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 27A53225413 for ; Sun, 5 Jul 2026 07:31:31 +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=1783236693; cv=none; b=SAnQyC/FC99HJQuTkclTOecufJqdbg5cBGj3k5ppCqsrclWfr8J+hqR17dlQw/QRHX2D/ogketoqSHjYW3kbunkEPlJO/DLBv8wim1RIUgcZHgStI8nqepOK18ISQUjSdvBhPP+XVQCYRdJj2qvBjl1ZDTOPolxCdEXbb06dmQo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783236693; c=relaxed/simple; bh=fiOQtKG/zTWVZ7Wy0AjfmeK4hGClwh+XliMSPZFQf18=; h=Date:To:From:Subject:Message-Id; b=cu8SWZSK/+SDuKbihM180SdgUBfhsjblbREkg5Ng+WB/iW3OTQAK986WRz2yj2xBG1BsJmc/yop6OZOjuBGnOmC27RXHzhrMgOoNSk7JgDac3Rsn6dK610AFVCEPokON9mHjmy+yVexkMw5ShtoPPmhNONFe4ZzBN/5IgyM9Fg8= 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=S1UfCGBP; 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="S1UfCGBP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A591F1F000E9; Sun, 5 Jul 2026 07:31:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1783236691; bh=HTcjrS9hHywC89KtjU/JhK/ebB0lQayB+pljtdUZ5tM=; h=Date:To:From:Subject; b=S1UfCGBPPDIlGxXK+5CGVd08ysN5OWiHDBbzbG+e5PzNO6GSwDIBSbIu22XpgnsTB fadMNy5nnccJXfDtBTY46WdqXRRzfWniKnl0qazWn+LEYj6roOmX8FTrNgTMH3HWcE VGrplaC8aXbSpPHhcwU+4uF6SjI3YKJbQ5FSRC0w= Date: Sun, 05 Jul 2026 00:31:31 -0700 To: mm-commits@vger.kernel.org,jackmanb@google.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-page_alloc-relax-gfp-warn-in-nolock-allocs.patch added to mm-new branch Message-Id: <20260705073131.A591F1F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/page_alloc: relax GFP WARN in nolock allocs has been added to the -mm mm-new branch. Its filename is mm-page_alloc-relax-gfp-warn-in-nolock-allocs.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-relax-gfp-warn-in-nolock-allocs.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: Brendan Jackman Subject: mm/page_alloc: relax GFP WARN in nolock allocs Date: Fri, 03 Jul 2026 12:31:46 +0000 This WARN forbids setting other flags than __GFP_ACCOUNT but we unconditionally set the ones in gfp_nolock so they are certainly fine for the caller to set. There are other GFP flags that are almost certainly fine to set here; Willy noted GFP_HIGHMEM, GFP_DMA, GFP_MOVABLE and GFP_HARDWALL. But, nolock allocation is rather special, so be conservative to try and ensure we have a chance to think carefully before nontrivial new usecases arise. Link: https://lore.kernel.org/20260703-alloc-trylock-v5-6-c87b714e19d3@google.com Signed-off-by: Brendan Jackman Suggested-by: Matthew Wilcox Link: https://lore.kernel.org/linux-mm/ajS96fWbG4dzP3u3@casper.infradead.org/ Reviewed-by: Suren Baghdasaryan Reviewed-by: Vlastimil Babka (SUSE) Acked-by: Harry Yoo (Oracle) Acked-by: Zi Yan Signed-off-by: Andrew Morton --- mm/page_alloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/mm/page_alloc.c~mm-page_alloc-relax-gfp-warn-in-nolock-allocs +++ a/mm/page_alloc.c @@ -5355,7 +5355,8 @@ struct page *__alloc_frozen_pages_noprof return NULL; if (alloc_flags & ALLOC_NOLOCK) { - VM_WARN_ON_ONCE(gfp & ~__GFP_ACCOUNT); + /* Certain other flags could be supported later if needed. */ + VM_WARN_ON_ONCE(gfp & ~(__GFP_ACCOUNT | gfp_nolock)); if (!alloc_nolock_allowed()) return NULL; gfp |= gfp_nolock; _ Patches currently in -mm which might be from jackmanb@google.com are mm-page_alloc-drop-flag-conversion-optimisation.patch mm-secretmem-disable-under-highmem.patch mm-page_alloc-rename-alloc_trylock-alloc_nolock.patch mm-page_alloc-some-renames-to-clarify-alloc_flags-scopes.patch mm-name-some-args-in-a-function-declaration.patch mm-split-out-internal-page_alloch.patch mm-page_alloc-unify-__alloc_frozen_pages_noprof.patch mm-page_alloc-relax-gfp-warn-in-nolock-allocs.patch mm-move-some-stuff-to-mm-page_alloch.patch perf-x86-intel-use-higher-level-allocator-api.patch kvm-vmx-use-higher-level-allocator-api.patch x86-virt-use-higher-level-allocator-api.patch sgi-xp-use-higher-level-allocator-api.patch net-funeth-switch-to-higher-level-allocator-api.patch mm-remove-__alloc_pages_node.patch mm-move-__alloc_pages-to-mm-page_alloch.patch mm-replace-__gfp_no_codetag-with-alloc_no_codetag.patch mm-page_alloc-drop-alloc_flags-arg-from-alloc_flags_cma.patch mm-factor-out-can_spin_trylock.patch