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Re: [PATCH][aarch64] Fix hwcap argument passed to ifunc resolvers
- From: Steve Ellcey <sellcey at cavium dot com>
- To: Carlos O'Donell <carlos at redhat dot com>, Szabolcs Nagy <szabolcs dot nagy at arm dot com>, libc-alpha <libc-alpha at sourceware dot org>
- Cc: nd at arm dot com
- Date: Fri, 01 Sep 2017 10:22:24 -0700
- Subject: Re: [PATCH][aarch64] Fix hwcap argument passed to ifunc resolvers
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On Thu, 2017-08-31 at 18:59 -0500, Carlos O'Donell wrote:
> I'd just use the tunables.
OK, I think using tunables is reasonable. I seem to be having some
trouble with it though, maybe you can tell me if I am doing something
wrong.
On a thunderx box I run a program that calls memcpy, which is an ifunc.
It then calls __memcpy_thunderx the way I think it should.
Then, in the debugger, I run:
set environment GLIBC_TUNABLES=glibc.tune.cpu=generic
I rerun my test program and instead of calling __memcpy_generic (which
it should) or __memcpy_thunderx (which it did before), it calls
__memcpy_falkor, which is totally wrong. Am I setting the variable
incorrectly? I don't see any problems with the IS_FALKOR macro so I
think the problem may be in tunable_is_name unless I am just messing
up how GLIBC_TUNABLES is supposed to be set.
Steve Ellcey
sellcey@cavium.com