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 05FED311955; Wed, 15 Oct 2025 08:28:26 +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=1760516910; cv=none; b=LdlbWSvq8KtRQ6vnfmpQgDuPOdQDcCHJ8fyIdIOIP9mRFDeDzu1u27C8zuAdzh4KVJ6iW1GWUZXx19k1TImTM7MyDDQcs2WdJuaaLn+iuIeNs1B7gciHb1fkXbsQbXGgJp7IsikLVE4Pd2pCjDQOx/HuOb9m7EF/KbJEpO+qNQY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760516910; c=relaxed/simple; bh=99U1dWTrnOktLyvO071Mzx20A3voi2OT36Nl9bPWvE0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ar+8K1Txoxds06if6VGxbjX5FBy/0OEGoTgQTVsTBbus7qQMhTuyYmrUYDHzZ0/UfDMtYkA9OlJ2nSoWhycjUVENvC/mpFvkMlgEQ5eiKoJMdv2M4H7Zj1X6AGQk4TyvHtYZqdwoklXpGwpHWTSfx9TBdlXWAj2P5Z88JQxnIOE= 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; 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 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 E5B262308; Wed, 15 Oct 2025 01:28:17 -0700 (PDT) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8ACDB3F66E; Wed, 15 Oct 2025 01:28:20 -0700 (PDT) From: Kevin Brodsky To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Alexander Gordeev , Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Subject: [PATCH v3 08/13] arm64: mm: replace TIF_LAZY_MMU with in_lazy_mmu_mode() Date: Wed, 15 Oct 2025 09:27:22 +0100 Message-ID: <20251015082727.2395128-9-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20251015082727.2395128-1-kevin.brodsky@arm.com> References: <20251015082727.2395128-1-kevin.brodsky@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The generic lazy_mmu layer now tracks whether a task is in lazy MMU mode. As a result we no longer need a TIF flag for that purpose - let's use the new in_lazy_mmu_mode() helper instead. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/pgtable.h | 16 +++------------- arch/arm64/include/asm/thread_info.h | 3 +-- 2 files changed, 4 insertions(+), 15 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index f15ca4d62f09..944e512767db 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -62,30 +62,21 @@ static inline void emit_pte_barriers(void) static inline void queue_pte_barriers(void) { - unsigned long flags; - if (in_interrupt()) { emit_pte_barriers(); return; } - flags = read_thread_flags(); - - if (flags & BIT(TIF_LAZY_MMU)) { - /* Avoid the atomic op if already set. */ - if (!(flags & BIT(TIF_LAZY_MMU_PENDING))) - set_thread_flag(TIF_LAZY_MMU_PENDING); - } else { + if (in_lazy_mmu_mode()) + test_and_set_thread_flag(TIF_LAZY_MMU_PENDING); + else emit_pte_barriers(); - } } static inline void arch_enter_lazy_mmu_mode(void) { if (in_interrupt()) return; - - set_thread_flag(TIF_LAZY_MMU); } static inline void arch_flush_lazy_mmu_mode(void) @@ -103,7 +94,6 @@ static inline void arch_leave_lazy_mmu_mode(void) return; arch_flush_lazy_mmu_mode(); - clear_thread_flag(TIF_LAZY_MMU); } #ifdef CONFIG_TRANSPARENT_HUGEPAGE diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index f241b8601ebd..4ff8da0767d9 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -84,8 +84,7 @@ void arch_setup_new_exec(void); #define TIF_SME_VL_INHERIT 28 /* Inherit SME vl_onexec across exec */ #define TIF_KERNEL_FPSTATE 29 /* Task is in a kernel mode FPSIMD section */ #define TIF_TSC_SIGSEGV 30 /* SIGSEGV on counter-timer access */ -#define TIF_LAZY_MMU 31 /* Task in lazy mmu mode */ -#define TIF_LAZY_MMU_PENDING 32 /* Ops pending for lazy mmu mode exit */ +#define TIF_LAZY_MMU_PENDING 31 /* Ops pending for lazy mmu mode exit */ #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) -- 2.47.0