[dpdk-stable] [PATCH] eal/ppc: ignore gcc 10 stringop-overflow warnings

[David Christensen]

> Suppress gcc warning "warning: writing 16 bytes into a region of
> size 0" for users of the POWER rte_memcpy() function.  Existing
> rte_memcpy() code takes different code paths based on the actual
> size of the move so the warning is already addressed. See also
> commit b5b3ea803e47 ("eal/x86: ignore gcc 10 stringop-overflow warnings")
> 
> Signed-off-by: David Christensen <drc at linux.vnet.ibm.com>
> ---
> v2:
> - update copyright year
> - rebase for 21.11-rc0

David M,

Any chance of getting this approved in the 21.11 cycle?  Patch was 
originally submitted on 6/23, is only applicable to PPC architecture, 
and has no functional impact because it only disables warnings. 
Patchwork reports a performance test regression on x86 systems:

http://patches.dpdk.org/project/dpdk/patch/20210902221514.3215704-1-drc@linux.vnet.ibm.com/

But I don't see how that is possible.  Applying the patch on a local x86 
system results in identical x86 binaries with and without the patch 
applied.  It would appear that the test-to-test performance variations 
exceed the failure threshold on the CI setup.

Dave