Re: [PATCH] rdma/siw: Use proper enumerated type in map_cqe_status

[Jason Gunthorpe]

On Thu, Jul 11, 2019 at 10:30:30AM -0700, Nathan Chancellor wrote:
> On Thu, Jul 11, 2019 at 02:18:08PM -0300, Jason Gunthorpe wrote:
> > On Thu, Jul 11, 2019 at 10:16:44AM -0700, Nick Desaulniers wrote:
> > > On Thu, Jul 11, 2019 at 6:39 AM Jason Gunthorpe <jgg@xxxxxxxx> wrote:
> > > >
> > > > On Thu, Jul 11, 2019 at 01:14:34AM -0700, Nathan Chancellor wrote:
> > > > > Maybe time to start plumbing Clang into your test flow until it can get
> > > > > intergrated with more CI setups? :) It can catch some pretty dodgy
> > > > > behavior that GCC doesn't:
> > > >
> > > > I keep asking how to use clang to build the kernel and last I was told
> > > > it still wasn't ready..
> > > >
> > > > Is it ready now? Is there some flow that will compile with clang
> > > > warning free, on any arch? (at least the portion of the kernel I check)
> > > 
> > > $ make CC=clang ...
> > > 
> > > Let us know if you find something we haven't already.
> > > https://clangbuiltlinux.github.io/
> > > https://github.com/ClangBuiltLinux/linux/issues
> > 
> > What clang version?
> > 
> > Jason
> 
> You'll need clang-9 for x86 because of the asm-goto requirement (or a
> selective set of reverts for clang-8) but everything else should be
> good with clang-8:

The latest clang-9 packages from apt.llvm.org do seem to build the
kernel, I get one puzzling warning under RDMA:

drivers/infiniband/hw/hfi1/platform.o: warning: objtool: tune_serdes()+0x1f4: can't find jump dest instruction at .text+0x118a

And a BPF one:

kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0xd: sibling call from callable instruction with modified stack frame

Jason