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    SubjectRe: [PATCH 08/46] kernel: MOve prototype declaration to header file include/linux/perf_event.h
    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?
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