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Re: [PATCH v5] xen: simplify bitmap_to_xenctl_bitmap for little endian
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Apr 2025 11:30:22 +0200
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- Cc: Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 02 Apr 2025 09:30:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.04.2025 11:21, Andrew Cooper wrote:
> On 01/04/2025 11:09 am, Jan Beulich wrote:
>> --- a/xen/common/bitmap.c
>> +++ b/xen/common/bitmap.c
>> @@ -359,12 +343,11 @@ static void bitmap_byte_to_long(unsigned
>>
>> #elif defined(__LITTLE_ENDIAN)
>>
>> -static void bitmap_long_to_byte(uint8_t *bp, const unsigned long *lp,
>> - unsigned int nbits)
>> -{
>> - memcpy(bp, lp, DIV_ROUND_UP(nbits, BITS_PER_BYTE));
>> - clamp_last_byte(bp, nbits);
>> -}
>> +#define LITTLE_ENDIAN 1 /* For IS_ENABLED(). */
>
> I guess I can fix this in my bswap series by giving __LITTLE_ENDIAN the
> value of 1 when it is defined ?
Hmm, that's an option, yes. Yet then I didn't pay close enough attention
to that part of the respective patch in that series, as I was blindly
assuming it to instead be
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define __LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define __BIG_ENDIAN __ORDER_BIG_ENDIAN__
#endif
to keep the values of the symbols unaltered.
> Otherwise, Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Thanks.
Jan
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