From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BD499CFD313 for ; Mon, 24 Nov 2025 13:22:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 03E6A6B0024; Mon, 24 Nov 2025 08:22:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id F31536B0027; Mon, 24 Nov 2025 08:22:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E1F226B0028; Mon, 24 Nov 2025 08:22:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id CDF5C6B0024 for ; Mon, 24 Nov 2025 08:22:53 -0500 (EST) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 02C9F588CD for ; Mon, 24 Nov 2025 13:22:50 +0000 (UTC) X-FDA: 84145565742.14.8435A44 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf05.hostedemail.com (Postfix) with ESMTP id 4FA5F100017 for ; Mon, 24 Nov 2025 13:22:49 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf05.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1763990569; a=rsa-sha256; cv=none; b=luVDswsb/OTetb9msYWQWEhNyXauOOQ/PioFQnQN79hxZMsihqTIjKJi6+aZpPcyy/DwBD EYQMtP6co59fveqD7k5kvgT7YrSGvP1fQBhY1hSrrYnS+rQT8dFZKec6rO3Gh/tXeL5D90 LErGjsqO/qDG+2peaKp+KtxsjCV/9rc= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf05.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1763990569; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tlUmM8azucNOPukRL/xJOIAfeIfrDcQcwL0QSiE8v0E=; b=xy3UfyMAcMKsswDkeY5p9/qiBbcBT1UNstl0uhuxsU9b9/b2aFzode9V+Ae7kZ/Fu3W3ET SOhuKVGmG9HXap6Lxyw9NgasuE5sM23nIemJPPqRaQJO10OmC/CG9qgqHYWd6smTT42v7u QGeKw/TnehRnJbjzwaoXy00qPwjyNVg= 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 B5B121477; Mon, 24 Nov 2025 05:22:40 -0800 (PST) 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 120A13F73B; Mon, 24 Nov 2025 05:22:42 -0800 (PST) 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" , David Woodhouse , "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 , "Ritesh Harjani (IBM)" , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Venkat Rao Bagalkote , 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 v5 01/12] powerpc/64s: Do not re-activate batched TLB flush Date: Mon, 24 Nov 2025 13:22:17 +0000 Message-ID: <20251124132228.622678-2-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251124132228.622678-1-kevin.brodsky@arm.com> References: <20251124132228.622678-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 4FA5F100017 X-Stat-Signature: bt5uxjisrr1ttisk9noz8dt6fmxihmxr X-HE-Tag: 1763990569-869491 X-HE-Meta: U2FsdGVkX19OFWHoerPnz8mi4uYIBP3niPt8yUZBNUqa/BiDS+zG5pba+Lcgu25dAYx3joPkHjA0/SPX7v3YWpa7uKHNdh9XppYD50iXRemCMwfkfOqbAAYicBhuk6GMjvhVAferdUDiZH10pG3Kl75OIq3M8T7Bxs6LNPDjVz1Vs2+CD7ofGSB04jgftyLMjj/n75IQ4wH3BH77yLNODBRcIL/J+QyyFReRvh+ML+ANilbaMuQUq4QwzoBC/su/y5S035xIJ0U9Leb6CItgH1tulV36M2DPmXiFIuAqBG06UVE49AoD+wOGNiylL+b6TLxj4NDaMtZRVSWy5uO/gb885DOhOAUpfzAxLMXR4Iy/e90qz/mTyBZmxjS0RqKixRuW6f+q7qgIPOdWRhtZbZGpOP26u822nlJ+x9lZ5veO6BWGo3yP+RL2lwyu40N69dt1JvbB2rym07dPwXP0tt8pd5XhkBymDyMELcmmLH//0unpmSIobVprzj3IDMOlH0NbI4mqCmJ2T+HmAReyAS5Wi53Co1X74ZaMpKB+zcUWDFgv4mfmuW1gMJweZva7hcoSBVvjqGoqFkax2f4qD5pT4IuL0vlVMFsz08hJj4qWoLq2y+MMvAoHld1czi3mJ0Nfa0rqfF6dzlGMaegoopzN5d2bESatfYncTxd2RYJXiS0bdh8svyAsxe9x0gBOT9webqnityKFOopeGWU8t19DHxwN7anAx/1WE1UCb0t14dNRh2qkSdbpjCwDLO9MZKnqd92Ri6OYMZyThkwPApvF3V48nhFZgSirrKM3iIXM3fcqoaR7sUucsEeqYCA0SnNSTwDUH0HJfnwqrR/DNK+xfoiz/DPXdesKhnDjHtXhE+SR+nCqh6I6kp/MW2m7PpcJ0/y5RLBYUDXhNVMyPhw8OJ49QpypvepIddIS79l4+qFDvFxW25afLOS/RU2ldx9PaD+qU6SHLI359UD