Re: [PATCH 4/5] fs/proc/page: use a folio in stable_page_flags()

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On 2023/11/3 20:28, Matthew Wilcox wrote:
On Fri, Nov 03, 2023 at 03:29:05PM +0800, Kefeng Wang wrote:
Replace ten compound_head() calls with one page_folio().

This is going to conflict with Gregory Price's work:

https://lore.kernel.org/linux-mm/ZUCD1dsbrFjdZgVv@xxxxxxxxxxxx/

Perhaps the two of you can collaborate on a patch series?

Will check this patch.


  	u |= kpf_copy_bit(k, KPF_SLAB,		PG_slab);
-	if (PageTail(page) && PageSlab(page))
+	if (PageTail(page) && folio_test_slab(folio))
  		u |= 1 << KPF_SLAB;

This doesn't make sense ...


Yes, after commit dcb351cd095a ("page-flags: define behavior SL*B-
related flags on compound pages"), the slab could not be a tail,
I will drop this line.





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