Merge branch 'akpm' (incoming from Andrew)

Merge patches from Andrew Morton:
 "Six fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  lib/percpu_counter.c: fix __percpu_counter_add()
  crash_dump: fix compilation error (on MIPS at least)
  mm: fix crash when using XFS on loopback
  MIPS: fix blast_icache32 on loongson2
  MIPS: fix case mismatch in local_r4k_flush_icache_range()
  nilfs2: fix segctor bug that causes file system corruption

arch/mips/include/asm/cacheops.h

@@ -83,6 +83,6 @@
 /*
  * Loongson2-specific cacheops
  */
-#define Hit_Invalidate_I_Loongson23	0x00
+#define Hit_Invalidate_I_Loongson2	0x00
 
 #endif	/* __ASM_CACHEOPS_H */

arch/mips/include/asm/r4kcache.h

@@ -165,7 +165,7 @@ static inline void flush_icache_line(unsigned long addr)
 	__iflush_prologue
 	switch (boot_cpu_type()) {
 	case CPU_LOONGSON2:
-		cache_op(Hit_Invalidate_I_Loongson23, addr);
+		cache_op(Hit_Invalidate_I_Loongson2, addr);
 		break;
 
 	default:
@@ -219,7 +219,7 @@ static inline void protected_flush_icache_line(unsigned long addr)
 {
 	switch (boot_cpu_type()) {
 	case CPU_LOONGSON2:
-		protected_cache_op(Hit_Invalidate_I_Loongson23, addr);
+		protected_cache_op(Hit_Invalidate_I_Loongson2, addr);
 		break;
 
 	default:
@@ -357,8 +357,8 @@ static inline void invalidate_tcache_page(unsigned long addr)
 		  "i" (op));
 
 /* build blast_xxx, blast_xxx_page, blast_xxx_page_indexed */
-#define __BUILD_BLAST_CACHE(pfx, desc, indexop, hitop, lsize) \
-static inline void blast_##pfx##cache##lsize(void)			\
+#define __BUILD_BLAST_CACHE(pfx, desc, indexop, hitop, lsize, extra)	\
+static inline void extra##blast_##pfx##cache##lsize(void)		\
 {									\
 	unsigned long start = INDEX_BASE;				\
 	unsigned long end = start + current_cpu_data.desc.waysize;	\
@@ -376,7 +376,7 @@ static inline void blast_##pfx##cache##lsize(void)			\
 	__##pfx##flush_epilogue						\
 }									\
 									\
-static inline void blast_##pfx##cache##lsize##_page(unsigned long page) \
+static inline void extra##blast_##pfx##cache##lsize##_page(unsigned long page) \
 {									\
 	unsigned long start = page;					\
 	unsigned long end = page + PAGE_SIZE;				\
@@ -391,7 +391,7 @@ static inline void blast_##pfx##cache##lsize##_page(unsigned long page) \
 	__##pfx##flush_epilogue						\
 }									\
 									\
-static inline void blast_##pfx##cache##lsize##_page_indexed(unsigned long page) \
+static inline void extra##blast_##pfx##cache##lsize##_page_indexed(unsigned long page) \
 {									\
 	unsigned long indexmask = current_cpu_data.desc.waysize - 1;	\
 	unsigned long start = INDEX_BASE + (page & indexmask);		\
@@ -410,23 +410,24 @@ static inline void blast_##pfx##cache##lsize##_page_indexed(unsigned long page)
 	__##pfx##flush_epilogue						\
 }
 
-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16)
-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 16)
-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 16)
-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 32)
-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 32)
-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 32)
-__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 64)
-__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64)
-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 64)
-__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 128)
-
-__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 16)
-__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 32)
-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 16)
-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 32)
-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 64)
-__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 128)
+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 16, )
+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 16, )
+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 16, )
+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 32, )
+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 32, )
+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I_Loongson2, 32, loongson2_)
+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 32, )
+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 64, )
+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64, )
+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 64, )
+__BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 128, )
+
+__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 16, )
+__BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 32, )
+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 16, )
+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 32, )
+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 64, )
+__BUILD_BLAST_CACHE(inv_s, scache, Index_Writeback_Inv_SD, Hit_Invalidate_SD, 128, )
 
