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Clear any outstanding atomic reservations when traps are taken. This fixes

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some interesting bugs (mostly on SMP systems) with atomic operations
silently failing in interrupt heavy situations, especially when using
overflow pages.
This commit is contained in:
nwhitehorn 2011-06-23 16:34:41 +00:00
parent 594e41652d
commit 258f54d767
2 changed files with 4 additions and 0 deletions
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2
sys/powerpc/aim/trap_subr32.S
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@ -748,6 +748,8 @@ k_trap:
/* Call C interrupt dispatcher: */
trapagain:
addi %r3,%r1,8
addi %r4,%r1,-4 /* Clear any existing reservations */
stwcx. %r3,0,%r4
bl CNAME(powerpc_interrupt)
.globl CNAME(trapexit) /* backtrace code sentinel */
CNAME(trapexit):

2
sys/powerpc/aim/trap_subr64.S
View File

@ -508,6 +508,8 @@ trapagain:
lis %r3,tocbase@ha
ld %r2,tocbase@l(%r3)
addi %r3,%r1,48
addi %r4,%r1,-8 /* Clear any existing reservations */
stdcx. %r3,0,%r4
bl CNAME(powerpc_interrupt)
nop