On Mon, Apr 25, 2016 at 10:06:25AM +0200, Martin Schwidefsky wrote: > On Fri, 22 Apr 2016 11:04:32 +0200 > Peter Zijlstra <pet...@infradead.org> wrote: > > > Implement FETCH-OP atomic primitives, these are very similar to the > > existing OP-RETURN primitives we already have, except they return the > > value of the atomic variable _before_ modification. > > > > This is especially useful for irreversible operations -- such as > > bitops (because it becomes impossible to reconstruct the state prior > > to modification). > > > > Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> > > --- > > arch/s390/include/asm/atomic.h | 42 > > +++++++++++++++++++++++++++++++---------- > > 1 file changed, 32 insertions(+), 10 deletions(-) > > That looks good, the code compiles and the functions are generated correctly. > We will know for sure if it works after the first user of these new functions > hit the kernel.
So we already have an atomic_fetch_or() user in the kernel, and this series adds an atomic_fetch_add_acquire() user. But yes, we'll undoubtedly grow more over time :-) > Acked-by: Martin Schwidefsky <schwidef...@de.ibm.com> Thanks!
