Thanks a lot, it worked :) On Thu, Aug 19, 2021 at 7:00 PM ckim <ckim@etri.re.kr> wrote:

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@mails.ucas.ac.cn> 날짜: 21/8/19 오후 9:17 (GMT+09:00) 받은 사람: Lloyd <lloydkl.tech@gmail.com>, kernelnewbies@kernelnewbies.org 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

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