 09:15 -0700, Daniel J Blueman wrote:
> > Superb, this works, tested against 2.6.39-rc7 and addresses the "BUG:
> > sleeping function called from invalid context at mm/slub.c:824"
> > warning I was previously seeing. It would be good to get this fix into
> > 2.6.39-final if possible.
> >
> > Tested-by: Daniel J Blueman <daniel.blueman@xxxxxxxxx>
> Thanks Daniel for testing my quick patch. I have appended the complete
> patch which cleans up this code.
> Ingo, This patch is relatively big (mostly removes the duplicate code
> and changes the location where we allocate ioapic_saved_data, so that
> this can be shared between interrupt-remapping and io-apic
> suspend/resume flows). May be this can go into 2.6.40-rc1 and probably
> go to 2.6.39-stable?

Could you please split it up into multiple steps? Commits with such a diffstat:

> arch/x86/include/asm/io_apic.h | 21 ++----
> arch/x86/kernel/apic/apic.c | 49 ++++----------
> arch/x86/kernel/apic/io_apic.c | 148 +++++++++++-----------------------------
> 3 files changed, 61 insertions(+), 157 deletions(-)

... rarely come without regressions attached, and it's a whole lot easier to
figure out what's wrong with a small patch out of 3-4 than with such a big

I'd suggest to make the end result exactly the same as this one big patch, so
that we preserve Daniel's testing results.


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