Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (249 commits)
  powerpc: Fix pte_update for CONFIG_PTE_64BIT and !PTE_ATOMIC_UPDATES
  powerpc: Fix a build problem on ppc32 with new DMA_ATTRs
  ibm_newemac: Add MII mode support to the EMAC RGMII bridge.
  powerpc: Don't spin on sync instruction at boot time
  powerpc: Add VSX load/store alignment exception handler
  powerpc: fix giveup_vsx to save registers correctly
  powerpc: support for latencytop
  powerpc: Remove unnecessary condition when sanity-checking WIMG bits
  powerpc: Add PPC_FEATURE_PSERIES_PERFMON_COMPAT
  powerpc: Add driver for Barrier Synchronization Register
  powerpc: mman.h export fixups
  powerpc/fsl: update crypto node definition and device tree instances
  powerpc/fsl: Refactor device bindings
  powerpc/85xx: Minor fixes for 85xxds and 8536ds board.
  powerpc: Add 82xx/83xx/86xx to 6xx Multiplatform
  powerpc/85xx: publish of device for cds platforms
  powerpc/booke: don't reinitialize time base
  powerpc/86xx: Refactor pic init
  powerpc/CPM: Add i2c pins to dts and board setup
  cpm_uart: Support uart_wait_until_sent()
  ...

1 files changed, 28 insertions, 1 deletions

diff --git a/arch/powerpc/mm/44x_mmu.c b/arch/powerpc/mm/44x_mmu.c
index 953fb919eb0..98052ac9658 100644
--- a/arch/powerpc/mm/44x_mmu.c
+++ b/arch/powerpc/mm/44x_mmu.c
@@ -27,6 +27,7 @@
 #include <asm/mmu.h>
 #include <asm/system.h>
 #include <asm/page.h>
+#include <asm/cacheflush.h>
 
 #include "mmu_decl.h"
 
@@ -37,11 +38,35 @@ unsigned int tlb_44x_index; /* = 0 */
 unsigned int tlb_44x_hwater = PPC44x_TLB_SIZE - 1 - PPC44x_EARLY_TLBS;
 int icache_44x_need_flush;
 
+static void __init ppc44x_update_tlb_hwater(void)
+{
+	extern unsigned int tlb_44x_patch_hwater_D[];
+	extern unsigned int tlb_44x_patch_hwater_I[];
+
+	/* The TLB miss handlers hard codes the watermark in a cmpli
+	 * instruction to improve performances rather than loading it
+	 * from the global variable. Thus, we patch the instructions
+	 * in the 2 TLB miss handlers when updating the value
+	 */
+	tlb_44x_patch_hwater_D[0] = (tlb_44x_patch_hwater_D[0] & 0xffff0000) |
+		tlb_44x_hwater;
+	flush_icache_range((unsigned long)&tlb_44x_patch_hwater_D[0],
+			   (unsigned long)&tlb_44x_patch_hwater_D[1]);
+	tlb_44x_patch_hwater_I[0] = (tlb_44x_patch_hwater_I[0] & 0xffff0000) |
+		tlb_44x_hwater;
+	flush_icache_range((unsigned long)&tlb_44x_patch_hwater_I[0],
+			   (unsigned long)&tlb_44x_patch_hwater_I[1]);
+}
+
 /*
  * "Pins" a 256MB TLB entry in AS0 for kernel lowmem
  */
 static void __init ppc44x_pin_tlb(unsigned int virt, unsigned int phys)
 {
+	unsigned int entry = tlb_44x_hwater--;
+
+	ppc44x_update_tlb_hwater();
+
 	__asm__ __volatile__(
 		"tlbwe	%2,%3,%4\n"
 		"tlbwe	%1,%3,%5\n"
@@ -50,7 +75,7 @@ static void __init ppc44x_pin_tlb(unsigned int virt, unsigned int phys)
 	: "r" (PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G),
 	  "r" (phys),
 	  "r" (virt | PPC44x_TLB_VALID | PPC44x_TLB_256M),
-	  "r" (tlb_44x_hwater--), /* slot for this TLB entry */
+	  "r" (entry),
 	  "i" (PPC44x_TLB_PAGEID),
 	  "i" (PPC44x_TLB_XLAT),
 	  "i" (PPC44x_TLB_ATTRIB));
@@ -58,6 +83,8 @@ static void __init ppc44x_pin_tlb(unsigned int virt, unsigned int phys)
 
 void __init MMU_init_hw(void)
 {
+	ppc44x_update_tlb_hwater();
+
 	flush_instruction_cache();
 }