From nobody Sun Feb 8 15:57:55 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 0803E17109A for ; Mon, 25 Mar 2024 14:57:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711378654; cv=none; b=i0Y4DmcQeuZw1XyDexhzY+gtpe3CaeCLLh389hbzSKXW5Vq0lj3iLxpDyjdr+IjQp/4RZA4jjeFa3E1ufJqjTlb7FTxAuWvj3QXAIBjlqA83V9sT7aQhSCTAmEaRe9l2o9z3MTlKLC3pVP8ZLHVQT6cJhWSGWA5O1DjMNUJ0xl4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711378654; c=relaxed/simple; bh=ld+G+dRUeA3SkzfHmsCiXh/ZxBicMKWgeZS/KmjXsRA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=F9uhyVHbPUENRuYemg7Mr1LbC1IqorMWUURd67L/pN6TweL06aFi04cLjimnC2q7luyVltvFRtyjMbUpe9e6lJZmujjJHHuOa3DLYtVSU1hKZJ8mqqT+6RxXBiqsZLkMoSmPYzPpJX01zyNzmD1MudKb9TXPICFbrSiMOtP1FaQ= 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=igBchiAJ; arc=none smtp.client-ip=170.10.129.124 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="igBchiAJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1711378652; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/wvoO9gMxnE/h+72mDdUoxwDkamBxujn5JY0mQMrkk8=; b=igBchiAJfOwg7FNMXS/2ICLJooruBhQ66oPghG333qHmo6XDk4ZDCB6dEHbcoN/df0FYtp eCVhbd2LVguY3ESe+RRSNkrIRouwx5A+yHNaxQ9h4nA/8APTMoxuC5zCQy3RXACEaD4DKb EhbDmLc9YM0mltt1NBS0RTJX+vKzDTs= 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-207-ioNvZiFePKuhU6aVg6cs7g-1; Mon, 25 Mar 2024 10:57:25 -0400 X-MC-Unique: ioNvZiFePKuhU6aVg6cs7g-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (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 38444185A783; Mon, 25 Mar 2024 14:57:25 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.116.12]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4E4133C22; Mon, 25 Mar 2024 14:57:20 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org, rppt@kernel.org, Baoquan He Subject: [PATCH v2 2/6] mm/mm_init.c: remove the useless dma_reserve Date: Mon, 25 Mar 2024 22:56:42 +0800 Message-ID: <20240325145646.1044760-3-bhe@redhat.com> In-Reply-To: <20240325145646.1044760-1-bhe@redhat.com> References: <20240325145646.1044760-1-bhe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 Content-Type: text/plain; charset="utf-8" Now nobody calls set_dma_reserve() to set value for dma_reserve, remove set_dma_reserve(), global variable dma_reserve and the codes using it. Signed-off-by: Baoquan He Reviewed-by: Mike Rapoport (IBM) --- include/linux/mm.h | 1 - mm/mm_init.c | 23 ----------------------- 2 files changed, 24 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0436b919f1c7..ad19350e1538 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3210,7 +3210,6 @@ static inline int early_pfn_to_nid(unsigned long pfn) extern int __meminit early_pfn_to_nid(unsigned long pfn); #endif =20 -extern void set_dma_reserve(unsigned long new_dma_reserve); extern void mem_init(void); extern void __init mmap_init(void); =20 diff --git a/mm/mm_init.c b/mm/mm_init.c index 549e76af8f82..153fb2dc666f 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -226,7 +226,6 @@ static unsigned long required_movablecore_percent __ini= tdata; =20 static unsigned long nr_kernel_pages __initdata; static unsigned long nr_all_pages __initdata; -static unsigned long dma_reserve __initdata; =20 static bool deferred_struct_pages __meminitdata; =20 @@ -1583,12 +1582,6 @@ static void __init free_area_init_core(struct pglist= _data *pgdat) zone_names[j], memmap_pages, freesize); } =20 - /* Account for reserved pages */ - if (j =3D=3D 0 && freesize > dma_reserve) { - freesize -=3D dma_reserve; - pr_debug(" %s zone: %lu pages reserved\n", zone_names[0], dma_reserve); - } - if (!is_highmem_idx(j)) nr_kernel_pages +=3D freesize; /* Charge for highmem memmap if there are enough kernel pages */ @@ -2547,22 +2540,6 @@ void *__init alloc_large_system_hash(const char *tab= lename, return table; } =20 -/** - * set_dma_reserve - set the specified number of pages reserved in the fir= st zone - * @new_dma_reserve: The number of pages to mark reserved - * - * The per-cpu batchsize and zone watermarks are determined by managed_pag= es. - * In the DMA zone, a significant percentage may be consumed by kernel ima= ge - * and other unfreeable allocations which can skew the watermarks badly. T= his - * function may optionally be used to account for unfreeable pages in the - * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and - * smaller per-cpu batchsize. - */ -void __init set_dma_reserve(unsigned long new_dma_reserve) -{ - dma_reserve =3D new_dma_reserve; -} - void __init memblock_free_pages(struct page *page, unsigned long pfn, unsigned int order) { --=20 2.41.0