Thanks a lot, it worked :)
On Thu, Aug 19, 2021 at 7:00 PM ckim <ckim@xxxxxxxxxx> 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 Kim내 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@xxxxxxxxxxxxxxxxx제목: 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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