>+#define __LS3A_WAR_LLSC " .set mips64r2\nsynci 0\n.set mips0\n"
>+#define __ls3a_war_llsc() __asm__ __volatile__("synci 0" : : :"memory”)
看起来这个只用于1000，所以我觉得名字应该是 __ls3x1k 或者类似的
俩下划线需要么？
> smp_llsc_mb in cmpxchg.h is enought
enought拼写错了
- __WEAK_LLSC_MB
"3: \n"
+ __WEAK_LLSC_MB
这里可能会影响其他CPU的性能？
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
这个应该要搞个CONFIG_啥啥啥 ？毕竟以后的芯片很可能没这问题了。
> 在 2019年1月12日，上午11:25，huangpei <huangpei@xxxxxxxxxxx> 写道：
>
> hi, this is the patch for ll/sc bug in Loongson3 based on Linux-4.20
> (8fe28cb58bcb235034b64cbbb7550a8a43fd88be)
>
> +. it cover all loongson3 CPU;
>
> +. to fix the ll/sc bug *sufficiently and exactly*, this patch shows
> how many places need to touch
>
> +. it is built ok for on Loongson3 and Cavium/Octeon, old version is
> tested in high pressure test
>
>
> On Fri, 11 Jan 2019 20:40:49 +0800 (GMT+08:00)
> 徐成华 <xuchenghua@xxxxxxxxxxx> wrote:
>
>> Hi Paul Burton,
>>
>> For Loongson 3A1000 and 3A3000, when a memory access instruction
>> (load, store, or prefetch)'s executing occurs between the execution
>> of LL and SC, the success or failure of SC is not predictable.
>> Although programmer would not insert memory access instructions
>> between LL and SC, the memory instructions before LL in
>> program-order, may dynamically executed between the execution of
>> LL/SC, so a memory fence(SYNC) is needed before LL/LLD to avoid this
>> situation.
>>
>> Since 3A3000, we improved our hardware design to handle this case.
>> But we later deduce a rarely circumstance that some speculatively
>> executed memory instructions due to branch misprediction between
>> LL/SC still fall into the above case, so a memory fence(SYNC) at
>> branch-target(if its target is not between LL/SC) is needed for
>> 3A1000 and 3A3000.
>>
>> Our processor is continually evolving and we aim to to remove all
>> these workaround-SYNCs around LL/SC for new-come processor.
>>
>> 北京市海淀区中关村环保科技示范园龙芯产业园2号楼 100095电话: +86 (10)
>> 62546668传真: +86 (10)
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> <0001-loongson64-add-helper-for-ll-sc-bugfix-in-loongson3.patch><0002-loongson64-fix-ll-sc-bug-of-loongson3-in-inline-asm.patch><0003-loongson64-fix-ll-sc-bug-of-Loongson-3-in-handle_tlb.patch>
