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: (38 commits)
  ps3flash: Always read chunks of 256 KiB, and cache them
  ps3flash: Cache the last accessed FLASH chunk
  ps3: Replace direct file operations by callback
  ps3: Switch ps3_os_area_[gs]et_rtc_diff to EXPORT_SYMBOL_GPL()
  ps3: Correct debug message in dma_ioc0_map_pages()
  drivers/ps3: Add missing annotations
  ps3fb: Use ps3_system_bus_[gs]et_drvdata() instead of direct access
  ps3flash: Use ps3_system_bus_[gs]et_drvdata() instead of direct access
  ps3: shorten ps3_system_bus_[gs]et_driver_data to ps3_system_bus_[gs]et_drvdata
  ps3: Use dev_[gs]et_drvdata() instead of direct access for system bus devices
  block/ps3: remove driver_data direct access of struct device
  ps3vram: Make ps3vram_priv.reports a void *
  ps3vram: Remove no longer used ps3vram_priv.ddr_base
  ps3vram: Replace mutex by spinlock + bio_list
  block: Add bio_list_peek()
  powerpc: Use generic atomic64_t implementation on 32-bit processors
  lib: Provide generic atomic64_t implementation
  powerpc: Add compiler memory barrier to mtmsr macro
  powerpc/iseries: Mark signal_vsp_instruction() as maybe unused
  powerpc/iseries: Fix unused function warning in iSeries DT code
  ...

2 files changed, 47 insertions, 0 deletions

diff --git a/include/asm-generic/atomic64.h b/include/asm-generic/atomic64.h
new file mode 100644
index 000000000000..b18ce4f9ee3d
--- /dev/null
+++ b/include/asm-generic/atomic64.h
@@ -0,0 +1,42 @@
+/*
+ * Generic implementation of 64-bit atomics using spinlocks,
+ * useful on processors that don't have 64-bit atomic instructions.
+ *
+ * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _ASM_GENERIC_ATOMIC64_H
+#define _ASM_GENERIC_ATOMIC64_H
+
+typedef struct {
+	long long counter;
+} atomic64_t;
+
+#define ATOMIC64_INIT(i)	{ (i) }
+
+extern long long atomic64_read(const atomic64_t *v);
+extern void	 atomic64_set(atomic64_t *v, long long i);
+extern void	 atomic64_add(long long a, atomic64_t *v);
+extern long long atomic64_add_return(long long a, atomic64_t *v);
+extern void	 atomic64_sub(long long a, atomic64_t *v);
+extern long long atomic64_sub_return(long long a, atomic64_t *v);
+extern long long atomic64_dec_if_positive(atomic64_t *v);
+extern long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n);
+extern long long atomic64_xchg(atomic64_t *v, long long new);
+extern int	 atomic64_add_unless(atomic64_t *v, long long a, long long u);
+
+#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)
+#define atomic64_inc(v)			atomic64_add(1LL, (v))
+#define atomic64_inc_return(v)		atomic64_add_return(1LL, (v))
+#define atomic64_inc_and_test(v) 	(atomic64_inc_return(v) == 0)
+#define atomic64_sub_and_test(a, v)	(atomic64_sub_return((a), (v)) == 0)
+#define atomic64_dec(v)			atomic64_sub(1LL, (v))
+#define atomic64_dec_return(v)		atomic64_sub_return(1LL, (v))
+#define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)
+#define atomic64_inc_not_zero(v) 	atomic64_add_unless((v), 1LL, 0LL)
+
+#endif  /*  _ASM_GENERIC_ATOMIC64_H  */
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 12737be58601..2a04eb54c0dd 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -590,6 +590,11 @@ static inline void bio_list_merge_head(struct bio_list *bl,
 	bl->head = bl2->head;
 }
 
+static inline struct bio *bio_list_peek(struct bio_list *bl)
+{
+	return bl->head;
+}
+
 static inline struct bio *bio_list_pop(struct bio_list *bl)
 {
 	struct bio *bio = bl->head;