On Tue, Sep 10, 2013 at 6:44 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>> I tried with 2.6.3 from crosstool, and it succeeded, too.
>>
> Do such old versions of gcc still exist ? Just kidding :)
>
>> Turns out cfs_access_process_vm() is called with write=0 only.
>> Gcc 2.6.3 optimizes away the write != 0 branch (which calls copy_to_user_page()
>> and thus flush_icache_user_range()), while gcc 4.1.2 doesn't do that.
>> Mystery solved.
>>
> Still bad. Guess it would still fail with 4.6.3 if optimization is turned off.
For the record: s/2.6.3/4.6.3/.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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