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Re: [Xen-devel] [PATCH v4 01/12] x86: infrastructure to allow converting certain indirect calls to direct ones


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 2 Oct 2018 14:21:21 +0100
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>
  • Delivery-date: Tue, 02 Oct 2018 13:21:26 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 02/10/18 11:12, Jan Beulich wrote:
> --- a/xen/include/xen/lib.h
> +++ b/xen/include/xen/lib.h
> @@ -66,6 +66,10 @@
>  
>  #define ROUNDUP(x, a) (((x) + (a) - 1) & ~((a) - 1))
>  
> +#define count_va_arg_(dot, a1, a2, a3, a4, a5, a6, a7, a8, x, ...) x
> +#define count_va_arg(args...) \
> +    count_va_arg_(., ## args, 8, 7, 6, 5, 4, 3, 2, 1, 0)

This particular bit of review split out for obvious reasons.

We already have __count_args() in the ARM SMCCC infrastructure.  Please
can we dedup that (broken out into a separate patch) rather than
introducing a competing version.

The ARM version is buggy.  It is off-by-two in the base case, and
doesn't compile if fewer than two parameters are passed.  This version
functions correctly, but should be named with a plural.

~Andrew

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