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Groups > linux.kernel > #1384908
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC][PATCH 00/31] implement atomic_fetch_$op |
| Date | 2016-04-22 12:10 +0200 |
| Message-ID | <rqFSN-8hs-3@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
As there have been a few requests for atomic_fetch_$op primitives and recently by Linus, I figured I'd go and implement the lot. The atomic_fetch_$op differs from the existing atomic_$op_return we already have by returning the old value instead of the new value. This is especially useful when the operation is irreversible (like bitops), and allows for things like test-and-set. I did these patches on the plane, without access to architecture documentation, so mistakes are quite possible. However, I mostly started with the atomic_$op_return implementation and modified those to return the old value, which significantly decreases the creativity required. The one that I did not do was ARMv8.1-LSE and I was hoping Will would help out with that. Also, it looks like the 0-day built bot does not do arm64 builds, people might want to look into that. No known build breakage on the build-bot, boot tested on x86_64. Notes: - tile might have a barrier issue - there are a few more archs that can be converted to _relaxed if they so care: arc metag tile --- arch/alpha/include/asm/atomic.h | 89 ++++- arch/arc/include/asm/atomic.h | 67 +++- arch/arm/include/asm/atomic.h | 106 +++++- arch/arm64/include/asm/atomic.h | 30 ++ arch/arm64/include/asm/atomic_ll_sc.h | 108 ++++-- arch/avr32/include/asm/atomic.h | 54 ++- arch/blackfin/include/asm/atomic.h | 8 + arch/blackfin/kernel/bfin_ksyms.c | 1 + arch/blackfin/mach-bf561/atomic.S | 43 ++- arch/frv/include/asm/atomic.h | 30 +- arch/frv/include/asm/atomic_defs.h | 2 + arch/h8300/include/asm/atomic.h | 29 +- arch/hexagon/include/asm/atomic.h | 31 +- arch/ia64/include/asm/atomic.h | 130 ++++++- arch/m32r/include/asm/atomic.h | 36 +- arch/m68k/include/asm/atomic.h | 51 ++- arch/metag/include/asm/atomic_lnkget.h | 36 +- arch/metag/include/asm/atomic_lock1.h | 33 +- arch/mips/include/asm/atomic.h | 154 +++++++- arch/mn10300/include/asm/atomic.h | 33 +- arch/parisc/include/asm/atomic.h | 63 +++- arch/powerpc/include/asm/atomic.h | 83 ++++- arch/s390/include/asm/atomic.h | 40 ++- arch/sh/include/asm/atomic-grb.h | 34 +- arch/sh/include/asm/atomic-irq.h | 31 +- arch/sh/include/asm/atomic-llsc.h | 32 +- arch/sparc/include/asm/atomic_32.h | 13 +- arch/sparc/include/asm/atomic_64.h | 16 +- arch/sparc/lib/atomic32.c | 29 +- arch/sparc/lib/atomic_64.S | 61 +++- arch/sparc/lib/ksyms.c | 17 +- arch/tile/include/asm/atomic.h | 2 + arch/tile/include/asm/atomic_32.h | 60 +++- arch/tile/include/asm/atomic_64.h | 117 ++++-- arch/tile/include/asm/bitops_32.h | 18 +- arch/tile/lib/atomic_32.c | 42 +-- arch/tile/lib/atomic_asm_32.S | 14 +- arch/x86/include/asm/atomic.h | 35 +- arch/x86/include/asm/atomic64_32.h | 25 +- arch/x86/include/asm/atomic64_64.h | 35 +- arch/xtensa/include/asm/atomic.h | 52 ++- include/asm-generic/atomic-long.h | 36 +- include/asm-generic/atomic.h | 47 +++ include/asm-generic/atomic64.h | 15 +- include/linux/atomic.h | 627 ++++++++++++++++++++++++--------- kernel/locking/qrwlock.c | 2 +- kernel/locking/qspinlock_paravirt.h | 4 +- kernel/time/tick-sched.c | 4 +- lib/atomic64.c | 32 +- lib/atomic64_test.c | 34 ++ 50 files changed, 2181 insertions(+), 510 deletions(-)
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[RFC][PATCH 00/31] implement atomic_fetch_$op Peter Zijlstra <peterz@infradead.org> - 2016-04-22 12:10 +0200
[RFC][PATCH 10/31] locking,hexagon: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-04-22 12:10 +0200
Re: [RFC][PATCH 10/31] locking,hexagon: Implement atomic_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-04-23 04:20 +0200
Re: [RFC][PATCH 10/31] locking,hexagon: Implement atomic_fetch_{add,sub,and,or,xor}() Richard Kuo <rkuo@codeaurora.org> - 2016-04-26 02:40 +0200
[RFC][PATCH 22/31] locking,tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-04-22 12:10 +0200
Re: [RFC][PATCH 22/31] locking,tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() Peter Zijlstra <peterz@infradead.org> - 2016-04-26 17:30 +0200
[RFC][PATCH 31/31] locking,qrwlock: Employ atomic_fetch_add_acquire() Peter Zijlstra <peterz@infradead.org> - 2016-04-22 12:10 +0200
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