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    SubjectRe: [PATCH v3 18/39] x86/ibt,ftrace: Make function-graph play nice
    On Fri, Mar 04, 2022 at 09:51:54AM -0800, Josh Poimboeuf wrote:
    > On Thu, Mar 03, 2022 at 12:23:39PM +0100, Peter Zijlstra wrote:
    > > +
    > > + addq $16, %rsp
    > > + ANNOTATE_INTRA_FUNCTION_CALL
    > > + call .Ldo_rop
    > > + int3
    > > +.Ldo_rop:
    > > + mov %rdi, (%rsp)
    > > + UNWIND_HINT_FUNC
    > > + RET
    >
    > Why the int3?

    Speculation trap :-) Either I'm too paranoid or not paranoid enough; but
    without it it's just too close to a retpoline and it doesn't feel right.

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