ARM64: Disabling warnings about deprecated armv8 instructions

Ard Biesheuvel [off-list ref] writes:

On 30 January 2017 at 14:13, Russell King - ARM Linux
[off-list ref] wrote:

quoted

On Sun, Jan 22, 2017 at 01:01:53PM +0000, Ard Biesheuvel wrote:

quoted

Emulating unaligned access in the ARM kernel was a mistake: it even
emulates unaligned accesses for instructions like ldm and ldrd, which
require word alignment at the hardware level even in the latest v8
version of the architecture. In contrast, the v8 deprecation warnings
are about enforcing compliance.

Ard, you're totally wrong on the unaligned access thing.  Unaligned
accesses are a fundamental requirement of the kernel's networking
stack.  If you don't have support for unaligned accesses, then you
don't have network support - it's as simple as that.

So, in order for ARMv5 and earlier to have network support, there
was no option to add support for emulating those accesses.

I wasn't aware of that.

Not even David Miller is "aware" of that.  Then again, we're living in a
world of "alternative facts" now.

-- 
M?ns Rullg?rd