From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 F047E238C0C for ; Mon, 23 Jun 2025 11:43:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750678999; cv=none; b=t09t794FfR3WltxtGxCLULzeQnBXSlefD+1/OuIjABdSMfqFgrANzpOZbORytvvGPnlF0ab57w9Ve4Q5UEqYOJCO43n8r1PReiw6Q8OuOGYwF9pKEsY204QhPQHgrFKBmmNEziZDiHfAzeWkFJgOnUfaKqxe5oYNg0j7vUKlGAY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750678999; c=relaxed/simple; bh=wlZuT0wAKoLzfLuz4UtSKvjuvjWamUoBKYCrGagrSOA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=qRQRiQm9HWMZPSptpTjWQsHXWyU9V3vDSyYXWdUbqhAZIz8YWipFz9twSxAUftya3lBRPSMen+p0nO7bTpe+i9CxJyDuc7MZgYcZx04EdHZ19lMwR0RByMBOAE9yLQKmqSKaxlmZTApB0lOPeoD6+fXRcxBMLUoiw4AYCsnmIgg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zWOyk1II; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zWOyk1II" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 770BDC4CEEA; Mon, 23 Jun 2025 11:43:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750678996; bh=wlZuT0wAKoLzfLuz4UtSKvjuvjWamUoBKYCrGagrSOA=; h=Subject:To:Cc:From:Date:From; b=zWOyk1II09tLD2q4RDKbgFXWE7Ukp+0eIxMHbjw9OpT1w8IPyj3WV6GDe/bUCl2v+ KFSesMLU+fxvFDMwIVBj/TbQYPC4CPU9Qfb3FAjCxCkM6CiUiY784L+f//v7CjHpvg hcfdLe3GkpDhWUymB9Y5E9jztSbx920M2ajZXrn0= Subject: FAILED: patch "[PATCH] arm64: Restrict pagetable teardown to avoid false warning" failed to apply to 5.15-stable tree To: dev.jain@arm.com,anshuman.khandual@arm.com,catalin.marinas@arm.com,david@redhat.com,ryan.roberts@arm.com,will@kernel.org Cc: From: Date: Mon, 23 Jun 2025 13:43:04 +0200 Message-ID: <2025062304-prune-getup-2943@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 650768c512faba8070bf4cfbb28c95eb5cd203f3 # git commit -s git send-email --to '' --in-reply-to '2025062304-prune-getup-2943@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 650768c512faba8070bf4cfbb28c95eb5cd203f3 Mon Sep 17 00:00:00 2001 From: Dev Jain Date: Tue, 27 May 2025 13:56:33 +0530 Subject: [PATCH] arm64: Restrict pagetable teardown to avoid false warning Commit 9c006972c3fe ("arm64: mmu: drop pXd_present() checks from pXd_free_pYd_table()") removes the pxd_present() checks because the caller checks pxd_present(). But, in case of vmap_try_huge_pud(), the caller only checks pud_present(); pud_free_pmd_page() recurses on each pmd through pmd_free_pte_page(), wherein the pmd may be none. Thus it is possible to hit a warning in the latter, since pmd_none => !pmd_table(). Thus, add a pmd_present() check in pud_free_pmd_page(). This problem was found by code inspection. Fixes: 9c006972c3fe ("arm64: mmu: drop pXd_present() checks from pXd_free_pYd_table()") Cc: stable@vger.kernel.org Reported-by: Ryan Roberts Acked-by: David Hildenbrand Signed-off-by: Dev Jain Reviewed-by: Catalin Marinas Reviewed-by: Anshuman Khandual Reviewed-by: Ryan Roberts Link: https://lore.kernel.org/r/20250527082633.61073-1-dev.jain@arm.com Signed-off-by: Will Deacon diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 8fcf59ba39db..00ab1d648db6 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1305,7 +1305,8 @@ int pud_free_pmd_page(pud_t *pudp, unsigned long addr) next = addr; end = addr + PUD_SIZE; do { - pmd_free_pte_page(pmdp, next); + if (pmd_present(pmdp_get(pmdp))) + pmd_free_pte_page(pmdp, next); } while (pmdp++, next += PMD_SIZE, next != end); pud_clear(pudp);