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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>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 27 Mar 2025 17:14:51 +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>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 27 Mar 2025 16:14:58 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.03.2025 17:12, Oleksii Kurochko wrote:
>
> On 3/27/25 2:16 PM, Jan Beulich wrote:
>> 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".
>
> I guess you mean this one check:
> check-$(gcc) = $(call cc-ver-check,CC,0x040100,"Xen requires at least
> gcc-4.1")
>
> Could I ask then why in the link above it is checked different version?
Because we're only in the process of switching to a higher baseline. Some
parts still need bringing back in sync. Which is also why Andrew said what
he said.
Jan
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