[PATCH v4] aarch64: enforce >=64K guard size

[Florian Weimer]

* Szabolcs Nagy:

> 2018-07-12  Szabolcs Nagy  <szabolcs.nagy@arm.com>
>
> 	* nptl/allocatestack.c (allocate_stack): Use ARCH_MIN_GUARD_SIZE.
> 	* sysdeps/aarch64/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/alpha/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/arm/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/hppa/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/i386/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/ia64/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/m68k/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/microblaze/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/mips/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/nios2/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/powerpc/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/riscv/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/s390/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/sh/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/sparc/sparc32/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/sparc/sparc64/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.
> 	* sysdeps/x86_64/nptl/pthreaddef.h (ARCH_MIN_GUARD_SIZE): Define.

Would you be able to repost this against the current tree?

Given the realities on the GCC side (probe interval is 64 KiB even with
4 KiB pages), I think there's little choice left here.

Hopefully I will be able to review the implementation in a timely
manner.  I don't have any conceptual objections anymore.

Thanks,
Florian
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