Messages in this thread | | | Date | Thu, 27 Feb 2014 07:51:50 -0800 | From | Josh Triplett <> | Subject | Re: [PATCH 08/46] kernel: MOve prototype declaration to header file include/linux/perf_event.h |
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On Thu, Feb 27, 2014 at 12:54:14PM +0100, Peter Zijlstra wrote: > On Thu, Feb 27, 2014 at 05:02:48PM +0530, Rashika Kheria wrote: > > Add prototype declaration of function to header file > > include/linux/perf_event.h because it is used by more than one file. > > > > This eliminates the following warning in kernel/events/core.c: > > kernel/events/core.c:3743:13: warning: no previous prototype for ‘arch_perf_update_userpage’ [-Wmissing-prototypes] > > # git grep arch_perf_update_userpage > arch/x86/kernel/cpu/perf_event.c:void arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now) > kernel/events/core.c:void __weak arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now) > kernel/events/core.c: arch_perf_update_userpage(userpg, now); > > > There's two definitions; one weak, and one usage site. > > What gives?
There's no prototype for the function anywhere, so -Wmissing-prototypes rightfully complains. Adding the prototype to a header included in both source files ensures that the function signatures must match, and eliminates the warning.
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