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| author |   Nicholas Piggin <npiggin@gmail.com> | 2019-06-28 15:33:32 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-07-02 21:39:49 +1000 |
| commit | f30a5e68f026f3214a9392391537adaa79996b24 (patch) | |
| tree | aae2e59629903f03e463e905cf59b3c2eb510288 | |
| parent | powerpc/64s/exception: move SET_SCRATCH0 into EXCEPTION_PROLOG_0 (diff) | |
| download | linux-dev-f30a5e68f026f3214a9392391537adaa79996b24.tar.xz linux-dev-f30a5e68f026f3214a9392391537adaa79996b24.zip | |
powerpc/tm: update comment about interrupt re-entrancy
Since the system reset interrupt began to use its own stack, and
machine check interrupts have done so for some time, r1 can be
changed without clearing MSR[RI], provided no other interrupts
(including SLB misses) are taken.
MSR[RI] does have to be cleared when using SCRATCH0, however.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/kernel/tm.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S index 9fabdce255cd..6ba0fdd1e7f8 100644 --- a/arch/powerpc/kernel/tm.S +++ b/arch/powerpc/kernel/tm.S @@ -148,7 +148,7 @@ _GLOBAL(tm_reclaim) /* Stash the stack pointer away for use after reclaim */ std r1, PACAR1(r13) - /* Clear MSR RI since we are about to change r1, EE is already off. */ + /* Clear MSR RI since we are about to use SCRATCH0, EE is already off */ li r5, 0 mtmsrd r5, 1 @@ -474,7 +474,7 @@ restore_gprs: REST_GPR(7, r7) - /* Clear MSR RI since we are about to change r1. EE is already off */ + /* Clear MSR RI since we are about to use SCRATCH0. EE is already off */ li r5, 0 mtmsrd r5, 1 |