[PATCH v1.1 0/7] aarch64: Allow overriding HWCAP_CPUID feature check

[Siddhesh Poyarekar]

On Friday 12 May 2017 05:40 PM, Szabolcs Nagy wrote:
> it seems LD_HWCAP_MASK affects ldso behaviour,
> (some library search path is computed based on
> "important" hwcap names)
> 
> so it's probably not a good idea to reuse it for
> ifunc dispatch tuning of the libc.
> 
> (the exact semantics of the LD_HWCAP_MASK is not
> clear to me though)

The dynamic linker is trying to allocate space for strings to describe
the hwcaps and somehow setting hwcap_mask like that is causing it to
allocated lots of memory.  It is a bug in the dynamic linker, not a
problem with setting hwcap_mask.

My 'solution' of fixing the test case papered over the fact that the
dynamic linker should not be barfing like this.  I'll work on this.
This is unrelated to the patchset under discussion however since the
problem should be visible even in 2.25.

Siddhesh