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Re: [PATCH] S/390: Fix two issues with the IFUNC optimized mem*routines

From: David Miller <davem at davemloft dot net>
To: hjl dot tools at gmail dot com
Cc: krebbel at linux dot vnet dot ibm dot com, aj at suse dot com, libc-alpha at sourceware dot org
Date: Wed, 29 Aug 2012 11:27:15 -0400 (EDT)
Subject: Re: [PATCH] S/390: Fix two issues with the IFUNC optimized mem*routines
References: <503E009B.3080302@linux.vnet.ibm.com><20120829.102824.1665442145497742457.davem@davemloft.net><CAMe9rOqOrsd-okd57J-j8kN2+VhLsEMaA1Z7vctBwFUQ_rHwzA@mail.gmail.com>

From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Wed, 29 Aug 2012 08:13:11 -0700

> a1 definition can come from a different DSO at run-time.

You can't do that, a1 must have visibility private to the final linked
object.

There is no sense in trying to support this other case.

When you write IFUNC resolvers, you a linking together with the
implementations you intend to reference and use.

Any other usage really isn't worth supporting.

Follow-Ups:
- Re: [PATCH] S/390: Fix two issues with the IFUNC optimized mem* routines
  - From: H.J. Lu

References:
- Re: [PATCH] S/390: Fix two issues with the IFUNC optimized mem* routines
  - From: Andreas Krebbel
- Re: [PATCH] S/390: Fix two issues with the IFUNC optimized mem*routines
  - From: David Miller
- Re: [PATCH] S/390: Fix two issues with the IFUNC optimized mem* routines
  - From: H.J. Lu

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