[PATCH] use might_sleep check if kmap_high is called from atomic context

[zhangchun]

>On Tue, Aug 20, 2024 at 09:53:11AM +0800, zhangchun wrote:
>> kmap_high is defined as EXPORT_SYMBOL, and cannot be called from 
>> atomic context. Add might_sleep check is necessary.

>No.  Nobody should be calling kmap_high() directly.  There's already a
>might_sleep() in kmap().  No need to add one in kmap_high().

To avoid anyone calls kmap_high directly, add function description "Don't
use kmap_high directly, if necessary, please use kmap"
Signed-off-by: zhangchun <zhang.chuna@xxxxxxx>
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1.8.3.1