IMzVgTgY IZVEeg/rqd6aZGXcilcOmLoqNd3fBg17iuTv2BSypfrQSKoolFzt9rmVkOiVDMo4tclqB5PsRCPPm9yLKj7mTogkcC/mJ9UlUH/xBEjsHP51wkcBTA1p8RoSC1YVn1E75cbl+TkscSMHUHztl9lT2I6puLpWdMyO4QHp1gfNAlZeIh4va8nphlu7b+beBy6VSss7RELT3VmUz0FGwYyKQrnTfU+WeI2vo7W53eGfXFLlD0yIyoj5ydWxaNTyqc3Owz42S X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Alexander Gordeev Since commit b9ef323ea168 ("powerpc/64s: Disable preemption in hash lazy mmu mode") a task can not be preempted while in lazy MMU mode. Therefore, the batch re-activation code is never called, so remove it. Signed-off-by: Alexander Gordeev Reviewed-by: David Hildenbrand Reviewed-by: Ritesh Harjani (IBM) Reviewed-by: Ryan Roberts Signed-off-by: Kevin Brodsky --- arch/powerpc/include/asm/thread_info.h | 2 -- arch/powerpc/kernel/process.c | 25 ------------------------- 2 files changed, 27 deletions(-) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index b0f200aba2b3..97f35f9b1a96 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -154,12 +154,10 @@ void arch_setup_new_exec(void); /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ -#define TLF_LAZY_MMU 3 /* tlb_batch is active */ #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ #define _TLF_NAPPING (1 << TLF_NAPPING) #define _TLF_SLEEPING (1 << TLF_SLEEPING) -#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) #ifndef __ASSEMBLER__ diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index eb23966ac0a9..9237dcbeee4a 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1281,9 +1281,6 @@ struct task_struct *__switch_to(struct task_struct *prev, { struct thread_struct *new_thread, *old_thread; struct task_struct *last; -#ifdef CONFIG_PPC_64S_HASH_MMU - struct ppc64_tlb_batch *batch; -#endif new_thread = &new->thread; old_thread = ¤t->thread; @@ -1291,14 +1288,6 @@ struct task_struct *__switch_to(struct task_struct *prev, WARN_ON(!irqs_disabled()); #ifdef CONFIG_PPC_64S_HASH_MMU - batch = this_cpu_ptr(&ppc64_tlb_batch); - if (batch->active) { - current_thread_info()->local_flags |= _TLF_LAZY_MMU; - if (batch->index) - __flush_tlb_pending(batch); - batch->active = 0; - } - /* * On POWER9 the copy-paste buffer can only paste into * foreign real addresses, so unprivileged processes can not @@ -1369,20 +1358,6 @@ struct task_struct *__switch_to(struct task_struct *prev, */ #ifdef CONFIG_PPC_BOOK3S_64 -#ifdef CONFIG_PPC_64S_HASH_MMU - /* - * This applies to a process that was context switched while inside - * arch_enter_lazy_mmu_mode(), to re-activate the batch that was - * deactivated above, before _switch(). This will never be the case - * for new tasks. - */ - if (current_thread_info()->local_flags & _TLF_LAZY_MMU) { - current_thread_info()->local_flags &= ~_TLF_LAZY_MMU; - batch = this_cpu_ptr(&ppc64_tlb_batch); - batch->active = 1; - } -#endif - /* * Math facilities are masked out of the child MSR in copy_thread. * A new task does not need to restore_math because it will -- 2.51.2