Messages in this thread | | | Date | Fri, 14 Oct 2022 10:10:39 +0200 | From | "Arnd Bergmann" <> | Subject | Re: [PATCH] of: Define of_match_ptr() with PTR_IF() to avoid unused variable warnings |
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On Thu, Oct 13, 2022, at 9:51 PM, Nathan Chancellor wrote: > > -#define of_match_ptr(_ptr) NULL > #define of_match_node(_matches, _node) NULL > #endif /* CONFIG_OF */ > > +#define of_match_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_OF), (_ptr)) > +
I think this is counterproductive, as it means we cannot use of_match_ptr() for its intended purpose any more, it will now cause a build failure for any driver that references a match table inside of an #ifdef.
Ideally we should be able to find the misuse of this macro with coccinelle and have it automatically generate patches that just remove it from drivers.
A first-level approximation would be this oneliner:
git grep -wl of_match_ptr | xargs git grep -wL CONFIG_OF | xargs sed -i "s:of_match_ptr(\([\ \#\>\"a-zA-Z0-9_-]*\)):\1:"
which takes care of 535 files that don't reference CONFIG_OF at all. There are 496 more files that use of_match_ptr() as well but also guard something inside of CONFIG_OF. Most of these are just incorrectly copy-pasted from older drivers and should not have an #ifdef in them to make the of_match_ptr() work, but they are not actually usable without CONFIG_OF.
Historically, we added the #ifdef at the time when we supported hundreds of boards without DT and only a couple of boards with DT, so having the extra #ifdef was a way of ensuring that the DT conversion would not add a few extra bytes of .data to each driver. Now we support thousands of boards with DT and only a few dozen without DT, so this is all pointless.
Arnd
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