Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [patch 1/3] Text Edit Lock - i386 | Date | Tue, 19 Jun 2007 01:05:10 +0200 |
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On Tuesday 19 June 2007 00:52:25 Chuck Ebbert wrote: > On 06/18/2007 05:58 PM, Mathieu Desnoyers wrote: > > Interface to use for code patching : uses a mutex to insure mutual edit > > exclusion and makes sure the page is writable. > > > ... > > +/* Mutex protecting text section modification (dynamic code patching) */ > > +static DEFINE_MUTEX(text_mutex); > > + > > Probably should be a spinlock. > > And it just occurred to me, how does smp_alternatives deal with this? > Is it broken now when the text section is read-only?
The text section is only changed to ro very late, alternative code runs earlier.
But when you unplug all CPUs to go back to UP I suspect it may break.
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