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 087A033D4EC for ; Mon, 14 Sep 2026 03:51:56 +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=1789357918; cv=none; b=fHXaSXuV9QAsCsO7A/5rfJC77uY7lzb5D/uF1nTaZC3z06U2e+IwH/DWuE/mjldtXvc1vk50gd2m8i+tpOo6DIcx/VILUzSm1uKAcfxFEimJklSm1D9pjkNwLCWtrEXId4mqGqQx6BtOHzJoc5xY6VozoLtErK0b5jI/M53MGhU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789357918; c=relaxed/simple; bh=ofowS4k5bC2wBCenniEG+2mlL0LowSrOftKXKYOiIGM=; h=Date:To:From:Subject:Message-Id; b=WzDbtRKmCtSTBegxzBykKePohDR36A5nGXX/tm3AO9EdDJcw6CEytSsncwqA/+OKtc1mEhZzKgsQYU85a1tR+nnxOxthRpMJfjk9aIscEsCIXwTgrB0omcA7Jt7Rl9rxQbsMlG5E3Pz9FW91wnbAKckxOmDzaoO8zKbw5mu1j7A= 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=ZPteB9qp; 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="ZPteB9qp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8CE711F000FF; Mon, 14 Sep 2026 03:51:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789357916; bh=WV2fNvqurH0bXzzrMQ6xrxNb/6kOWdg7oNIYsZYisxk=; h=Date:To:From:Subject; b=ZPteB9qp0WM3ysi9UsyhOHtk6L2RpGUXbwZ9ZYPB7n0VIL7SStHI9QNvWIVf1PGSZ zpOc/ii7ey4rx8cR3+CtO+iITf5noBaOo09lT/jNcc+y7dR+TPaW+FxyRdnnWCRmu7 FllNXC8sR2h/UrPp/gejcvvw/odb6Ud7pwd2weVY= Date: Sun, 13 Sep 2026 20:51:56 -0700 To: mm-commits@vger.kernel.org,sstabellini@kernel.org,oleksandr_tyshchenko@epam.com,jgross@suse.com,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-new branch Message-Id: <20260914035156.8CE711F000FF@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-new 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-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next 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, 13 Sep 2026 22:24:01 -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_foreign 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/20260913-remove-pg_private-v4-3-848550f7574e@nvidia.com Signed-off-by: Zi Yan Signed-off-by: Andrew Morton 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 md-md-bitmap-replace-pageprivate-with-page_private.patch buffer-replace-page_buffer-with-page_private-and-delete-it.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