sorry for frequent emails, In my case, pgdp=c8000320, __nocache_fix(pgdp)=c0540320 __pa(pgdp) = 68000320 when I printed at the beging of srmmu_early_allocate_ptable_skeleton. Chan 보낸 사람 : "Chan Kim" <ckim@etri.re.kr> 보낸 날짜 : 2014-05-20 09:40:44 ( +09:00 ) 받는 사람 : Valdis.Kletnieks@vt.edu <Valdis.Kletnieks@vt.edu> 참조 : kernelnewbies@kernelnewbies.org <kernelnewbies@kernelnewbies.org> 제목 : Re: two virtual address pointing to same physical address Hi Valdis, I see. Thanks, I remember reading about the merits of virtual address in the books. But still it's confusing. Can two virtual addresses from the "same process" (in init process, one for nocache pool, the other not) point to the same physical address? I just want to make sure this is not a problem in my situtation. As I said earlier, in my case, during the init process, __nocache_fix(0xc8000000) is 0xc0540000. which is physically 0x60540000. Is this ok? could someone elaborate on this to me? Chan 보낸 사람 : "Valdis.Kletnieks@vt.edu" 보낸 날짜 : 2014-05-19 22:12:08 ( +09:00 ) 받는 사람 : 김찬 참조 : kernelnewbies@kernelnewbies.org 제목 : Re: two virtual address pointing to same physical address On Mon, 19 May 2014 11:47:23 -0000, Chan Kim said:
Is this situation normal? (in the kernel, two different virtual addresses pointing to the same physical address.)
Think for a bit how shared libraries are implemented. Then think about how mmap() of a shared region of a file at different virtual addresses in different processes works. Then you'll be able to answer your own question... _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies