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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id m20si2611411pgv.314.2019.06.21.07.58.11 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 21 Jun 2019 07:58:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=IciHtC1A; spf=pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=willy@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=3dT8GgJ6+uQhH34e10+L7yEjvR1H493y6W8QxwGRYS0=; b=IciHtC1ApoWbUNoHP8hTutDrf o6gvUQ24Xt0J/bDrghCwt4cTzS188eaW79VxqY0BfbMmSloZAPNz+SSJ7lJwC1At/wwBlNnZMzGvE JI3kRdeSfQRJnLw93aYTxtNxEc88pjz1eFuKSrVFWWA9dYgBW3S2QHuF89ixFNoxdmCFa9evNZ71l bLbOKkFnBVE60MYg64lKrVu1HfeUjrlQHjDW2nCQQY0aK/NepvOgeU05EzOnC3ZAMsFFqVOTx03B9 7rOmUhzubu7OkflA1YJR2Y2vXrp4aWmkmQskIwoNoAvTG4qZ/L9tz9pGkLltxg3c60n84ssoMa0Mi yBJMlDyDA==; Received: from willy by bombadil.infradead.org with local (Exim 4.92 #3 (Red Hat Linux)) id 1heKzO-0002EK-KP; Fri, 21 Jun 2019 14:58:06 +0000 Date: Fri, 21 Jun 2019 07:58:06 -0700 From: Matthew Wilcox To: Dan Williams Cc: akpm@linux-foundation.org, Michal Hocko , Oscar Salvador , David Hildenbrand , linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/sparsemem: Cleanup 'section number' data types Message-ID: <20190621145805.GN32656@bombadil.infradead.org> References: <156107543656.1329419.11505835211949439815.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <156107543656.1329419.11505835211949439815.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000081, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Jun 20, 2019 at 05:06:46PM -0700, Dan Williams wrote: > David points out that there is a mixture of 'int' and 'unsigned long' > usage for section number data types. Update the memory hotplug path to > use 'unsigned long' consistently for section numbers. ... because we're seriously considering the possibility that we'll need more than 4 billion sections?