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 0585C47D92B; Tue, 22 Sep 2026 15:38:26 +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=1790091508; cv=none; b=LlSK7+WpXyLzWI3bVCLpAB1mkw9bzqZA+ZqZmVcgp3g0fi9oietl31BDsNQZeeIswebDWsYMTAZimlEMCwr7cjPWTT8LnVwWWYhnFOYAQl5IH+8cIiq0d3AMqmnhINKvd7zcbNSEwzNmLtW8XurJy/Xcvv0F7UuAgymz/Q1Njd0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790091508; c=relaxed/simple; bh=uQXm1gV0hImCHIW2c39SJsX9YEkAV3QIf8B4ruAyqy0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kNL5RgfwYtX7KCt7l1XVdR5udhe6c2/pIExAWkQUzhPnenfWHTRtDdu/70yr4ioPx7ScEQ1hDSsaap/r5xx04YNYplvHQ+Lq/tn90h+qat2E5yQ35+/f/8/08oWqUBjBnCg2L8muYx/kX9RTzv+GGokNG2tomAPI8CIIWBWM8Sk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hczF2y71; 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="hczF2y71" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30E801F000FF; Tue, 22 Sep 2026 15:38:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790091506; bh=BckCZCGc4vzG9wqcN+JQhNHkdFRqc5QwTzQVV8XEoLM=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=hczF2y71AlJMYpu4N67vVKHZULkCEsC1jdewMZf7zTZ68jmEJbkuYDjvGHkzAlrru VVTdGRic7q6bI25hOgzKaKwMw1bldXcdOufOkY/y9kjsEE31UuSkp1gvLn2NcaKv3/ 6JD+BuUCvN7AGim/QrSZ2leQdE8ROIUA54ZaSPB0+pmV/wH6SN54d4ek6/0IDIuLN5 OQ8VIEYaHaNBcfKUBUIJ4RnRmH+5ZkL1rbIqcZqm3fTH42Wba2SJklOLkUaC+5ffP0 2NWVTmu21ufgyXLytMnKYyfbzPaGAjDW1X9n1/hKR8g84+eML9mer0DECeMEkjiACf VOOKF2njdqfCA== From: "Lorenzo Stoakes (ARM)" Date: Tue, 22 Sep 2026 16:35:36 +0100 Subject: [PATCH v4 05/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for arc, microblaze, xtensa 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: <20260922-rcu-pagetable-freeing-v4-5-fe1ad1f1e303@kernel.org> References: <20260922-rcu-pagetable-freeing-v4-0-fe1ad1f1e303@kernel.org> In-Reply-To: <20260922-rcu-pagetable-freeing-v4-0-fe1ad1f1e303@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=4685; i=ljs@kernel.org; h=from:subject:message-id; bh=uQXm1gV0hImCHIW2c39SJsX9YEkAV3QIf8B4ruAyqy0=; b=owGbwMvMwCV2fu7ZrsZH9SKMp9WSGLI2LcjeUX3q7EYBFY/bNxY03exr0ZGNiVeaKWfIdXDJF m4n8YynHaUsDGJcDLJiiizPv4jvDxIJm9d5wd8NZg4rE8gQBi5OAZjILjuGf9pveG59W2cgdnDr 3ZkaK3JCSw2vTI6ZuPlekWtIEVtr8wRGhslfOw5PWHx2+0o25qi9LnzJ5S9mv1t6/i+7ibx3QKn fCVYA X-Developer-Key: i=ljs@kernel.org; a=openpgp; fpr=E7F417BF5214569E89D04F46CF9DCD8A81E27F14 Each of these architectures directly free page tables without routing these changes through tlb_remove_ptdesc(). The use of tlb_remove_ptdesc() is required for CONFIG_MMU_GATHER_RCU_TABLE_FREE to correctly free page tables under RCU, so simply update these architectures to use these functions. Since none of the architectures share page tables or do anything unusual, nothing complicated is required here. Therefore this is simply a mechanical change - convert __pud_free_tlb(), __pmd_free_tlb() and __pte_free_tlb() to use tlb_remove_ptdesc() as required. At the point this is in place, all mmu_gather page table freeing is performed under RCU, and thus MMU_GATHER_RCU_TABLE_FREE is selected for each architecture. Note that CONFIG_MMU_GATHER_RCU_TABLE_FREE is dependent on CONFIG_MMU for xtensa to reflect the fact that nommu does not implement page table gathering. This forms part of an overall effort to switch every architecture to this mode. Acked-by: