linux-kernel - Re: [PATCH v2 07/12] s390: add pte_free

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Message-ID: <b454cfb1-85dc-743f-8f0-30d7e3d4376@google.com>
Date:   Thu, 6 Jul 2023 12:45:14 -0700 (PDT)
From:   Hugh Dickins <hughd@...gle.com>
To:     Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
cc:     Hugh Dickins <hughd@...gle.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
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Subject: Re: [PATCH v2 07/12] s390: add pte_free_defer() for pgtables sharing
 page

On Thu, 6 Jul 2023, Gerald Schaefer wrote:
> 
> Since none of my remarks on the comments seem valid or strictly necessary
> any more, and I also could not find functional issues, I think you can add
> this patch as new version for 07/12. And I can now give you this:
> 
> Reviewed-by: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>

Great, thanks a lot Gerald.
The one change I'm making to it is then this merged in:

--- a/arch/s390/mm/pgalloc.c
+++ b/arch/s390/mm/pgalloc.c
@@ -455,6 +455,11 @@ void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable)
 	page = virt_to_page(pgtable);
 	SetPageActive(page);
 	page_table_free(mm, (unsigned long *)pgtable);
+	/*
+	 * page_table_free() does not do the pgste gmap_unlink() which
+	 * page_table_free_rcu() does: warn us if pgste ever reaches here.
+	 */
+	WARN_ON_ONCE(mm_alloc_pgste(mm));
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */