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    SubjectRe: linux-next: build warnings after merge of the tip tree
    On Mon, 21 Mar 2022 17:40:32 +0100
    Peter Zijlstra <peterz@infradead.org> wrote:

    > func_B:
    > call __fentry__ /* push func_B */
    > ...
    > call __fexit__ /* pop 1 + tails */
    > ret
    >
    > func_A:
    > call __fentry__ /* push func_A */
    > ...
    > call __ftail__ /* mark func_A tail */
    > jmp func_B
    >
    > func_C:
    > call __fentry__ /* push func_C */
    > call func_A;
    > ...
    > call __fexit__ /* pop 1 + tails */
    > ret;

    This also assumes that we need to trace everything that is marked. I
    mentioned in another email, what do we do if we only trace funcA?

    -- Steve

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