powerpc: make iSeries boot again

On ARCH=ppc64 we were getting htab_hash_mask recalculated
to the correct value for our particular machine by accident.
In the merge tree, that code was commented out, so htab_hash_mask
was being corrupted.

We now set ppc64_pft_size instead which gets htab_has_mask
calculated correctly for us later.  We should put an
ibm,pft-size property in the device tree at some point.

Also set -mno-minimal-toc in some makefiles.
Allow iSeries to configure PROC_DEVICETREE.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

4 files changed, 8 insertions, 6 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 330376b74c87..cd55c9b0f7ea 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -570,7 +570,7 @@ config SCHED_SMT
 
 config PROC_DEVICETREE
         bool "Support for Open Firmware device tree in /proc"
-        depends on PPC_OF && PROC_FS
+        depends on (PPC_OF || PPC_ISERIES) && PROC_FS
         help
           This option adds a device-tree directory under /proc which contains
           an image of the device tree that the kernel copies from Open
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index 612bc4ec72b1..14b2ffb6c2d8 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -2,6 +2,10 @@
 # Makefile for the linux ppc-specific parts of the memory manager.
 #
 
+ifeq ($(CONFIG_PPC64),y)
+EXTRA_CFLAGS    += -mno-minimal-toc
+endif
+
 obj-y                           := fault.o mem.o lmb.o
 obj-$(CONFIG_PPC32)             += init_32.o pgtable_32.o mmu_context_32.o \
                                    tlb_32.o
diff --git a/arch/powerpc/platforms/iseries/Makefile b/arch/powerpc/platforms/iseries/Makefile
index 18bf40077561..127b465308be 100644
--- a/arch/powerpc/platforms/iseries/Makefile
+++ b/arch/powerpc/platforms/iseries/Makefile
@@ -1,3 +1,5 @@
+EXTRA_CFLAGS    += -mno-minimal-toc
+
 obj-y += hvlog.o hvlpconfig.o lpardata.o setup.o mf.o lpevents.o \
         hvcall.o proc.o htab.o iommu.o misc.o
 obj-$(CONFIG_PCI) += pci.o irq.o vpdinfo.o
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index c3e532b766ef..b6cf050a8c27 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -430,7 +430,6 @@ static void __init build_iSeries_Memory_Map(void)
         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
         u32 nextPhysChunk;
         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
-        u32 num_ptegs;
         u32 totalChunks,moreChunks;
         u32 currChunk, thisChunk, absChunk;
         u32 currDword;
@@ -493,10 +492,7 @@ static void __init build_iSeries_Memory_Map(void)
         printk("HPT absolute addr = %016lx, size = %dK\n",
                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 
-        /* Fill in the hashed page table hash mask */
-        num_ptegs = hptSizePages *
-                (PAGE_SIZE / (sizeof(hpte_t) * HPTES_PER_GROUP));
-        htab_hash_mask = num_ptegs - 1;
+        ppc64_pft_size = __ilog2(hptSizePages * PAGE_SIZE);
 
         /*
          * The actual hashed page table is in the hypervisor,