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docs: networking: timestamping: improve stacked PHC sentence

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The first paragraph makes no grammatical sense. I suppose a portion of
the intended sentece is missing: "[The challenge with ] stacked PHCs
(...) is that they uncover bugs".

Rephrase, and at the same time simplify the structure of the sentence a
little bit, it is not easy to follow.

Fixes: 94d9f78f4d ("docs: networking: timestamping: add section for stacked PHC devices")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://patch.msgid.link/20250512131751.320283-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean
2025-05-12 16:17:51 +03:00
committed by Jakub Kicinski
parent 588431474e
commit d5c17e3654
1 changed files with 3 additions and 5 deletions
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8
Documentation/networking/timestamping.rst
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@@ -811,11 +811,9 @@ Documentation/devicetree/bindings/ptp/timestamper.txt for more details.
3.2.4 Other caveats for MAC drivers
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Stacked PHCs, especially DSA (but not only) - since that doesn't require any
modification to MAC drivers, so it is more difficult to ensure correctness of
all possible code paths - is that they uncover bugs which were impossible to
trigger before the existence of stacked PTP clocks. One example has to do with
this line of code, already presented earlier::
The use of stacked PHCs may uncover MAC driver bugs which were impossible to
trigger without them. One example has to do with this line of code, already
presented earlier::
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;