Kiryl Shutsemau (Meta) Signed-off-by: Lorenzo Stoakes (ARM) --- arch/arc/Kconfig | 1 + arch/arc/include/asm/pgalloc.h | 6 +++--- arch/microblaze/Kconfig | 1 + arch/microblaze/include/asm/pgalloc.h | 2 +- arch/xtensa/Kconfig | 1 + arch/xtensa/include/asm/tlb.h | 2 +- 6 files changed, 8 insertions(+), 5 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 2ed7186c81c5..7a7542b61823 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -47,6 +47,7 @@ config ARC select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN select LOCK_MM_AND_FIND_VMA + select MMU_GATHER_RCU_TABLE_FREE select MODULES_USE_ELF_RELA select OF select OF_EARLY_FLATTREE diff --git a/arch/arc/include/asm/pgalloc.h b/arch/arc/include/asm/pgalloc.h index dfae070fe8d5..9b6c37f92e97 100644 --- a/arch/arc/include/asm/pgalloc.h +++ b/arch/arc/include/asm/pgalloc.h @@ -72,7 +72,7 @@ static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp) set_p4d(p4dp, __p4d((unsigned long)pudp)); } -#define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd) +#define __pud_free_tlb(tlb, pmd, addr) tlb_remove_ptdesc((tlb), virt_to_ptdesc(pmd)) #endif @@ -83,10 +83,10 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) set_pud(pudp, __pud((unsigned long)pmdp)); } -#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) +#define __pmd_free_tlb(tlb, pmd, addr) tlb_remove_ptdesc((tlb), virt_to_ptdesc(pmd)) #endif -#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) +#define __pte_free_tlb(tlb, pte, addr) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) #endif /* _ASM_ARC_PGALLOC_H */ diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 484ebb3baedf..af7e821e96c1 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -41,6 +41,7 @@ config MICROBLAZE select PCI_SYSCALL if PCI select CPU_NO_EFFICIENT_FFS select MMU_GATHER_NO_RANGE + select MMU_GATHER_RCU_TABLE_FREE select SPARSE_IRQ select ZONE_DMA select TRACE_IRQFLAGS_SUPPORT diff --git a/arch/microblaze/include/asm/pgalloc.h b/arch/microblaze/include/asm/pgalloc.h index 084a8a0dc239..ffee6a009219 100644 --- a/arch/microblaze/include/asm/pgalloc.h +++ b/arch/microblaze/include/asm/pgalloc.h @@ -25,7 +25,7 @@ extern void __bad_pte(pmd_t *pmd); extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); -#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, (pte)) +#define __pte_free_tlb(tlb, pte, addr) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) #define pmd_populate(mm, pmd, pte) \ (pmd_val(*(pmd)) = (unsigned long)page_address(pte)) diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index f2f9cd9cde50..33c4caee30e2 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -55,6 +55,7 @@ config XTENSA select HAVE_VIRT_CPU_ACCOUNTING_GEN select IRQ_DOMAIN select LOCK_MM_AND_FIND_VMA + select MMU_GATHER_RCU_TABLE_FREE if MMU select MODULES_USE_ELF_RELA select PERF_USE_VMALLOC select TRACE_IRQFLAGS_SUPPORT diff --git a/arch/xtensa/include/asm/tlb.h b/arch/xtensa/include/asm/tlb.h index 8c3ceb427018..6fb7b78154f6 100644 --- a/arch/xtensa/include/asm/tlb.h +++ b/arch/xtensa/include/asm/tlb.h @@ -16,7 +16,7 @@ #include -#define __pte_free_tlb(tlb, pte, address) pte_free((tlb)->mm, pte) +#define __pte_free_tlb(tlb, pte, address) tlb_remove_ptdesc((tlb), page_ptdesc(pte)) void check_tlb_sanity(void); -- 2.55.0