Re: [PATCH] block: set default max segment size in case of virt_boundary

[Jens Axboe <axboe@kernel.dk>]

On 5/6/24 7:41 PM, Ming Lei wrote:
> On Wed, Apr 24, 2024 at 09:47:22PM +0800, Ming Lei wrote:
>> For devices with virt_boundary limit, the driver may provide zero max
>> segment size, we have to set it as UINT_MAX at default. Otherwise, it
>> may cause warning in driver when handling sglist.
>>
>> Fix it by setting default max segment size as UINT_MAX.
>>
>> Cc: Christoph Hellwig <hch@lst.de>
>> Cc: Mike Snitzer <snitzer@kernel.org>
>> Fixes: b561ea56a264 ("block: allow device to have both virt_boundary_mask and max segment size")
>> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
>> Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
>> Closes: https://lore.kernel.org/linux-block/7e38b67c-9372-a42d-41eb-abdce33d3372@linux-m68k.org/
>> Signed-off-by: Ming Lei <ming.lei@redhat.com>
>> ---
>>  block/blk-settings.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/block/blk-settings.c b/block/blk-settings.c
>> index d2731843f2fc..9d6033e01f2e 100644
>> --- a/block/blk-settings.c
>> +++ b/block/blk-settings.c
>> @@ -188,7 +188,10 @@ static int blk_validate_limits(struct queue_limits *lim)
>>  	 * bvec and lower layer bio splitting is supposed to handle the two
>>  	 * correctly.
>>  	 */
>> -	if (!lim->virt_boundary_mask) {
>> +	if (lim->virt_boundary_mask) {
>> +		if (!lim->max_segment_size)
>> +			lim->max_segment_size = UINT_MAX;
>> +	} else {
>>  		/*
>>  		 * The maximum segment size has an odd historic 64k default that
>>  		 * drivers probably should override.  Just like the I/O size we
> 
> Hello Jens,
> 
> Looks this fix is missed, can you make it to v6.9?

Oops yes, thanks for the reminder.

-- 
Jens Axboe