[v2] RISC-V: Add ptrace support for vectors

[Conor Dooley]

On Thu, Aug 31, 2023 at 10:05:04AM -0700, Nick Desaulniers wrote:
> On Fri, Aug 25, 2023 at 05:02:46AM +0000, Andy Chiu wrote:
> > This patch add back the ptrace support with the following fix:
> >  - Define NT_RISCV_CSR and re-number NT_RISCV_VECTOR to prevent
> >    conflicting with gdb's NT_RISCV_CSR.
> >  - Use struct __riscv_v_regset_state to handle ptrace requests
> > 
> > Since gdb does not directly include the note description header in
> > Linux and has already defined NT_RISCV_CSR as 0x900, we decide to
> > sync with gdb and renumber NT_RISCV_VECTOR to solve and prevent future
> > conflicts.
> > 
> > Fixes: 0c59922c769a ("riscv: Add ptrace vector support")
> > Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
> 
> Hi Andy, this is causing an instance of -Wunused-variable. PTAL.
> 
> Please use the following tags on the fix:
> 
> Reported-by: "kernelci.org bot" <bot at kernelci.org>
> Closes: https://lore.kernel.org/linux-next/64f03ea1.170a0220.d3dbf.11fd@mx.google.com/
> 
> Let's see if I can get the regzbot tag correct; first time trying it.
> 
> #regzbot introduced dbe46b094026

See <20230830203754.24940-1-palmer at rivosinc.com> for the fix.

That has you gave regzbot prob won't be stable though, branch needs a
rebase to add missing SoB tags from its committer.
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