| Message ID | 20191001100449.19481-1-miles.chen@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | docs: printk-formats: add ptrdiff_t type to printk-formats | expand |
On Tue, 1 Oct 2019 18:04:49 +0800 Miles Chen <miles.chen@mediatek.com> wrote: > When print the difference between two pointers, we should use > the ptrdiff_t modifier %t. > > Signed-off-by: Miles Chen <miles.chen@mediatek.com> > --- > Documentation/core-api/printk-formats.rst | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) Applied, thanks. jon
diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst index ecbebf4ca8e7..8a0f49cd158b 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -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 ----------------
When print the difference between two pointers, we should use the ptrdiff_t modifier %t. Signed-off-by: Miles Chen <miles.chen@mediatek.com> --- Documentation/core-api/printk-formats.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+)