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Re: [PATCH v1] xen/config.h: Move BITS_PER_* definitions from asm/config.h to xen/config.h
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 27 Mar 2025 00:44:26 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>
- Delivery-date: Thu, 27 Mar 2025 00:44:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26/03/2025 5:47 pm, Oleksii Kurochko wrote:
> diff --git a/xen/include/xen/config.h b/xen/include/xen/config.h
> index d888b2314d..dbbf2fce62 100644
> --- a/xen/include/xen/config.h
> +++ b/xen/include/xen/config.h
> @@ -98,4 +98,13 @@
> #define ZERO_BLOCK_PTR ((void *)-1L)
> #endif
>
> +#define BYTES_PER_LONG __SIZEOF_LONG__
> +
> +#define BITS_PER_BYTE __CHAR_BIT__
> +#define BITS_PER_INT (__SIZEOF_INT__ << 3)
> +#define BITS_PER_LONG (BYTES_PER_LONG << 3)
> +#define BITS_PER_LLONG (__SIZEOF_LONG_LONG__ << 3)
> +
> +#define POINTER_ALIGN __SIZEOF_POINTER__
See how much nicer this is. This patch possibly wants to wait until
I've fixed the compiler checks to update to the new baseline, or we can
just say that staging is staging and corner case error messages are fine.
One thing, you have to replace the "<< 3" as you're hard-coding 8 here
and ignoring __CHAR_BIT__.
I'd suggest keeping the BITS_PER_BYTE on the LHS, e.g:
#define BITS_PER_INT (BITS_PER_BYTE * __SIZEOF_INT__)
which tabulates better.
I suggest keeping BITS_PER_XEN_ULONG to be arch-local. ARM is the
odd-one-out having a non-64bit arch use a 64bit XEN_ULONG.
~Andrew
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