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    SubjectRe: [GIT PULL] kbuild changes for v4.9-rc1
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    On 12/18/2016, 03:54 PM, Nikolay Borisov wrote:
    >
    >
    > On 18.12.2016 16:45, Jiri Slaby wrote:
    >> Moreover, with some modules, __put_user_1 and others are reported
    >> instead of mcount.
    >
    >
    > nm vmlinux | grep __fentry__
    > nm vmlinux | grep mcount
    >
    > What do these report ? I bet you that in your vmlinux the first one
    > would return something like :
    >
    > ffffffff822f1810 T __fentry__
    > ffffffff827fdc20 r __kcrctab___fentry__
    > ffffffff82809461 r __kstrtab___fentry__
    > ffffffff827e6c20 R __ksymtab___fentry__
    > and nothing for the second. Whereas doing nm on the module in question
    > would give nothing for __fentry__ and something like: U mcount

    Well, I have just won a beer:
    $ nm vmlinux | grep mcount
    w __crc_mcount
    c0b3bd34 r __kcrctab_mcount
    c0b41692 r __kstrtab_mcount
    c0b2dd04 R __ksymtab_mcount
    c0896130 T mcount
    c0c9ee20 T __start_mcount_loc
    c0cba89c T __stop_mcount_loc
    $ nm vmlinux | grep __fentry__
    $ nm sound/soundcore.ko | grep mcount
    U mcount

    No, I am really not stupid. We compile the kernels like this for over a
    decade and it really broke with 4.9. Applying the patch fixes the
    problem. Reverting it, makes it recur.

    regards,
    --
    js
    suse labs

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