Author: David S. Miller <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 26 18:48:16 2007 -0800
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Fri Jan 26 18:56:01 2007 -0800
[SPARC64]: Set g4/g5 properly in sun4v dtlb-prot handling.
Mirror the logic in the sun4u handler, we have to update
both registers even when we branch out to window fault
The way it works is that if we are in etrap processing a
fault already, g4/g5 holds the original fault information.
If we take a window spill fault while doing etrap, then
we put the window spill fault info into g4/g5 and this is
what the top-level fault handler ends up processing first.
Then we retry the originally faulting instruction, and
process the original fault at that time.
This is all necessary because of how constrained the trap
registers are in these code paths. These cases trigger
very rarely, so even if there is some performance implication
it's doesn't happen very often. In fact the rarity is why
it took so long to trigger and find this particular bug.
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
arch/sparc64/kernel/sun4v_tlb_miss.S | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/sparc64/kernel/sun4v_tlb_miss.S
index b731881..9871dbb 100644
@@ -142,9 +142,9 @@ sun4v_dtlb_prot:
rdpr %tl, %g1
cmp %g1, 1
bgu,pn %xcc, winfix_trampoline
- ba,pt %xcc, sparc64_realfault_common
mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
+ ba,pt %xcc, sparc64_realfault_common
/* Called from trap table:
* %g4: vaddr
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