From patchwork Tue Apr 9 19:22:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13623111 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 C0127157E76 for ; Tue, 9 Apr 2024 19:26:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712690763; cv=none; b=BdfHpEKFBBNyx84QZXHAQNr4pvicxz0NpJEeA41cCETJ46NgG27fUr/3KZKiqoOVhnjwaxcWDHvEb6XUDICnb3/fRa/q5eC2dnwDj05mBnaSQpYxKh8illwgBgoEGtM32u+p4NV+9WNWbaAEBaeSjeFJPiwHYDX9kGUEHO5RRWo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712690763; c=relaxed/simple; bh=B9VW3LrHsx1zgfIxNNfkZUFwrAR512abN6D1CTPxM7s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h4reTJ/BGxFqfqTiTrPlqjWhAYxuCa6OQkLwuNFcSEUuhqyGSV3+xWrYPxKZEUhacIXKKWSoAaEJ9ih8m4k/nh/2EyD9g6GckWkIZ1AUgQXHSMbPJXuFVAZhs9+nU/bGpk+DFxuieRWBkjF+n1LvTFm/uSFPIx3zj83JLGXqlvg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bPc2i8YR; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bPc2i8YR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1712690761; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oja6emUhi7xfrQgd9sof78Ea2rpQTjm332kNskpFfoE=; b=bPc2i8YRQYsxrmcaDLAVUw2ZHdnIyrVTqYswk6d+dbK2v42dRBWAnKOj9Pg47o9qk+tXOA 6Cz4SamN/OWbWxjgP+KM2I4CovHLVPRLdzapkW78DDH75oK40ZZunWSCb4zljW9C8luWSk qu4YZzTrBLE65z2VovTQOE3FEKuQuKw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-216-euyj5-iiOp6e2NecV838wQ-1; Tue, 09 Apr 2024 15:25:57 -0400 X-MC-Unique: euyj5-iiOp6e2NecV838wQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 262C9800198; Tue, 9 Apr 2024 19:25:56 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.39.192.106]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0B6EB40B497D; Tue, 9 Apr 2024 19:25:43 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, cgroups@vger.kernel.org, linux-sh@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, David Hildenbrand , Andrew Morton , "Matthew Wilcox (Oracle)" , Peter Xu , Ryan Roberts , Yin Fengwei , Yang Shi , Zi Yan , Jonathan Corbet , Hugh Dickins , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Chris Zankel , Max Filippov , Muchun Song , Miaohe Lin , Naoya Horiguchi , Richard Chang Subject: [PATCH v1 12/18] sh/mm/cache: use folio_mapped() in copy_from_user_page() Date: Tue, 9 Apr 2024 21:22:55 +0200 Message-ID: <20240409192301.907377-13-david@redhat.com> In-Reply-To: <20240409192301.907377-1-david@redhat.com> References: <20240409192301.907377-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 We want to limit the use of page_mapcount() to the places where it is absolutely necessary. We're already using folio_mapped in copy_user_highpage() and copy_to_user_page() for a similar purpose so ... let's also simply use it for copy_from_user_page(). There is no change for small folios. Likely we won't stumble over many large folios on sh in that code either way. Signed-off-by: David Hildenbrand --- arch/sh/mm/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c index 9bcaa5619eab..d8be352e14d2 100644 --- a/arch/sh/mm/cache.c +++ b/arch/sh/mm/cache.c @@ -84,7 +84,7 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page, { struct folio *folio = page_folio(page); - if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) && + if (boot_cpu_data.dcache.n_aliases && folio_mapped(folio) && test_bit(PG_dcache_clean, &folio->flags)) { void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(dst, vfrom, len);