Re: [PATCH v1 2/2] mm: remove extra ZONE_DEVICE struct page refcount

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On Thu, Oct 14, 2021 at 10:39:28AM -0500, Alex Sierra wrote:
> From: Ralph Campbell <rcampbell@xxxxxxxxxx>
> 
> ZONE_DEVICE struct pages have an extra reference count that complicates the
> code for put_page() and several places in the kernel that need to check the
> reference count to see that a page is not being used (gup, compaction,
> migration, etc.). Clean up the code so the reference count doesn't need to
> be treated specially for ZONE_DEVICE.
> 
> Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
> Signed-off-by: Alex Sierra <alex.sierra@xxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>

Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>



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