Re: [Xen-devel] [v3,11/41] mips: reuse asm-generic/barrier.h

[Leonid Yegoshin <Leonid.Yegoshin@xxxxxxxxxx>]

On 01/14/2016 02:24 PM, Paul E. McKenney wrote:
> Actually, the Linux kernel doesn't have an acquire barrier, just an 
> smp_load_acquire(). Or did someone sneak one in while I wasn't looking?
That was an exactly starting point for this discussion. This patch just 
pulls out from MIPS files smp_load_acquire() and smp_store_release(). 
However, I put into LMO half year ago the patch 
http://patchwork.linux-mips.org/patch/10506/ which replaces a generic 
smp_mb with MIPS specific smp_release/acquire in that functions. This 
patch also fixes use of SYNCs barriers in spin_locks/atomics/bitops for 
Imagination MIPS CPUs too - it is just absent now for any Imagination 
MIPS CPUs!
Michael later pointed me that it can be returned back with his series of 
patches but discussion was already here.
- Leonid.


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