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| author | Gautham R. Shenoy <ego@linux.vnet.ibm.com> | 2017-02-27 06:40:07 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-03 01:24:50 +0100 |
| commit | 424f8acd328a111319ae30bf384e5dfb9bc8f8cb (patch) | |
| tree | 348d5c63218de5501791d521fd5df93ce7a7cf59 /arch/powerpc/include/asm/cpuidle.h | |
| parent | powerpc/64: Invalidate process table caching after setting process table (diff) | |
| download | linux-424f8acd328a111319ae30bf384e5dfb9bc8f8cb.tar.xz linux-424f8acd328a111319ae30bf384e5dfb9bc8f8cb.zip | |
powerpc/powernv: Fix bug due to labeling ambiguity in power_enter_stop
Commit 09206b600c76 ("powernv: Pass PSSCR value and mask to
power9_idle_stop") added additional code in power_enter_stop() to
distinguish between stop requests whose PSSCR had ESL=EC=1 from those
which did not. When ESL=EC=1, we do a forward-jump to a location
labelled by "1", which had the code to handle the ESL=EC=1 case.
Unfortunately just a couple of instructions before this label, is the
macro IDLE_STATE_ENTER_SEQ() which also has a label "1" in its
expansion.
As a result, the current code can result in directly executing stop
instruction for deep stop requests with PSSCR ESL=EC=1, without saving
the hypervisor state.
Fix this BUG by labeling the location that handles ESL=EC=1 case with
a more descriptive label ".Lhandle_esl_ec_set" (local label suggestion
a la .Lxx from Anton Blanchard).
While at it, rename the label "2" labelling the location of the code
handling entry into deep stop states with ".Lhandle_deep_stop".
For a good measure, change the label in IDLE_STATE_ENTER_SEQ() macro
to an not-so commonly used value in order to avoid similar mishaps in
the future.
Fixes: 09206b600c76 ("powernv: Pass PSSCR value and mask to power9_idle_stop")
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/cpuidle.h')
| -rw-r--r-- | arch/powerpc/include/asm/cpuidle.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/cpuidle.h b/arch/powerpc/include/asm/cpuidle.h index fd321eb423cb..155731557c9b 100644 --- a/arch/powerpc/include/asm/cpuidle.h +++ b/arch/powerpc/include/asm/cpuidle.h @@ -70,8 +70,8 @@ static inline void report_invalid_psscr_val(u64 psscr_val, int err) std r0,0(r1); \ ptesync; \ ld r0,0(r1); \ -1: cmpd cr0,r0,r0; \ - bne 1b; \ +236: cmpd cr0,r0,r0; \ + bne 236b; \ IDLE_INST; \ #define IDLE_STATE_ENTER_SEQ_NORET(IDLE_INST) \ |