Messages in this thread | | | From | Linus Torvalds <> | Date | Tue, 25 May 2021 10:23:39 -1000 | Subject | Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads |
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On Tue, May 25, 2021 at 9:40 AM Olivier Langlois <olivier@trillion01.com> wrote: > > If I look in the create_io_thread() function, I can see that CLONE_VM > isn't set...
That would indeed be horribly buggy, but I'm not seeing it:
.flags = ((lower_32_bits(flags) | CLONE_VM | CLONE_UNTRACED) & ~CSIGNAL),
Yeah, it has that odd "first create 'flags' without the CLONE_VM, but that is only used for that
lower_32_bits(flags)
thing, and then we explicitly add CLONE_VM in there in the actual kernel_clone_args.
It's because of how 'kernel_thread()' is written (that has historical reasons), and the oddity is copied from there.
Linus
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