On Wed, Apr 14, 2021 at 03:32:04PM +, David Laight wrote:
> From: Segher Boessenkool
> > Sent: 14 April 2021 16:19
> ...
> > > Could the kernel use GCC builtin atomic functions instead ?
> > >
> > > https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
> >
> > Certainly that
From: Segher Boessenkool
> Sent: 14 April 2021 16:19
...
> > Could the kernel use GCC builtin atomic functions instead ?
> >
> > https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
>
> Certainly that should work fine for the simpler cases that the atomic
> operations are meant to
On Wed, Apr 14, 2021 at 02:42:51PM +0200, Christophe Leroy wrote:
> Le 14/04/2021 à 14:24, Segher Boessenkool a écrit :
> >On Wed, Apr 14, 2021 at 12:01:21PM +1000, Nicholas Piggin wrote:
> >>Would be nice if we could let the compiler deal with it all...
> >>
> >>static inline unsigned long
Le 14/04/2021 à 14:24, Segher Boessenkool a écrit :
On Wed, Apr 14, 2021 at 12:01:21PM +1000, Nicholas Piggin wrote:
Would be nice if we could let the compiler deal with it all...
static inline unsigned long lr(unsigned long *mem)
{
unsigned long val;
/*
* This
On Wed, Apr 14, 2021 at 12:01:21PM +1000, Nicholas Piggin wrote:
> Would be nice if we could let the compiler deal with it all...
>
> static inline unsigned long lr(unsigned long *mem)
> {
> unsigned long val;
>
> /*
> * This doesn't clobber memory but want to avoid
Excerpts from Segher Boessenkool's message of April 14, 2021 7:58 am:
> On Tue, Apr 13, 2021 at 06:33:19PM +0200, Christophe Leroy wrote:
>> Le 12/04/2021 à 23:54, Segher Boessenkool a écrit :
>> >On Thu, Apr 08, 2021 at 03:33:44PM +, Christophe Leroy wrote:
>> >>For clear bits, on 32 bits
On Tue, Apr 13, 2021 at 06:33:19PM +0200, Christophe Leroy wrote:
> Le 12/04/2021 à 23:54, Segher Boessenkool a écrit :
> >On Thu, Apr 08, 2021 at 03:33:44PM +, Christophe Leroy wrote:
> >>For clear bits, on 32 bits 'rlwinm' can be used instead or 'andc' for
> >>when all bits to be cleared are
Le 12/04/2021 à 23:54, Segher Boessenkool a écrit :
Hi!
On Thu, Apr 08, 2021 at 03:33:44PM +, Christophe Leroy wrote:
For clear bits, on 32 bits 'rlwinm' can be used instead or 'andc' for
when all bits to be cleared are consecutive.
Also on 64-bits, as long as both the top and bottom
Hi!
On Thu, Apr 08, 2021 at 03:33:44PM +, Christophe Leroy wrote:
> For clear bits, on 32 bits 'rlwinm' can be used instead or 'andc' for
> when all bits to be cleared are consecutive.
Also on 64-bits, as long as both the top and bottom bits are in the low
32-bit half (for 32 bit mode, it
