linux-kernel - Re: [PATCH] drm/i915: remove h from printk format specifier

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Date:   Tue, 15 Dec 2020 18:13:10 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     airlied@...ux.ie, daniel@...ll.ch, daniele.ceraolospurio@...el.com,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        lionel.g.landwerlin@...el.com, rodrigo.vivi@...el.com,
        tejaskumarx.surendrakumar.upadhyay@...el.com, trix@...hat.com,
        tvrtko.ursulin@...el.com, venkata.s.dhanalakota@...el.com
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: Re: [PATCH] drm/i915: remove h from printk format specifier

Quoting trix@...hat.com (2020-12-15 14:41:01)
> From: Tom Rix <trix@...hat.com>
> 
> See Documentation/core-api/printk-formats.rst.
> h should no longer be used in the format specifier for printk.

It's understood by format_decode().
* 'h', 'l', or 'L' for integer fields

At least reference commit cbacb5ab0aa0 ("docs: printk-formats: Stop
encouraging use of unnecessary %h[xudi] and %hh[xudi]") as to why the
printk-formats.rst was altered so we know the code is merely in bad
taste and not using undefined behaviour of printk.
-Chris