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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: Miles Chen <miles.chen@mediatek.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -135,6 +135,20 @@ equivalent to %lx (or %lu). %px is preferred because it is more uniquely
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grep'able. If in the future we need to modify the way the kernel handles
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printing pointers we will be better equipped to find the call sites.
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Pointer Differences
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-------------------
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::
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%td 2560
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%tx a00
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For printing the pointer differences, use the %t modifier for ptrdiff_t.
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Example::
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printk("test: difference between pointers: %td\n", ptr2 - ptr1);
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Struct Resources
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----------------
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