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 923EE7CF18; Mon, 4 Mar 2024 21:31:44 +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=1709587904; cv=none; b=O4STc9nNRb/y8C5XoeG736RwsQ9mMxJDBzGlJhAN0QW7CTYVBhW0GxesnftrQR0dcvLFvV5f8MeqFDPWTGb9frUT+7/4+uOKw6EBR4Itc6unOboK71C6V/+GaE2mDJDGlYRUEB/I+29N0scdjbQ2rH+0f4ir+z/osF+kLnEpdnY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709587904; c=relaxed/simple; bh=eain4lAB6ngw/EYFGJE8S/GekDPPy6sCq/XOawazIU0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XM84V5VcmssNxALNIRFNfTweN3Z8vL4qQEVNxZdih7M/DNhaOxMFwrqmOsUuHyu6Ug+XW24dYgdIMFQ6PzdJw+u1scwZoLEjtJ+kQnkMFSAyRhOXVvtYFZ1nkSPz2tFyJXZxCzEP6mxN/x6fmaEnj8qe5WFs3LmIwISrchpXyWw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=H1PMhKMo; 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="H1PMhKMo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25C36C433C7; Mon, 4 Mar 2024 21:31:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1709587904; bh=eain4lAB6ngw/EYFGJE8S/GekDPPy6sCq/XOawazIU0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H1PMhKMo4w8cCynAyAyYl0ngtgVphRQp605NIqqlgmKchnKjtiA0mRM0fML6U93Dh Gw8WpGdOTIW4Cp3wRPEbTccLp0BUTF22TQKF5VXoa1iiob6qu9IBwykuI0w8fOUB5M J1uJ6oEDS8rXBMEWWFuePCv/eTqi+xcuuVrQ60b8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Aneesh Kumar K.V (IBM)" , Anshuman Khandual , Michael Ellerman , Andrew Morton Subject: [PATCH 6.7 117/162] mm/debug_vm_pgtable: fix BUG_ON with pud advanced test Date: Mon, 4 Mar 2024 21:23:02 +0000 Message-ID: <20240304211555.507877682@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240304211551.833500257@linuxfoundation.org> References: <20240304211551.833500257@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Aneesh Kumar K.V (IBM) commit 720da1e593b85a550593b415bf1d79a053133451 upstream. Architectures like powerpc add debug checks to ensure we find only devmap PUD pte entries. These debug checks are only done with CONFIG_DEBUG_VM. This patch marks the ptes used for PUD advanced test devmap pte entries so that we don't hit on debug checks on architecture like ppc64 as below. WARNING: CPU: 2 PID: 1 at arch/powerpc/mm/book3s64/radix_pgtable.c:1382 radix__pud_hugepage_update+0x38/0x138 .... NIP [c0000000000a7004] radix__pud_hugepage_update+0x38/0x138 LR [c0000000000a77a8] radix__pudp_huge_get_and_clear+0x28/0x60 Call Trace: [c000000004a2f950] [c000000004a2f9a0] 0xc000000004a2f9a0 (unreliable) [c000000004a2f980] [000d34c100000000] 0xd34c100000000 [c000000004a2f9a0] [c00000000206ba98] pud_advanced_tests+0x118/0x334 [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48 [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388 Also kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:202! .... NIP [c000000000096510] pudp_huge_get_and_clear_full+0x98/0x174 LR [c00000000206bb34] pud_advanced_tests+0x1b4/0x334 Call Trace: [c000000004a2f950] [000d34c100000000] 0xd34c100000000 (unreliable) [c000000004a2f9a0] [c00000000206bb34] pud_advanced_tests+0x1b4/0x334 [c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48 [c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388 Link: https://lkml.kernel.org/r/20240129060022.68044-1-aneesh.kumar@kernel.org Fixes: 27af67f35631 ("powerpc/book3s64/mm: enable transparent pud hugepage") Signed-off-by: Aneesh Kumar K.V (IBM) Cc: Anshuman Khandual Cc: Michael Ellerman Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/debug_vm_pgtable.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -362,6 +362,12 @@ static void __init pud_advanced_tests(st vaddr &= HPAGE_PUD_MASK; pud = pfn_pud(args->pud_pfn, args->page_prot); + /* + * Some architectures have debug checks to make sure + * huge pud mapping are only found with devmap entries + * For now test with only devmap entries. + */ + pud = pud_mkdevmap(pud); set_pud_at(args->mm, vaddr, args->pudp, pud); flush_dcache_page(page); pudp_set_wrprotect(args->mm, vaddr, args->pudp); @@ -374,6 +380,7 @@ static void __init pud_advanced_tests(st WARN_ON(!pud_none(pud)); #endif /* __PAGETABLE_PMD_FOLDED */ pud = pfn_pud(args->pud_pfn, args->page_prot); + pud = pud_mkdevmap(pud); pud = pud_wrprotect(pud); pud = pud_mkclean(pud); set_pud_at(args->mm, vaddr, args->pudp, pud); @@ -391,6 +398,7 @@ static void __init pud_advanced_tests(st #endif /* __PAGETABLE_PMD_FOLDED */ pud = pfn_pud(args->pud_pfn, args->page_prot); + pud = pud_mkdevmap(pud); pud = pud_mkyoung(pud); set_pud_at(args->mm, vaddr, args->pudp, pud); flush_dcache_page(page);