Merge master.kernel.org:/pub/scm/linux/kernel/git/paulus/powerpc

* master.kernel.org:/pub/scm/linux/kernel/git/paulus/powerpc: (194 commits)
  [POWERPC] Add missing EXPORTS for mpc52xx support
  [POWERPC] Remove obsolete PPC_52xx and update CLASSIC32 comment
  [POWERPC] ps3: add a default zImage target
  [POWERPC] Add of_platform_bus support to mpc52xx psc uart driver
  [POWERPC] typo fix and whitespace cleanup on mpc52xx-uart driver
  [POWERPC] Fix debug printks for 32-bit resources in the PCI code
  [POWERPC] Replace kmalloc+memset with kzalloc
  [POWERPC] Linkstation / kurobox support
  [POWERPC] Add the e300c3 core to the CPU table.
  [POWERPC] ppc: m48t35 add missing bracket
  [POWERPC] iSeries: don't build head_64.o unnecessarily
  [POWERPC] iSeries: stop dt_mod.o being rebuilt unnecessarily
  [POWERPC] Fix cputable.h for combined build
  [POWERPC] Allow CONFIG_BOOTX_TEXT on iSeries
  [POWERPC] Allow xmon to build on legacy iSeries
  [POWERPC] Change ppc64_defconfig to use AUTOFS_V4 not V3
  [POWERPC] Tell firmware we can handle POWER6 compatible mode
  [POWERPC] Clean images in arch/powerpc/boot
  [POWERPC] Fix OF pci flags parsing
  [POWERPC] defconfig for lite5200 board
  ...

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c
index 034cf6af53a..0870009f56d 100644
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -120,6 +120,33 @@ void spu_unmap_mappings(struct spu_context *ctx)
 		unmap_mapping_range(ctx->signal2, 0, 0x4000, 1);
 }
 
+int spu_acquire_exclusive(struct spu_context *ctx)
+{
+	int ret = 0;
+
+	down_write(&ctx->state_sema);
+	/* ctx is about to be freed, can't acquire any more */
+	if (!ctx->owner) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (ctx->state == SPU_STATE_SAVED) {
+		ret = spu_activate(ctx, 0);
+		if (ret)
+			goto out;
+		ctx->state = SPU_STATE_RUNNABLE;
+	} else {
+		/* We need to exclude userspace access to the context. */
+		spu_unmap_mappings(ctx);
+	}
+
+out:
+	if (ret)
+		up_write(&ctx->state_sema);
+	return ret;
+}
+
 int spu_acquire_runnable(struct spu_context *ctx)
 {
 	int ret = 0;