[Bug 56916] [965gm regression] Black screen when under high load on kernel 3.7 (was OK on 3.6)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56916

--- Comment #33 from Cedric Godin <cedric at belbone.be> ---
i will try it asap.
I redid several bisects that pointed to

bf7ad8eeab995710c766df49c9c69a8592ca0216 is the first bad commit
commit bf7ad8eeab995710c766df49c9c69a8592ca0216
Author: Michel Lespinasse <walken at google.com>
Date:   Mon Oct 8 16:30:37 2012 -0700

rbtree: move some implementation details from rbtree.h to rbtree.c

rbtree users must use the documented APIs to manipulate the tree
structure.  Low-level helpers to manipulate node colors and parenthood are
not part of that API, so move them to lib/rbtree.c

it seems to not be the culprit but to expose more the bug.
The only problem I can see (not a de velopper) is that it changes

-static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
-{
-       rb->rb_parent_color = (rb->rb_parent_color & 3) | (unsigned long)p;
-}

to :

+#define rb_color(r)   ((r)->__rb_parent_color & 1)

...

+static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
+{
+       rb->__rb_parent_color = rb_color(rb) | (unsigned long)p;
+}

so changing the "& 3" to "& 1".

I tried to apply that change to a working kernel but had no crash and reverting
it from 3.7 didn't make a stable kernel either.

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