On 19 Jun 01 at 13:21, Richard B. Johnson wrote:
> On Tue, 19 Jun 2001, Timur Tabi wrote:
> > Oh, I see the problem. You could do something like this:
> >
> > cli
> > mov %0, %%eax
> > inc %%eax
> > mov %%eax, %0
> > sti
> >
> > and then return eax, but that won't work on SMP (whereas the "lock
On Tue, 19 Jun 2001, Timur Tabi wrote:
> ** Reply to message from "Petr Vandrovec" <[EMAIL PROTECTED]> on Tue, 19 Jun
> 2001 01:36:26 MET-1
>
>
> > No. Another CPU might increment value between LOCK INCL and
> > fetching v->counter. On ia32 architecture you are almost out of
> > luck. You can e
** Reply to message from "Petr Vandrovec" <[EMAIL PROTECTED]> on Tue, 19 Jun
2001 01:36:26 MET-1
> No. Another CPU might increment value between LOCK INCL and
> fetching v->counter. On ia32 architecture you are almost out of
> luck. You can either try building atomic_inc around CMPXCHG,
> using
> I need a simple (??) change to atomic_inc() functionality. so that i can
> increment and return the value of the variable.
Please don't blindly change atomic.h to do this. A large number of processors
don't have the x86 'xadd' functionality. Create/use seperate functions instead
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On Tue, Jun 19, 2001 at 01:18:41AM +0200, Erik Mouw wrote:
> I also don't know the exact meaning, but here are two nice tutorials
> about inline assembly:
>
> http://www-106.ibm.com/developerworks/linux/library/l-ia.html
> http://www.uwsg.indiana.edu/hypermail/linux/kernel/9804.2/0953.html
this
The C-names-in-asms stuff is explained in (g?)as.info. The explanation is
a bit strained, but after the third or fourth read it becomes fairly
sensible.
Rick Hohensee
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On 18 Jun 01 at 18:20, Timur Tabi wrote:
> You want to return the variable? Try this:
>
> static __inline__ unsigned long atomic_inc(atomic_t *v)
> {
> __asm__ __volatile__(
> LOCK "incl %0"
> :"=m" (v->counter)
> :"m" (v->counter));
>
> return v->counter;
> }
N
** Reply to message from "Raj, Ashok" <[EMAIL PROTECTED]> on Mon, 18 Jun 2001
15:56:50 -0700
> also if there is any reference to the gnu asm symtax, please send me a
> pointer..
There's lots
> i can understand what the LOCK "incl %0 means.. but not sure what the rest
> is for.
LOCK just mean
On Mon, Jun 18, 2001 at 03:56:50PM -0700, Raj, Ashok wrote:
> i can understand what the LOCK "incl %0 means.. but not sure what the rest
> is for.
>
> thanks
> ashokr
>
> static __inline__ void atomic_inc(atomic_t *v)
> {
> __asm__ __volatile__(
> LOCK "incl %0"
> :"=m" (v->c
Hello asm gurus..
I need a simple (??) change to atomic_inc() functionality. so that i can
increment and return the
value of the variable.
current implementation in linux/include/asm/atomic.h does not do this job.
any help would be greatly appreciated.
ashokr
from atomic.h
also if there is
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