From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 237484EA394; Fri, 25 Sep 2026 20:12:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790367138; cv=none; b=jLMPU2phZfGryGNJEQjiHr+dySvxYf0rGBrRIbpUIQFL2QWWIBYkbPO20alDKKlnQtPuhB4v4w3ntM/utD31mujICwi7v/csoShPUOc8+JS+9Dw+yAen7qHEoS1feTbYTwb4IbHMD2thw+U5IYVFQD69odbDUmNU0+4ya4aKJqc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790367138; c=relaxed/simple; bh=7tmFad46Ay6V6b5/mmZvG/hiVDuSFgYhQDgYlo78TeM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=bR7QPhdADmKnwfbO+41AIhuxABzuNs+lSxDwIlF62xSc0LdiG7q+paGSP48r1l7TV4IT+lkx17bBz7Egakv1RIfmtClYTmFxmqtr8uDOsLABi1/AHnrIYUa+vEj4rgaHlcwXx7U5LNK5M0gtE2EX4a2ocgJTznPOYjPMYgAwAKM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gKh/gqLZ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gKh/gqLZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A0DBF1F00893; Fri, 25 Sep 2026 20:11:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790367132; bh=0/RwvDc+Yn6qQyxIlipbe7ZS0nZ7PlvA6+VjYxgRBPE=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=gKh/gqLZ6tuLTMtMolwZ0R1z1pkLXe1CHwiE0D9GHHPFGtRxoVceWHxaxOOHwCjMU SSgWnP6WPc7OgBWvdah+8+s+y77sVEVsh+CU9JRyYmPD6Pbx8Vf+acsnxrR7dTdMSC jSKkFayThIUdZ+rkcCk++LpkI2mYEdliqnGUkvuUt9w+l/+KUwA/SoIM1lWVcJnj3T bKBw27PYXRqzRB/NLanfe7hFILrPCnNNQIxaNY8U6Un/Y/FOBiDXf/4VTrKQndkLoZ J7yLnY4Xal0/44DqVhGwq19g6cw9R6l1o/4ZWhTGvvzpFXJGNOl8ShkEZibRSUgYR/ 1+cjtQGpV3/xw== From: "Lorenzo Stoakes (ARM)" Date: Fri, 25 Sep 2026 21:09:41 +0100 Subject: [PATCH v5 06/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for sparc64 Precedence: bulk X-Mailing-List: linux-doc@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: <20260925-rcu-pagetable-freeing-v5-6-31e91065fea4@kernel.org> References: <20260925-rcu-pagetable-freeing-v5-0-31e91065fea4@kernel.org> In-Reply-To: <20260925-rcu-pagetable-freeing-v5-0-31e91065fea4@kernel.org> To: Andrew Morton , David Hildenbrand , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Guo Ren , Brian Cain , Geert Uytterhoeven , Dinh Nguyen , Simon Schuster , Jonas Bonn , Stefan Kristiansson , Stafford Horne , Rich Felker , John Paul Adrian Glaubitz , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Russell King , Vineet Gupta , Michal Simek , Chris Zankel , Max Filippov , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , "David S. Miller" , Andreas Larsson , Richard Henderson , Matt Turner , Magnus Lindholm , Catalin Marinas , Mark Rutland , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , "Christophe Leroy (CS GROUP)" , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Arnd Bergmann , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jason Gunthorpe , John Hubbard , Peter Xu , Yoshinori Sato , Shakeel Butt , Jonathan Corbet , Randy Dunlap Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-snps-arc@lists.infradead.org, linux-arch@vger.kernel.org, sparclinux@vger.kernel.org, linux-alpha@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, Hugh Dickins , Qi Zheng , linux-doc@vger.kernel.org, "Lorenzo Stoakes (ARM)" X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2563; i=ljs@kernel.org; h=from:subject:message-id; bh=7tmFad46Ay6V6b5/mmZvG/hiVDuSFgYhQDgYlo78TeM=; b=owGbwMvMwCV2fu7ZrsZH9SKMp9WSGLK2XWW/YFoQrqOUEZLpL3zwHfvHV+1zGe5zBj351OHcx crT/3Z1RykLgxgXg6yYIsvzL+L7g0TC5nVe8HeDmcPKBDKEgYtTACZi68jIcHrDLoNNgikXeHUa 1+2/x5K/fEvyqyxb7m6H93+NspK3yjD8U/ZucWJc7HzE0fPCP8Mer73FC6ZeTq3deSvhoqnm48e TuQA= X-Developer-Key: i=ljs@kernel.org; a=openpgp; fpr=E7F417BF5214569E89D04F46CF9DCD8A81E27F14 Commit 4a0100f7546f ("sparc64: use RCU page table freeing") enabled CONFIG_MMU_GATHER_RCU_TABLE_FREE for SMP sparc64 architectures, expressly for GUP-fast page table walkers. Naturally, UP systems do not have to worry about concurrent GUP fast operations. However, CONFIG_PREEMPT_RCU is also available even on a UP system, so a future pure-RCU page table walker requires MMU_GATHER_RCU_TABLE_FREE to be enabled on UP, even if concurrent GUP fast is not possible there. To enable future pure-RCU page table walkers, enable MMU_GATHER_RCU_TABLE_FREE unconditionally. With this change, it is no longer necessary to have !CONFIG_SMP pgtable_free_tlb(), so also remove this now dead code. This forms part of an overall effort to switch every architecture to this mode. Acked-by: Kiryl Shutsemau (Meta) Tested-by: Lance Yang Acked-by: Lance Yang Signed-off-by: Lorenzo Stoakes (ARM) --- arch/sparc/Kconfig | 4 ++-- arch/sparc/include/asm/pgalloc_64.h | 8 -------- 2 files changed, 2 insertions(+), 10 deletions(-) diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index ab77d3f2536e..8d42ebc6d302 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -75,8 +75,8 @@ config SPARC64 select HAVE_FUNCTION_GRAPH_TRACER select HAVE_KRETPROBES select HAVE_KPROBES - select MMU_GATHER_RCU_TABLE_FREE if SMP - select HAVE_ARCH_TLB_REMOVE_TABLE if SMP + select MMU_GATHER_RCU_TABLE_FREE + select HAVE_ARCH_TLB_REMOVE_TABLE select MMU_GATHER_MERGE_VMAS select MMU_GATHER_NO_FLUSH_CACHE select HAVE_ARCH_TRANSPARENT_HUGEPAGE diff --git a/arch/sparc/include/asm/pgalloc_64.h b/arch/sparc/include/asm/pgalloc_64.h index caa7632be4c2..b5055d259b74 100644 --- a/arch/sparc/include/asm/pgalloc_64.h +++ b/arch/sparc/include/asm/pgalloc_64.h @@ -74,8 +74,6 @@ void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable); void pgtable_free(void *table, bool is_page); -#ifdef CONFIG_SMP - struct mmu_gather; void tlb_remove_table(struct mmu_gather *, void *); @@ -96,12 +94,6 @@ static inline void __tlb_remove_table(void *_table) is_page = true; pgtable_free(table, is_page); } -#else /* CONFIG_SMP */ -static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page) -{ - pgtable_free(table, is_page); -} -#endif /* !CONFIG_SMP */ static inline void __pte_free_tlb(struct mmu_gather *tlb, pte_t *pte, unsigned long address) -- 2.55.0