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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>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 27 Mar 2025 14:16:46 +0100
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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>, 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 13:16:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.03.2025 13:50, Oleksii Kurochko wrote:
>
> On 3/27/25 1:44 AM, Andrew Cooper wrote:
>> 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.
>
> Do you mean this
> patch:https://lore.kernel.org/xen-devel/20250320153241.43809-3-andrew.cooper3@xxxxxxxxxx/?
>
> I haven't checked clang but if to look at gcc then these builtin macros was
> introduced in
> 024a85aeb6a("c-cppbuiltin.c (builtin_define_type_sizeof): New function.") and
> it seems like even older then gcc5
> contains this patch:
> $ git tag --contains 024a85aeb6a912811d917f737eaad39140c2fb0c
> ...
> releases/gcc-4.3.0
> ...
>
> Am I missing something?
The check yet to be adjusted is looking for 4.1, so 4.3 would already be "too
new".
Jan
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