Hi! this one is easy :) For printing pointer in kernel space, you should use %px not %p as format specifier. I heard this is for security reason(?). Chan Kim 내 Galaxy에서 보냄 -------- 원본 이메일 -------- 발신: wuzhouhui <wuzhouhui14@xxxxxxxxxxxxxxxx> 날짜: 21/8/19 오후 9:17 (GMT+09:00) 받은 사람: Lloyd <lloydkl.tech@xxxxxxxxx>, kernelnewbies@xxxxxxxxxxxxxxxxx 제목: Re: kmalloc - Address is not consecutive On 8/19/21 6:54 PM, Lloyd wrote: > Hi, > > I am trying to print the address of consecutive locations in a > memory allocated using kmalloc. It prints non contiguous addresses! I > tried with kmalloc_array, and normal array on stack, I got the same > result. May I know the reason? The code fragment for array and result > are given below. > > uint8_t MyArray[100]={'0'}; > printk(KERN_INFO "\nAddress is-> %p\n",&MyArray[0]); > printk(KERN_INFO "\nAddress is-> %p\n",&MyArray[1]); > printk(KERN_INFO "\nAddress is-> %p\n",&MyArray[2]); > > > [ 8684.613909] Address is-> 00000000b3330991 > [ 8684.613914] Address is-> 000000000519068c > [ 8684.613915] Address is-> 00000000e448ca76 > Quoted from Documentation/core-api/printk-formats.rst: > A raw pointer value may be printed with %p which will hash the address > before printing. The kernel also supports extended specifiers for printing > pointers of different types. So the address printed neither logical nor physical address. > Thanks a lot, > Lloyd > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies |
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