Attachment 203812 Details for Bug 233863 – Investigatory sys/powerpc/powerpc/mp_machdep.c patch to avoid stuck-sleeping problem

[patch] Investigatory sys/powerpc/powerpc/mp_machdep.c patch to avoid stuck-sleeping problem

file_233863.txt (text/plain), 1.05 KB, created by Mark Millard on 2019-04-20 03:06:28 UTC

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Creator: Mark Millard

Created: 2019-04-20 03:06:28 UTC

Size: 1.05 KB

patch

obsolete

>Index: /usr/src/sys/powerpc/powerpc/mp_machdep.c
>===================================================================
>--- /usr/src/sys/powerpc/powerpc/mp_machdep.c   (revision 345758)
>+++ /usr/src/sys/powerpc/powerpc/mp_machdep.c   (working copy)
>@@ -77,9 +77,10 @@
>        PCPU_SET(awake, 1);
>        __asm __volatile("msync; isync");
> 
>+       powerpc_sync();
>        while (ap_letgo == 0)
>-               __asm __volatile("or 31,31,31");
>-       __asm __volatile("or 6,6,6");
>+               powerpc_sync();
>+       isync();
> 
>        /*
>         * Set timebase as soon as possible to meet an implicit rendezvous
>@@ -262,8 +263,11 @@
>        __asm __volatile("msync; isync");
>        
>        /* Let APs continue */
>-       atomic_store_rel_int(&ap_letgo, 1);
>+       ap_letgo= 1;    // depend on prior sync, no need to lwsync first
> 
>+       powerpc_sync(); // analogous to what the ap's do (more similar time frame?)
>+       if (ap_letgo) isync();
>+
>        platform_smp_timebase_sync(ap_timebase, 0);
> 
>        while (ap_awake < smp_cpus)

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