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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id e13-v6sm7593380wrm.45.2018.06.21.08.01.13 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 21 Jun 2018 08:01:13 -0700 (PDT) Date: Thu, 21 Jun 2018 17:01:11 +0200 From: Ingo Molnar To: Baoquan He Cc: linux-kernel@vger.kernel.org, lcapitulino@redhat.com, keescook@chromium.org, tglx@linutronix.de, x86@kernel.org, hpa@zytor.com, fanc.fnst@cn.fujitsu.com, yasu.isimatu@gmail.com, indou.takao@jp.fujitsu.com, douly.fnst@cn.fujitsu.com Subject: Re: [PATCH 1/2] x86/boot/KASLR: Add two functions for 1GB huge pages handling Message-ID: <20180621150111.GA23607@gmail.com> References: <20180516100532.14083-1-bhe@redhat.com> <20180516100532.14083-2-bhe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180516100532.14083-2-bhe@redhat.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Baoquan He wrote: > +/* Store the number of 1GB huge pages which user specified.*/ > +static unsigned long max_gb_huge_pages; > + > +static int parse_gb_huge_pages(char *param, char* val) > +{ > + char *p; > + u64 mem_size; > + static bool gbpage_sz = false; > + > + if (!strcmp(param, "hugepagesz")) { > + p = val; > + mem_size = memparse(p, &p); > + if (mem_size == PUD_SIZE) { > + if (gbpage_sz) > + warn("Repeadly set hugeTLB page size of 1G!\n"); > + gbpage_sz = true; > + } else > + gbpage_sz = false; > + } else if (!strcmp(param, "hugepages") && gbpage_sz) { > + p = val; > + max_gb_huge_pages = simple_strtoull(p, &p, 0); > + debug_putaddr(max_gb_huge_pages); > + } > +} This function has at least one style problem and one typo. Also, we don't put statics in the middle of function variable blocks. > +/* Skip as many 1GB huge pages as possible in the passed region. */ > +static void process_gb_huge_page(struct mem_vector *region, unsigned long image_size) > +{ > + int i = 0; > + unsigned long addr, size; > + struct mem_vector tmp; > + > + if (!max_gb_huge_pages) { > + store_slot_info(region, image_size); > + return; > + } > + > + addr = ALIGN(region->start, PUD_SIZE); > + /* If Did we raise the address above the passed in memory entry? */ > + if (addr < region->start + region->size) > + size = region->size - (addr - region->start); > + > + /* Check how many 1GB huge pages can be filtered out*/ > + while (size > PUD_SIZE && max_gb_huge_pages) { > + size -= PUD_SIZE; > + max_gb_huge_pages--; > + i++; > + } > + > + if (!i) { > + store_slot_info(region, image_size); > + return; > + } > + > + /* Process the remaining regions after filtering out. */ > + > + if (addr >= region->start + image_size) { > + tmp.start = region->start; > + tmp.size = addr - region->start; > + store_slot_info(&tmp, image_size); > + } > + > + size = region->size - (addr - region->start) - i * PUD_SIZE; > + if (size >= image_size) { > + tmp.start = addr + i*PUD_SIZE; > + tmp.size = size; > + store_slot_info(&tmp, image_size); > + } > +} I counted about 5 style problems and at least one typo in this function ... Please review the code you are submitting more carefully for small details as well. Thanks, Ingo