[Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Ingo Molnar wrote:
> * Ingo Molnar <mingo@xxxxxxx> wrote:
>
>   
> > * Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> >     
> > > On Thu, 19 Jun 2008, Ingo Molnar wrote:
> > >       
> > > > Below is the commit, it needed a small amount of massaging to apply the 
> > > > void * -> unsigned long * change in the x86/bitops topic.
> > > >         
> > > Well, that's your bug right there.
> > >
> > > The macros very much depended on the pointers being "void *", due to 
> > > the pointer arithmetic (which is a gcc extension that we use 
> > > extensively - "void *" arithmetic works as if it was a byte 
> > > pointer).
> > >       
> > duh, yeah - of course. Will retry with that fixed :)
> >     
> yep, the patch below got it all going and it passed 5 hours of testing 
> already. Thanks,
>   
Blows up on "gcc version 3.4.4 20050314 (prerelease) (Debian 3.4.3-13)":

 CC      init/main.o
include2/asm/bitops.h: In function `start_kernel':
include2/asm/bitops.h:59: warning: asm operand 1 probably doesn't match 
constraints
include2/asm/bitops.h:59: warning: asm operand 1 probably doesn't match 
constraints
include2/asm/bitops.h:59: warning: asm operand 1 probably doesn't match 
constraints
include2/asm/bitops.h:59: error: impossible constraint in `asm'
include2/asm/bitops.h:59: error: impossible constraint in `asm'
include2/asm/bitops.h:59: error: impossible constraint in `asm'

        J



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