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Re: [Xen-devel] [PATCH for-4.13 3/6] xen/arm: cpuerrata: Match register size with value size in check_workaround_*


  • To: Julien Grall <julien.grall@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 2 Oct 2019 19:42:44 +0100
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  • Cc: Artem_Mygaiev@xxxxxxxx, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
  • Delivery-date: Wed, 02 Oct 2019 18:42:55 +0000
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On 02/10/2019 19:00, Julien Grall wrote:
> Clang is pickier than GCC for the register size in asm statement. It
> expects the register size to match the value size.
>
> The asm statement expects a 32-bit (resp. 64-bit) value on Arm32
> (resp. Arm64) whereas the value is a boolean (Clang consider to be
> 32-bit).
>
> It would be possible to impose 32-bit register for both architecture
> but this require the code to use __OP32. However, it does not really
> improve the assembly generated. Instead, replace switch the variable
> to use register_t.
>
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
>
> ---
>     Changes in v2:
>         - Use !! per Stefano's request

You are aware that unlikley(), deliberately, has an embedded !! ?

include/xen/compiler.h:11:#define unlikely(x)   __builtin_expect(!!(x),0)

~Andrew

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