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Date: Thu, 11 Apr 2013 10:58:44 +0800 From: Simon Jeons <simon.jeons@...il.com> To: "H. Peter Anvin" <hpa@...or.com> CC: Frantisek Hrbata <fhrbata@...hat.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, tglx@...utronix.de, mingo@...hat.com, x86@...nel.org, oleg@...hat.com, kamaleshb@...ibm.com Subject: Re: [PATCH] x86: add phys addr validity check for /dev/mem mmap Hi H.Peter, On 04/11/2013 10:48 AM, H. Peter Anvin wrote: > On 04/10/2013 07:40 PM, Simon Jeons wrote: >> Hi H.Peter, >> On 04/04/2013 09:13 AM, H. Peter Anvin wrote: >>> On 04/03/2013 06:11 PM, Simon Jeons wrote: >>>> Why we consider boot_cpu_data.x86_phys_bits instead of e820 map here? >>>> >>> Because x86_phys_bits is what controls how much address space the >>> processor has. e820 tells us how much *RAM* the machine has, or >>> specifically, how much RAM the machine had on boot. >> I have 8GB memory in my machine, but when I accumulated every e820 >> ranges which dump in dmesg, there are 25MB memory less then 8GB(1024*8) >> memory, why 25MB miss? >> > For whatever reason your BIOS is stealing some memory, possibly for video. Thanks for your quick response. ;-) My machine is new which have i7 cpu. How much memory video need? 8MB? Why I miss 25MB? > > -hpa > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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