From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B728847D94D; Tue, 14 Jul 2026 14:06:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784037974; cv=none; b=SL6Iok1f+jzxnLQPuTtMdgyrw1wObwY9RxQCmRxpT73ybUwPN4vgU6tJdfgoKlPM9v1LcDOSfHKB8rbh42mfnhnB0F0AZNHfMQthPc+XyuepJnbp9xuvTv+UGRrY2q9tKmTFqapWRpL39vJMfvYaGK6USBiTFrIFEJfmSmKBaB8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784037974; c=relaxed/simple; bh=wjWPKE4gokVm0n43Fz8OrYiTdEX4ZJIt+9rA3rzslZA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rw6w7MZJbACmuJgp4s+3IwRtl2R86wwVcDiDfv0+MRpASFYvJtjJ97K/FXDFxeXTEyljNPK+372X6fImBtu8thzzH9s5cSuj+RuvsLdXGjF9CUkcHoTFF//gIUdgWgPW9fhIMFkO6O5rU7wu1Oa2gbyV7eEUs2pPzV4lJ43oG+g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=UsBpoovP; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="UsBpoovP" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BBABA1576; Tue, 14 Jul 2026 07:06:07 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.2.208.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 923CB3F7B4; Tue, 14 Jul 2026 07:06:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784037972; bh=wjWPKE4gokVm0n43Fz8OrYiTdEX4ZJIt+9rA3rzslZA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=UsBpoovPpZ85RSIZfXEnSBfVHOZtFnPkX47Kj5gg3LsgzJNhCVgTUWCtTOeVOPaNp HKjlV2fnQGGYMeGqcjyozlJa7a3QA1IlDMrT8hf3JRzN2w2i+9FSRlqOzr8/QB6/Qf Q0z0BAmzTk1fTpNEZ3NiarWVCe9KoxmszHFZ5aSw= From: Kevin Brodsky Date: Tue, 14 Jul 2026 15:03:57 +0100 Subject: [PATCH 08/22] powerpc: mm: use mm_is_kernel() for kernel mm checks Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260714-remove_pgtable_cdtor-v1-8-44be8a7685d7@arm.com> References: <20260714-remove_pgtable_cdtor-v1-0-44be8a7685d7@arm.com> In-Reply-To: <20260714-remove_pgtable_cdtor-v1-0-44be8a7685d7@arm.com> To: linux-mm@kvack.org Cc: Kevin Brodsky , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Pasha Tatashin , Russell King , Catalin Marinas , Will Deacon , Ryan Roberts , linux-arm-kernel@lists.infradead.org, Huacai Chen , loongarch@lists.linux.dev, "James E.J. Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Gerald Schaefer , linux-s390@vger.kernel.org, "David S. Miller" , Andreas Larsson , sparclinux@vger.kernel.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Ning Sun , x86@kernel.org, tboot-devel@lists.sourceforge.net, Ard Biesheuvel , Ilias Apalodimas , linux-efi@vger.kernel.org, Vishal Moola , Alistair Popple , "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1784037902; l=2458; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=wjWPKE4gokVm0n43Fz8OrYiTdEX4ZJIt+9rA3rzslZA=; b=mGXIMwx7mP+wc+PdjO+ERefisoZsiZf5NJNBVQYllixOIGkiZykJ/6wIrBXI36cbJ4lbGAtZA wL42KEsLctGAHh95szgDEyWgp6+51aO6Iy65UQOmRkiEbYbzhv701ws X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= The new MMF_KERNEL flag identifies kernel-owned mm's. Checking the flag with mm_is_kernel() is preferred over comparing directly against &init_mm. No functional change, as only init_mm has MMF_KERNEL set for now. Assisted-by: Codex:GPT-5.5 Signed-off-by: Kevin Brodsky --- arch/powerpc/include/asm/pgalloc.h | 2 +- arch/powerpc/mm/book3s64/pgtable.c | 2 +- arch/powerpc/mm/mmu_context.c | 2 +- arch/powerpc/mm/pgtable.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/pgalloc.h b/arch/powerpc/include/asm/pgalloc.h index 3a971e2a8c73..88acccc5b06e 100644 --- a/arch/powerpc/include/asm/pgalloc.h +++ b/arch/powerpc/include/asm/pgalloc.h @@ -7,7 +7,7 @@ #ifndef MODULE static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp) { - if (unlikely(mm == &init_mm)) + if (unlikely(mm_is_kernel(mm))) return gfp; return gfp | __GFP_ACCOUNT; } diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index 85ab6723c8f2..eb365f7c8907 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -395,7 +395,7 @@ static pmd_t *__alloc_for_pmdcache(struct mm_struct *mm) struct ptdesc *ptdesc; gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO; - if (mm == &init_mm) + if (mm_is_kernel(mm)) gfp &= ~__GFP_ACCOUNT; ptdesc = pagetable_alloc(gfp, 0); if (!ptdesc) diff --git a/arch/powerpc/mm/mmu_context.c b/arch/powerpc/mm/mmu_context.c index 3e3af29b4523..b51934c511f3 100644 --- a/arch/powerpc/mm/mmu_context.c +++ b/arch/powerpc/mm/mmu_context.c @@ -48,7 +48,7 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, /* Mark this context has been used on the new CPU */ if (!cpumask_test_cpu(cpu, mm_cpumask(next))) { - VM_WARN_ON_ONCE(next == &init_mm); + VM_WARN_ON_ONCE(mm_is_kernel(next)); cpumask_set_cpu(cpu, mm_cpumask(next)); inc_mm_active_cpus(next); diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index a9be337be3e4..d04f4fecfc7c 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -393,7 +393,7 @@ void assert_pte_locked(struct mm_struct *mm, unsigned long addr) pte_t *pte; spinlock_t *ptl; - if (mm == &init_mm) + if (mm_is_kernel(mm)) return; pgd = mm->pgd + pgd_index(addr); BUG_ON(pgd_none(*pgd)); -- 2.51.2