From patchwork Fri Sep 20 05:30:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 13808139 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AE6A8CF58CD for ; Fri, 20 Sep 2024 05:31:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=2w4EVdzKGq1bMXpM7wXfYtHzRnqiWVl7X2bJSIO3+Ss=; b=xa0n+u/rqi2wzl kRgJG5sh+uMnJxf4SGG5SnnxfvhfFE57enrWzMDG1TXkVjnkHSfOxLe178nz9RL6EkfOrMidYdl1B /36sGlWtvn2huAqET8e37bc7+tWfQSS3i1uzYZTd8gZP/62006LCBl4kWzxa+Ypk1a7DH5mEYWARZ uobb0L/7OFJ3ZVj1emGx3u+8OQXIOE7PipcIUppmirraBUwugMOcLgQQ0qttHA0R+FrngytpRjzYW Ob+d6AqO0cRKFGjcWCQHYuYxr1NY+Xa4muhN1RC7U8d7qhX7ocjGzJ+uhIbVgDRMhU1awoAjIVNGQ F7lidsU0j34roA3TaNog==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1srWEU-0000000BTvt-2iT4; Fri, 20 Sep 2024 05:31:06 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1srWDy-0000000BTrg-29Rc for linux-riscv@lists.infradead.org; Fri, 20 Sep 2024 05:30:36 +0000 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 A223AFEC; Thu, 19 Sep 2024 22:30:55 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.35.184]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EFA933F66E; Thu, 19 Sep 2024 22:30:21 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: Anshuman Khandual , Paul Walmsley , Palmer Dabbelt , Thomas Gleixner , Dave Hansen , David Hildenbrand , Ryan Roberts , x86@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] mm: Move set_pxd_safe() helpers from generic to platform Date: Fri, 20 Sep 2024 11:00:17 +0530 Message-Id: <20240920053017.2514920-1-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240919_223034_642104_E4A8C5E8 X-CRM114-Status: GOOD ( 11.83 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org set_pxd_safe() helpers that serve a specific purpose for both x86 and riscv platforms, do not need to be in the common memory code. Otherwise they just unnecessarily make the common API more complicated. This moves the helpers from common code to platform instead. Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Thomas Gleixner Cc: Dave Hansen Cc: David Hildenbrand Cc: Ryan Roberts Cc: Andrew Morton Cc: x86@kernel.org Cc: linux-mm@kvack.org Cc: linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org Suggested-by: David Hildenbrand Signed-off-by: Anshuman Khandual --- arch/riscv/include/asm/pgtable.h | 19 ++++++++++++++++ arch/x86/include/asm/pgtable.h | 37 +++++++++++++++++++++++++++++++ include/linux/pgtable.h | 38 -------------------------------- 3 files changed, 56 insertions(+), 38 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 089f3c9f56a3..39ca652c5ebe 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -957,6 +957,25 @@ void misc_mem_init(void); extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) +/* + * Use set_p*_safe(), and elide TLB flushing, when confident that *no* + * TLB flush will be required as a result of the "set". For example, use + * in scenarios where it is known ahead of time that the routine is + * setting non-present entries, or re-setting an existing entry to the + * same value. Otherwise, use the typical "set" helpers and flush the + * TLB. + */ +#define set_p4d_safe(p4dp, p4d) \ +({ \ + WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \ + set_p4d(p4dp, p4d); \ +}) + +#define set_pgd_safe(pgdp, pgd) \ +({ \ + WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \ + set_pgd(pgdp, pgd); \ +}) #endif /* !__ASSEMBLY__ */ #endif /* _ASM_RISCV_PGTABLE_H */ diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index e39311a89bf4..fefb52bb6b4d 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1701,6 +1701,43 @@ bool arch_is_platform_page(u64 paddr); #define arch_is_platform_page arch_is_platform_page #endif +/* + * Use set_p*_safe(), and elide TLB flushing, when confident that *no* + * TLB flush will be required as a result of the "set". For example, use + * in scenarios where it is known ahead of time that the routine is + * setting non-present entries, or re-setting an existing entry to the + * same value. Otherwise, use the typical "set" helpers and flush the + * TLB. + */ +#define set_pte_safe(ptep, pte) \ +({ \ + WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \ + set_pte(ptep, pte); \ +}) + +#define set_pmd_safe(pmdp, pmd) \ +({ \ + WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \ + set_pmd(pmdp, pmd); \ +}) + +#define set_pud_safe(pudp, pud) \ +({ \ + WARN_ON_ONCE(pud_present(*pudp) && !pud_same(*pudp, pud)); \ + set_pud(pudp, pud); \ +}) + +#define set_p4d_safe(p4dp, p4d) \ +({ \ + WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \ + set_p4d(p4dp, p4d); \ +}) + +#define set_pgd_safe(pgdp, pgd) \ +({ \ + WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \ + set_pgd(pgdp, pgd); \ +}) #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_PGTABLE_H */ diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 2a6a3cccfc36..0bf88e505aad 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1050,44 +1050,6 @@ static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b) } #endif -/* - * Use set_p*_safe(), and elide TLB flushing, when confident that *no* - * TLB flush will be required as a result of the "set". For example, use - * in scenarios where it is known ahead of time that the routine is - * setting non-present entries, or re-setting an existing entry to the - * same value. Otherwise, use the typical "set" helpers and flush the - * TLB. - */ -#define set_pte_safe(ptep, pte) \ -({ \ - WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \ - set_pte(ptep, pte); \ -}) - -#define set_pmd_safe(pmdp, pmd) \ -({ \ - WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \ - set_pmd(pmdp, pmd); \ -}) - -#define set_pud_safe(pudp, pud) \ -({ \ - WARN_ON_ONCE(pud_present(*pudp) && !pud_same(*pudp, pud)); \ - set_pud(pudp, pud); \ -}) - -#define set_p4d_safe(p4dp, p4d) \ -({ \ - WARN_ON_ONCE(p4d_present(*p4dp) && !p4d_same(*p4dp, p4d)); \ - set_p4d(p4dp, p4d); \ -}) - -#define set_pgd_safe(pgdp, pgd) \ -({ \ - WARN_ON_ONCE(pgd_present(*pgdp) && !pgd_same(*pgdp, pgd)); \ - set_pgd(pgdp, pgd); \ -}) - #ifndef __HAVE_ARCH_DO_SWAP_PAGE static inline void arch_do_swap_page_nr(struct mm_struct *mm, struct vm_area_struct *vma,