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[84.3.50.134]) by smtp.gmail.com with ESMTPSA id s5sm4536747ejv.67.2020.08.06.14.20.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Aug 2020 14:20:21 -0700 (PDT) Date: Thu, 6 Aug 2020 23:20:19 +0200 From: Ingo Molnar To: Linus Torvalds Cc: Joerg Roedel , "Jason A. Donenfeld" , Linux Kernel Mailing List , Thomas Gleixner , Borislav Petkov , Peter Zijlstra , Andrew Morton Subject: Re: [GIT PULL] x86/mm changes for v5.9 Message-ID: <20200806212019.GA2149204@gmail.com> References: <20200803190354.GA1293087@gmail.com> <20200805110348.GA108872@zx2c4.com> <20200806131034.GA2067370@gmail.com> <20200806185723.GA24304@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Linus Torvalds wrote: > On Thu, Aug 6, 2020 at 11:57 AM Joerg Roedel wrote: > > > > On Thu, Aug 06, 2020 at 03:10:34PM +0200, Ingo Molnar wrote: > > > > > > * Linus Torvalds wrote: > > > > So apparently the "the page-table pages are all pre-allocated now" is > > > > simply not true. Joerg? > > > > It pre-allocates the whole vmalloc/ioremap PUD/P4D pages, but I actually > > only tested it with 4-level paging, as I don't have access to 5-level > > paging hardware. > > I don't think Jason has either. > > The > > PGD 0 P4D 0 > > line tells us that "pgd_present()" is true, even though PGD is 0 > (otherwise it wouldn't print the P4D part). That means that he doesn't > have l5 enabled. > > But you may obviously have different settings for CONFIG_X86_5LEVEL, > and maybe that ends up changing something? > > But since apparently it's not immediately obvious what the problem is, > I'll revert it for now. I've reverted it in x86/urgent as well earlier today, can send you that tree right now if you prefer that route. Thanks, Ingo