From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52ECC146D5A for ; Mon, 21 Sep 2026 04:09:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789963780; cv=none; b=oxPQTl0wcL7y6rVo+DqWI/Xi/Ub/KlFrhafoJQBptFqiXWEXZONlX0d777mN6j1mAjGn8kFEd+81lfSYrsQAlAIBXV3k4XqNlbCKYnj1UfiQGkGTVKKNa2tOswVpSP5Of6FB6ijL/m+XT/TcTd5Z7Nk2nTLG4vdP2+kMDpfrK2E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789963780; c=relaxed/simple; bh=uhCVX8T2W0/Pe7dIxiBuGi9xyW5goiPEDuDC5E83Ljw=; h=Date:To:From:Subject:Message-Id; b=n+Qb+PKv8PCrutVi7nHj/+XTFUdPgeSsw2cpkrWM65WlkoTiD9Rl7xchGD3lfZVsayAUhxYiYu2NS2J9yc9pxR9/VoxpGwZ+lwGbDG39sc7LcipzeLncKqdHLCJphD2RNmWZxV2riG/rXES89JEzsjKri1uQjQMcDBBpYyxoYdc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=wW8pZB0t; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="wW8pZB0t" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D87341F000FF; Mon, 21 Sep 2026 04:09:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789963779; bh=0WWt3n3s6wHEfPHHonHiWv3CoFRGMV2bEXHEGuIniPo=; h=Date:To:From:Subject; b=wW8pZB0tXAU1e88XvSsIxzdlgR0SpkIIwS/jOEZbSp41TK24i6bX/3MPVm962zKRd j9pqjRSD+Sae0yKGw5L3ph3AiGwIOEti9/BhA8VMdTpz3nq+8NLj67zpxJXuJqqGO3 QGRmySx3iwCXgqgbtka5bdeMsbHRh0t0XL/UlLzo= Date: Sun, 20 Sep 2026 21:09:38 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,akpm@linux-foundation.org From: Andrew Morton Subject: + xen-grant-table-stop-setting-pg_private-on-pages-for-grant-mapping.patch added to mm-unstable branch Message-Id: <20260921040938.D87341F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: xen/grant-table: stop setting PG_private on pages for grant mapping has been added to the -mm mm-unstable branch. Its filename is xen-grant-table-stop-setting-pg_private-on-pages-for-grant-mapping.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/xen-grant-table-stop-setting-pg_private-on-pages-for-grant-mapping.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Zi Yan Subject: xen/grant-table: stop setting PG_private on pages for grant mapping Date: Sun, 20 Sep 2026 22:27:59 -0400 gnttab_alloc_pages() stores xen_page_foreign in page->private. On 32-bit, a pointer to an allocated xen_page_foreign is stored; on 64-bit, xen_page_forCcgn is stored inline. Checking page->private != NULL is enough to tell whether a xen_page_foreign needs to be freed on 32-bit and page->private is zeroed unconditionally on 64-bit. It prepares for a future commit that remove PG_private. No functional change intended. Assisted-by: LLM Link: https://lore.kernel.org/20260920-remove-pg_private-v5-3-bb68b6a21869@nvidia.com Signed-off-by: Zi Yan Signed-off-by: Andrew Morton Reviewed-by: David Hildenbrand (Arm) Cc: Juergen Gross Cc: Stefano Stabellini Cc: Oleksandr Tyshchenko --- drivers/xen/grant-table.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) --- a/drivers/xen/grant-table.c~xen-grant-table-stop-setting-pg_private-on-pages-for-grant-mapping +++ a/drivers/xen/grant-table.c @@ -863,10 +863,10 @@ EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_ int gnttab_pages_set_private(int nr_pages, struct page **pages) { +#if BITS_PER_LONG < 64 int i; for (i = 0; i < nr_pages; i++) { -#if BITS_PER_LONG < 64 struct xen_page_foreign *foreign; foreign = kzalloc_obj(*foreign); @@ -874,9 +874,9 @@ int gnttab_pages_set_private(int nr_page return -ENOMEM; set_page_private(pages[i], (unsigned long)foreign); -#endif - SetPagePrivate(pages[i]); } +#endif + /* Data is stored in page->private on 64-bit */ return 0; } @@ -1031,12 +1031,11 @@ void gnttab_pages_clear_private(int nr_p int i; for (i = 0; i < nr_pages; i++) { - if (PagePrivate(pages[i])) { #if BITS_PER_LONG < 64 + if (page_private(pages[i])) kfree((void *)page_private(pages[i])); #endif - ClearPagePrivate(pages[i]); - } + set_page_private(pages[i], 0); } } EXPORT_SYMBOL_GPL(gnttab_pages_clear_private); _ Patches currently in -mm which might be from ziy@nvidia.com are mm-zsmalloc-replace-pg_private-with-pointer-comparison.patch perf-ring_buffer-stop-using-pg_private-as-aux-page-high-order-marker.patch xen-grant-table-stop-setting-pg_private-on-pages-for-grant-mapping.patch fscrypt-stop-setting-pg_private-on-bounce-page.patch mm-hugetlb-use-direct-assignment-instead-of-folio_change_private.patch f2fs-stop-using-pg_private.patch f2fs-convert-the-private-flag-helpers-to-folio-only.patch erofs-mm-pagemap-add-readahead_folio_last-to-avoid-folio-private.patch erofs-use-folio_attach-detach_private-instead-of-direct-assignment.patch mm-page-flags-check-page-folio-private-instead-of-pg_private.patch treewide-remove-folio_set-clear_private-usage.patch ceph-replace-pageprivate-with-page_private.patch treewide-remove-pageprivate-and-pg_private-from-comments-and-docs.patch mm-page-flags-remove-pg_private.patch usb-gadgetfs-do-not-warn-about-excessively-large-memory-allocations.patch