[PATCH v5 1/4] eal: add nonnull and access function attributes

[Morten Brørup]

> From: Morten Brørup
> Sent: Monday, 9 January 2023 13.28
> 
> > From: David Marchand [mailto:david.marchand at redhat.com]
> > Sent: Monday, 9 January 2023 12.22
> > attributes
> >
> > On Wed, Dec 28, 2022 at 4:10 PM Morten Brørup
> > <mb at smartsharesystems.com> wrote:
> > >
> > > Add "nonnull" function attribute to help the compiler detect a NULL
> > > pointer being passed to a function not accepting NULL pointers as
> an
> > > argument at build time.
> > >
> > > Add "access" function attribute to tell the compiler how a function
> > > accesses its pointer arguments.
> > >
> > > Add these attributes to the rte_memcpy() function, as the first in
> > > hopefully many to come.
> > >
> >
> > Compilation is broken starting first patch, so patches must be
> > reordered to have the fixes first.
> 
> Will do.
> 
> >
> >
> > > v5:
> > > * No changes.
> > > v4:
> > > * No changes.
> > > v3:
> > > * No changes.
> > > v2:
> > > * Only define "nonnull" for GCC and CLANG.
> > > * Append _param/_params to prepare for possible future attributes
> > >   attached directly to the individual parameters, like
> __rte_unused.
> > > * Use RTE_TOOLCHAIN_GCC instead of RTE_CC_GCC, to fix complaints
> > about
> > >   GCC_VERSION being undefined.
> > > * Try to fix Doxygen compliants.
> >
> > Patch history should be put as annotations (i.e. after --- but before
> > patch content).
> 
> Will do.
> 
> [...]
> 
> > This is tightly bound to gcc syntax.
> > With dedicated macros (which I find easier to read too), we can hope
> > to adapt to other compilers if some of them add support for this kind
> > of code cookies.
> > __rte_read_only_params(indexes...)
> > __rte_write_only_params(indexes...)
> > __rte_no_access_params(indexes...)
> 
> I agree. Splitting the generic access macro up into dedicated access
> macros is probably better.

Version 6 of this patch series is here:
https://patchwork.dpdk.org/project/dpdk/list/?series=26560

Please ignore the name of the series.

-Morten