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    SubjectRe: [PATCH 1/5] sched: make struct task_struct::state 32-bit
    On Mon, Feb 08, 2021 at 05:30:25PM +0300, Alexey Dobriyan wrote:
    > On Mon, Feb 08, 2021 at 11:34:18AM +0100, Peter Zijlstra wrote:
    > > On Sat, Feb 06, 2021 at 06:18:32PM +0300, Alexey Dobriyan wrote:
    > >
    > > > Silently delete "extern" from prototypes.
    > >
    > > NAK, extern is right.
    >
    > Extern is only necessary for variables.

    Specifically C17, 6.2.2 p5 (linkage of identifiers):

    if the declaration of an identifier for a function has no
    storage-class specifier, its linkage is determined exactly as if
    it were declared with the storage-class specifier "extern".

    This is why nothing happens if "extern" is deleted.

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