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Re: [PATCH] Define and use UINT64_C and INT64_C
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 9 Sep 2024 13:38:15 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 09 Sep 2024 11:38:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.09.2024 13:09, Andrew Cooper wrote:
> On 09/09/2024 11:38 am, Jan Beulich wrote:
>> On 09.09.2024 12:08, Frediano Ziglio wrote:
>>> --- a/xen/arch/x86/setup.c
>>> +++ b/xen/arch/x86/setup.c
>>> @@ -1384,9 +1384,9 @@ void asmlinkage __init noreturn __start_xen(unsigned
>>> long mbi_p)
>>> }
>>>
>>> if ( e > min(HYPERVISOR_VIRT_END - DIRECTMAP_VIRT_START,
>>> - 1UL << (PAGE_SHIFT + 32)) )
>>> + UINT64_C(1) << (PAGE_SHIFT + 32)) )
>>> e = min(HYPERVISOR_VIRT_END - DIRECTMAP_VIRT_START,
>>> - 1UL << (PAGE_SHIFT + 32));
>>> + UINT64_C(1) << (PAGE_SHIFT + 32));
>> I disagree - we're dealing with virtual addresses here, which better
>> wouldn't use fixed-width quantities.
>>
>> While not always virtual addresses, I similarly disagree for most or all
>> I've left in context further up: If the underlying type to deal with is
>> unsigned long, constants should match.
>
> This is the same problem I ran into with fixmap mappings.
>
> GB() and friends used in config.h are ULL constants, and promote the
> underlying variables from UL.
>
> 64bit mostly copes (give or take some printk formatting), but 32bit
> fails to compile.
Yet the code above is never built as 32-bit.
Jan
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