RealView: Fix SD/MMC card detection on RealView PB1176

Hi Catalian,

I see this patch

 RealView: Fix SD/MMC card detection on RealView PB1176

The RealView PB1176 has to use GPIO for detecting the SD/MMC card
change.
Commit ID      :                                     e83e8eab985df97f2b49e2863c97bc929a921b63

This is no yet made to Kernel.org nor to stable arm git or is it dropped, or will be supported later.

Regards
Neelu

----------------------------------------
From: Catalin Marinas <catalin.marinas@arm.com>
Sent: Monday, August 24, 2009 8:47 PM
To: Jamie Lokier <redacted>
Subject: Re: LDREX/STREX and pre-emption on SMP hardware 

On Mon, 2009-08-24 at 22:12 +0100, Jamie Lokier wrote:

Catalin Marinas wrote:

quoted

BTW, some time ago I sent a patch to clear the exclusive monitor at
every exception entry (interrupt, aborts etc.) but wasn't accepted. The
main reason for that was to be able to only use STR for atomic_set()
rather than the combination of LDREX/STREX we have now.

Would CLREX+STR work, and would it be an improvement?

IMHO, yes. You use CLREX at every exception entry and make the
atomic_set() function simply use STR. But the argument was that
atomic_set() isn't used very often anyway.

quoted

A similar reason for STR used in application signal handlers which
are usually invoked without a __switch_to call (unless the signal
handler is in a different application from the running one).

How about adding CLREX to the signal handling path?  Not exception
entry, but the part which sets up the signal frame.

Yes, that's the solution, only that I've never had the time to revisit
it and send another patch.

-- 
Catalin

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