Commit 88288ed0 authored by Miles Chen's avatar Miles Chen Committed by Jonathan Corbet
Browse files

docs: printk-formats: add ptrdiff_t type to printk-formats 



When print the difference between two pointers, we should use
the ptrdiff_t modifier %t.

Signed-off-by: default avatarMiles Chen <miles.chen@mediatek.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent f0ae2cfa

Documentation/core-api/printk-formats.rst

+14 −0
Original line number Diff line number Diff line
@@ -135,6 +135,20 @@ equivalent to %lx (or %lu). %px is preferred because it is more uniquely 
grep'able. If in the future we need to modify the way the kernel handles

printing pointers we will be better equipped to find the call sites.



Pointer Differences

-------------------



::



	%td	2560

	%tx	a00



For printing the pointer differences, use the %t modifier for ptrdiff_t.



Example::



	printk("test: difference between pointers: %td\n", ptr2 - ptr1);



Struct Resources

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