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[23.128.96.18]) by mx.google.com with ESMTP id x11si3562220pfq.70.2021.04.27.05.14.52; Tue, 27 Apr 2021 05:15:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@synopsys.com header.s=mail header.b=DEgE3TEr; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=synopsys.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235638AbhD0MO4 (ORCPT + 99 others); Tue, 27 Apr 2021 08:14:56 -0400 Received: from smtprelay-out1.synopsys.com ([149.117.87.133]:45520 "EHLO smtprelay-out1.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235410AbhD0MO4 (ORCPT ); Tue, 27 Apr 2021 08:14:56 -0400 Received: from mailhost.synopsys.com (mdc-mailhost1.synopsys.com [10.225.0.209]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by smtprelay-out1.synopsys.com (Postfix) with ESMTPS id BDFAEC0552; Tue, 27 Apr 2021 12:14:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=synopsys.com; s=mail; t=1619525653; bh=KRq0A/+QMHj5BLNmcw2miTkzyZiUHS4WDq7zHqV5LRg=; h=From:To:Cc:Subject:Date:From; b=DEgE3TErxy9aZN26Qcm5kU1BgX5NR3HwR+1aS4xNW9Uosf5lcpyVAFKbfRYJ9CnjY Vr2nwDhfnpnC51OzFJSDg6xTr8eAaQiNLqRgeMp8hpT51y/YX46GDT79LCokdPhokd VneN74QM5RrQdkRXk6pZdBMZsDbiNm7TYUsCslwSbGChjE5T0FIzPTVvA0Qz67MKmB 8ktP2a9wD+CkrB/LoUHrHvSS1XQqcS6HRk6KriAtHgLI12jUyJnLt3yfoxjoEkiE9w HnEe/FouDKZGFaG9EXVVaUENU9hhv9wezeoOm0PUei2VHs/BLqhsI2FOJeQcxVHg0p ABZcpiljJkX4A== Received: from ru20arcgnu1.internal.synopsys.com (ru20arcgnu1.internal.synopsys.com [10.121.9.48]) by mailhost.synopsys.com (Postfix) with ESMTP id 5B1C6A005C; Tue, 27 Apr 2021 12:14:07 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Vladimir Isaev To: linux-snps-arc@lists.infradead.org Cc: linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rppt@linux.ibm.com, Vladimir Isaev , Vineet Gupta Subject: [PATCH v2] ARC: Use max_high_pfn as a HIGHMEM zone border Date: Tue, 27 Apr 2021 15:13:54 +0300 Message-Id: <20210427121354.3620-1-isaev@synopsys.com> X-Mailer: git-send-email 2.16.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit 4af22ded0ecf ("arc: fix memory initialization for systems with two memory banks") fixed highmem, but for the PAE case it causes bug messages: BUG: Bad page state in process swapper pfn:80000 page:(ptrval) refcount:0 mapcount:1 mapping:00000000 index:0x0 pfn:0x80000 flags: 0x0() raw: 00000000 00000100 00000122 00000000 00000000 00000000 00000000 00000000 raw: 00000000 page dumped because: nonzero mapcount Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 5.12.0-rc5-00003-g1e43c377a79f #1 Stack Trace: arc_unwind_core+0xe8/0x118 Disabling lock debugging due to kernel taint This is because the fix expects highmem to be always less than lowmem and uses min_low_pfn as an upper zone border for highmem. max_high_pfn should be ok for both highmem and highmem+PAE cases. Signed-off-by: Vladimir Isaev Cc: Mike Rapoport Cc: Vineet Gupta --- Changes for v2: - Revised commit message and added comment to code --- arch/arc/mm/init.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index ce07e697916c..1bcc6985b9a0 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -157,7 +157,16 @@ void __init setup_arch_memory(void) min_high_pfn = PFN_DOWN(high_mem_start); max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz); - max_zone_pfn[ZONE_HIGHMEM] = min_low_pfn; + /* + * max_high_pfn should be ok here for both HIGHMEM and HIGHMEM+PAE. + * For HIGHMEM without PAE max_high_pfn should be less than + * min_low_pfn to guarantee that these two regions don't overlap. + * For PAE case highmem is greater than lowmem, so it is natural + * to use max_high_pfn. + * + * In both cases, holes should be handled by pfn_valid(). + */ + max_zone_pfn[ZONE_HIGHMEM] = max_high_pfn; high_memory = (void *)(min_high_pfn << PAGE_SHIFT); -- 2.16.2