This is a note to let you know that I've just added the patch titled powerpc/cell: Fix cell iommu after it_page_shift changes to the 4.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: powerpc-cell-fix-cell-iommu-after-it_page_shift-changes.patch and it can be found in the queue-4.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7261b956b276aa97fbf60d00f1d7717d2ea6ee78 Mon Sep 17 00:00:00 2001 From: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Date: Fri, 3 Apr 2015 14:11:54 +1100 Subject: powerpc/cell: Fix cell iommu after it_page_shift changes From: Michael Ellerman <mpe@xxxxxxxxxxxxxx> commit 7261b956b276aa97fbf60d00f1d7717d2ea6ee78 upstream. The patch to add it_page_shift incorrectly changed the increment of uaddr to use it_page_shift, rather then (1 << it_page_shift). This broke booting on at least some Cell blades, as the iommu was basically non-functional. Fixes: 3a553170d35d ("powerpc/iommu: Add it_page_shift field to determine iommu page size") Signed-off-by: Michael Ellerman <michael@xxxxxxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/powerpc/platforms/cell/iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/powerpc/platforms/cell/iommu.c +++ b/arch/powerpc/platforms/cell/iommu.c @@ -197,7 +197,7 @@ static int tce_build_cell(struct iommu_t io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset); - for (i = 0; i < npages; i++, uaddr += tbl->it_page_shift) + for (i = 0; i < npages; i++, uaddr += (1 << tbl->it_page_shift)) io_pte[i] = base_pte | (__pa(uaddr) & CBE_IOPTE_RPN_Mask); mb(); Patches currently in stable-queue which might be from mpe@xxxxxxxxxxxxxx are queue-4.0/powerpc-cell-fix-crash-in-iic_setup_cpu-after-per_cpu-changes.patch queue-4.0/powerpc-perf-cap-64bit-userspace-backtraces-to-perf_max_stack_depth.patch queue-4.0/powerpc-jump_label-include-linux-jump_label.h-to-get-have_jump_label-define.patch queue-4.0/powerpc-fix-missing-l2-cache-size-in-sys-devices-system-cpu.patch queue-4.0/powerpc-cell-fix-cell-iommu-after-it_page_shift-changes.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html