Messages in this thread | | | Date | Fri, 11 Feb 2022 14:05:23 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] container_of.h: make container_of const-aware |
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On Thu, 10 Feb 2022 20:04:34 +0300 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> wrote:
> container_of() macro has one major drawback. It does not check whether > the passed ptr has a const pointer, the result will always be a > non-const pointer. Use a _Generic() construct (supported since gcc 4.9 > and Clang 3.0) to teach container_of that if converting a const pointer, > the returned pointer should also have the const modifier. >
Nice idea, but my x86_64 allnoconfig build explodes with zillions of warnings.
In file included from ./include/linux/list.h:5, from ./include/linux/module.h:12, from init/do_mounts.c:2: ./include/net/sock.h: In function 'sk_entry': ./include/linux/container_of.h:17:42: warning: return discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
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