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    SubjectRe: remove the last set_fs() in common code, and remove it for x86 and powerpc v2
    On Tue, Sep 01, 2020 at 07:13:00PM +0200, Christophe Leroy wrote:

    > 10.92% dd [kernel.kallsyms] [k] iov_iter_zero

    Interesting... Could you get an instruction-level profile inside iov_iter_zero(),
    along with the disassembly of that sucker?

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