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References: <20201215144101.1878719-1-trix@redhat.com>
Subject: Re: [PATCH] drm/i915: remove h from printk format specifier
From:   Chris Wilson <chris@chris-wilson.co.uk>
Cc:     intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, Tom Rix <trix@redhat.com>
To:     airlied@linux.ie, daniel@ffwll.ch, daniele.ceraolospurio@intel.com,
        jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com,
        lionel.g.landwerlin@intel.com, rodrigo.vivi@intel.com,
        tejaskumarx.surendrakumar.upadhyay@intel.com, trix@redhat.com,
        tvrtko.ursulin@intel.com, venkata.s.dhanalakota@intel.com
Date:   Tue, 15 Dec 2020 18:13:10 +0000
Message-ID: <160805599050.14591.5854311082825914383@build.alporthouse.com>
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Quoting trix@redhat.com (2020-12-15 14:41:01)
> From: Tom Rix <trix@redhat.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