Re: [PATCH -v2 22/33] locking,sparc: Implement... | linux-arch

[PATCH -v2 00/33] implement atomic_fetch_$op · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 29/33] locking: Remove the deprecated atomic_{set,clear}_mask() functions · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 18/33] locking,parisc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 12/33] locking,ia64: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 06/33] locking,arm64: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() for LSE instructions · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 10/33] locking,h8300: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 13/33] locking,m32r: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 02/33] locking,arc: Implement atomic_fetch_{add,sub,and,andnot,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 27/33] locking: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 32/33] locking,qrwlock: Employ atomic_fetch_add_acquire() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 24/33] locking,x86: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 33/33] locking,rwsem: Employ atomic_long_fetch_add() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 31/33] locking,mips: Convert to _relaxed atomics · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 15/33] locking,metag: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 21/33] locking,sh: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 01/33] locking,alpha: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 05/33] arm64: atomic: generate LSE non-return cases using common macros · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 07/33] locking,avr32: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 28/33] locking: Remove linux/atomic.h:atomic_fetch_or · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 25/33] locking,xtensa: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 22/33] locking,sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
Re: [PATCH -v2 22/33] locking,sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · David Miller <davem@davemloft.net> · 2016-05-31
[PATCH -v2 09/33] locking,frv: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 26/33] locking: Fix atomic64_relaxed bits · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 23/33] locking,tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 16/33] locking,mips: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
Re: [PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}() · Geert Uytterhoeven <geert@linux-m68k.org> · 2016-06-16
Re: [PATCH -v2 14/33] locking,m68k: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-06-16
[PATCH -v2 11/33] locking,hexagon: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 17/33] locking,mn10300: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 20/33] locking,s390: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 03/33] locking,arm: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 04/33] locking,arm64: Implement atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 19/33] locking,powerpc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,_release}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
Re: [PATCH -v2 19/33] locking,powerpc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,_release}() · Boqun Feng <hidden> · 2016-06-01
Re: [PATCH -v2 19/33] locking,powerpc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,_release}() · Boqun Feng <hidden> · 2016-06-01
Re: [PATCH -v2 19/33] locking,powerpc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}{,_relaxed,_acquire,_release}() · Peter Zijlstra <peterz@infradead.org> · 2016-06-01
[PATCH -v2 08/33] locking,blackfin: Implement atomic_fetch_{add,sub,and,or,xor}() · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
[PATCH -v2 30/33] locking,alpha: Convert to _relaxed atomics · Peter Zijlstra <peterz@infradead.org> · 2016-05-31
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Will Deacon <hidden> · 2016-06-01
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Vineet Gupta <hidden> · 2016-06-02
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Peter Zijlstra <peterz@infradead.org> · 2016-06-02
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Peter Zijlstra <peterz@infradead.org> · 2016-06-08
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Ingo Molnar <mingo@kernel.org> · 2016-06-08
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Peter Zijlstra <peterz@infradead.org> · 2016-06-08
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Vineet Gupta <hidden> · 2016-06-08
Re: [PATCH -v2 00/33] implement atomic_fetch_$op · Peter Zijlstra <peterz@infradead.org> · 2016-06-08

Re: [PATCH -v2 22/33] locking,sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()

From: David Miller <davem@davemloft.net>
Date: 2016-05-31 17:51:02
Also in: lkml

From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 31 May 2016 12:19:47 +0200

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) <peterz@infradead.org>

Acked-by: David S. Miller <davem@davemloft.net>

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