====== Showing Real Kernel Addresses in 'dmesg' Output ======

In current kernel versions, if a pointer is to be printed in a message to the kernel log,
the commonly used format string ''%p'' prints only a hash of the pointer value.
This is for security reasons, but not very helpful for debugging.

If a real pointer value is to be printed, e.g. ''%px'' has to be used instead, e.g.

<code>
int i;
printk( KERN_INFO "Address of i: %px\n", &i );
</code>

There is quite a number of variations for the ''%p'' format specifier for different purposes, see e.g.:

  * **How to get printk format specifiers right**\\
    [[https://www.kernel.org/doc/html/v5.3/core-api/printk-formats.html]]

:!: The new format specifier ''%px'' was introduced around Linux kernel 4.15 and may not be supported by older kernels.

----

 --- //Martin Burnicki [[martin.burnicki@burnicki.net]], last updated 2022-01-19//