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    SubjectRe: [PATCH v1 0/4] Kill the time spent in patch_instruction()
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    Christophe Leroy <christophe.leroy@csgroup.eu> writes:
    > Le 15/05/2022 à 12:28, Michael Ellerman a écrit :
    >> On Tue, 22 Mar 2022 16:40:17 +0100, Christophe Leroy wrote:
    >>> This series reduces by 70% the time required to activate
    >>> ftrace on an 8xx with CONFIG_STRICT_KERNEL_RWX.
    >>>
    >>> Measure is performed in function ftrace_replace_code() using mftb()
    >>> around the loop.
    >>>
    >>> With the series,
    >>> - Without CONFIG_STRICT_KERNEL_RWX, 416000 TB ticks are measured.
    >>> - With CONFIG_STRICT_KERNEL_RWX, 546000 TB ticks are measured.
    >>>
    >>> [...]
    >>
    >> Patches 1, 3 and 4 applied to powerpc/next.
    >>
    >> [1/4] powerpc/code-patching: Don't call is_vmalloc_or_module_addr() without CONFIG_MODULES
    >> https://git.kernel.org/powerpc/c/cb3ac45214c03852430979a43180371a44b74596
    >> [3/4] powerpc/code-patching: Use jump_label for testing freed initmem
    >> https://git.kernel.org/powerpc/c/b033767848c4115e486b1a51946de3bee2ac0fa6
    >> [4/4] powerpc/code-patching: Use jump_label to check if poking_init() is done
    >> https://git.kernel.org/powerpc/c/1751289268ef959db68b0b6f798d904d6403309a
    >>
    >
    > Patch 2 was the keystone of this series. What happened to it ?

    It broke on 64-bit. I think I know why but I haven't had time to test
    it. Will try and get it fixed in the next day or two.

    cheers

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