From: Athira Rajeev atrajeev@linux.vnet.ibm.com
commit f5a9e488d62360c91c5770bd55a0b40e419a71ce upstream.
commit 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in C") reimplemented book3S code to pltform/powernv/idle.c. But when doing so missed to add the per-thread LDBAR update in the core_woken path of the power9_idle_stop(). Patch fixes the same.
Fixes: 10d91611f426 ("powerpc/64s: Reimplement book3s idle code in C") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Athira Rajeev atrajeev@linux.vnet.ibm.com Signed-off-by: Madhavan Srinivasan maddy@linux.vnet.ibm.com Reviewed-by: Nicholas Piggin npiggin@gmail.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20190702105836.26695-1-maddy@linux.vnet.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/platforms/powernv/idle.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/platforms/powernv/idle.c +++ b/arch/powerpc/platforms/powernv/idle.c @@ -758,7 +758,6 @@ static unsigned long power9_idle_stop(un mtspr(SPRN_PTCR, sprs.ptcr); mtspr(SPRN_RPR, sprs.rpr); mtspr(SPRN_TSCR, sprs.tscr); - mtspr(SPRN_LDBAR, sprs.ldbar);
if (pls >= pnv_first_tb_loss_level) { /* TB loss */ @@ -790,6 +789,7 @@ core_woken: mtspr(SPRN_MMCR0, sprs.mmcr0); mtspr(SPRN_MMCR1, sprs.mmcr1); mtspr(SPRN_MMCR2, sprs.mmcr2); + mtspr(SPRN_LDBAR, sprs.ldbar);
mtspr(SPRN_SPRG3, local_paca->sprg_vdso);