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Re: [PATCH v8 02/17] xen: introduce generic non-atomic test_*bit()
- To: Oleksii <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 26 Apr 2024 12:48:59 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 26 Apr 2024 10:49:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.04.2024 10:14, Oleksii wrote:
> On Thu, 2024-04-25 at 17:35 +0200, Jan Beulich wrote:
>>> /* --------------------- Please tidy above here -----------------
>>> ---- */
>>>
>>> #include <asm/bitops.h>
>>>
>>> +#ifndef arch_check_bitop_size
>>> +#define arch_check_bitop_size(addr)
>>
>> Can this really do nothing? Passing the address of an object smaller
>> than
>> bitop_uint_t will read past the object in the generic__*_bit()
>> functions.
> Agree, in generic case it would be better to add:
> #define arch_check_bitop_size(addr) (sizeof(*(addr)) <
> sizeof(bitop_uint_t))
At which point x86 won't need any special casing anymore, I think.
Jan
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