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Fri, 17 Jul 2020 09:21:40 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 1ACE0304D58; Fri, 17 Jul 2020 11:21:39 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 0BB8629CF6F4E; Fri, 17 Jul 2020 11:21:39 +0200 (CEST) Date: Fri, 17 Jul 2020 11:21:39 +0200 From: Peter Zijlstra To: ira.weiny@intel.com Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , x86@kernel.org, Dave Hansen , Dan Williams , Vishal Verma , Andrew Morton , Fenghua Yu , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH RFC V2 13/17] kmap: Add stray write protection for device pages Message-ID: <20200717092139.GC10769@hirez.programming.kicks-ass.net> References: <20200717072056.73134-1-ira.weiny@intel.com> <20200717072056.73134-14-ira.weiny@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200717072056.73134-14-ira.weiny@intel.com> X-Rspamd-Queue-Id: 714B9183DC8E3 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jul 17, 2020 at 12:20:52AM -0700, ira.weiny@intel.com wrote: > @@ -31,6 +32,20 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size) > > #include > > +static inline void enable_access(struct page *page) > +{ > + if (!page_is_access_protected(page)) > + return; > + dev_access_enable(); > +} > + > +static inline void disable_access(struct page *page) > +{ > + if (!page_is_access_protected(page)) > + return; > + dev_access_disable(); > +} These are some very generic names, do we want them to be a little more specific?