[PATCH] nptl: support thread stacks that grow up [ping]

[Mike Frysinger]

On 12 Jan 2016 13:03, Roland McGrath wrote:
> It looks OK to me.  If you can verify that it doesn't change the generated
> code nontrivially on x86_64, then I think that is sufficient to declare it
> safe enough for working machines.  And grows-up machines are sufficiently
> broken today in trunk that I'm not concerned about you making them worse.

pthread_create.c & pthread_getattr_np.c have mostly the same disassembly.
my gcc is being weird and changing a constant in one insn depending on
whitespace in the file.

allocatestack.c has some code shuffling, but it's the same size overall.

tests still pass on x86_64.

i'll push after the 2.23 branch.
-mike
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