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Date: Sun, 16 Nov 2014 13:56:22 -0500
From: Rich Felker <dalias@...c.org>
To: Andy Lutomirski <luto@...capital.net>
Cc: Russell King - ARM Linux <linux@....linux.org.uk>,
musl@...ts.openwall.com, Szabolcs Nagy <nsz@...t70.net>,
Kees Cook <keescook@...omium.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: ARM atomics overhaul for musl
On Sun, Nov 16, 2014 at 10:27:04AM -0800, Andy Lutomirski wrote:
> Would it make sense for arm and arm64 to add bits for these features
> to AT_HWCAP, along with an extra bit indicating that the kernel
> provides these bits?
Sadly since it wasn't available there from the beginning, I don't
think there would be a lot of benefit in adding it now, but it
wouldn't hurt.
It might be useful if there's a risk that the existing methods will
break in the future; adding it now would ensure that there are only a
known finite set of kernels for which the old hackish string methods
need to be used, so that there's no concern about their compatibility
with future kernels/models.
Rich
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