[stable request 3.6~3.10] two ARM spinlock fixes

[Li Zefan]

Hi Greg,

Please queue the following two fixes for 3.10.

15e7e5c1ebf556cd620c9b091e121091ac760f6d
("ARM: 7749/1: spinlock: retry trylock operation if strex fails on free lock")

00efaa0250939dc148e2d3104fb3c18395d24a2d 
("ARM: 7812/1: rwlocks: retry trylock operation if strex fails on free lock")


We found spin_trylock() occasionally fails without lock contention on 3.10.x
when running a simple test.

        for (i = 0; i < 1000000; i++) {
                if (!spin_trylock(&testlock)) {
                        printk("Get lock failed: %d!\n", i);
                        continue;
                }
                spin_unlock(&testlock);
        }

and the bug can be fixed by these two commits.

--
Li Zefan
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