 /* build blast_xxx_range, protected_blast_xxx_range */
 #define __BUILD_BLAST_CACHE_RANGE(pfx, desc, hitop, prot, extra)	\
@@ -452,8 +453,8 @@ static inline void prot##extra##blast_##pfx##cache##_range(unsigned long start,
 __BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, protected_, )
 __BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, protected_, )
 __BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I, protected_, )
-__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I_Loongson23, \
-	protected_, loongson23_)
+__BUILD_BLAST_CACHE_RANGE(i, icache, Hit_Invalidate_I_Loongson2, \
+	protected_, loongson2_)
 __BUILD_BLAST_CACHE_RANGE(d, dcache, Hit_Writeback_Inv_D, , )
 __BUILD_BLAST_CACHE_RANGE(s, scache, Hit_Writeback_Inv_SD, , )
 /* blast_inv_dcache_range */

arch/mips/mm/c-r4k.c

@@ -237,6 +237,8 @@ static void r4k_blast_icache_page_setup(void)
 		r4k_blast_icache_page = (void *)cache_noop;
 	else if (ic_lsize == 16)
 		r4k_blast_icache_page = blast_icache16_page;
+	else if (ic_lsize == 32 && current_cpu_type() == CPU_LOONGSON2)
+		r4k_blast_icache_page = loongson2_blast_icache32_page;
 	else if (ic_lsize == 32)
 		r4k_blast_icache_page = blast_icache32_page;
 	else if (ic_lsize == 64)
@@ -261,6 +263,9 @@ static void r4k_blast_icache_page_indexed_setup(void)
 		else if (TX49XX_ICACHE_INDEX_INV_WAR)
 			r4k_blast_icache_page_indexed =
 				tx49_blast_icache32_page_indexed;
+		else if (current_cpu_type() == CPU_LOONGSON2)
+			r4k_blast_icache_page_indexed =
+				loongson2_blast_icache32_page_indexed;
 		else
 			r4k_blast_icache_page_indexed =
 				blast_icache32_page_indexed;
@@ -284,6 +289,8 @@ static void r4k_blast_icache_setup(void)
 			r4k_blast_icache = blast_r4600_v1_icache32;
 		else if (TX49XX_ICACHE_INDEX_INV_WAR)
 			r4k_blast_icache = tx49_blast_icache32;
+		else if (current_cpu_type() == CPU_LOONGSON2)
+			r4k_blast_icache = loongson2_blast_icache32;
 		else
 			r4k_blast_icache = blast_icache32;
 	} else if (ic_lsize == 64)
@@ -580,11 +587,11 @@ static inline void local_r4k_flush_icache_range(unsigned long start, unsigned lo
 	else {
 		switch (boot_cpu_type()) {
 		case CPU_LOONGSON2:
-			protected_blast_icache_range(start, end);
+			protected_loongson2_blast_icache_range(start, end);
 			break;
 
 		default:
-			protected_loongson23_blast_icache_range(start, end);
+			protected_blast_icache_range(start, end);
 			break;
 		}
 	}

fs/nilfs2/segment.c

@@ -1440,17 +1440,19 @@ static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
 
 		nilfs_clear_logs(&sci->sc_segbufs);
 
-		err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
-		if (unlikely(err))
-			return err;
-
 		if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
 			err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
 							sci->sc_freesegs,
 							sci->sc_nfreesegs,
 							NULL);
 			WARN_ON(err); /* do not happen */
+			sci->sc_stage.flags &= ~NILFS_CF_SUFREED;
 		}
+
+		err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
+		if (unlikely(err))
+			return err;
+
 		nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
 		sci->sc_stage = prev_stage;
 	}

include/linux/crash_dump.h

@@ -6,6 +6,8 @@
 #include <linux/proc_fs.h>
 #include <linux/elf.h>
 
+#include <asm/pgtable.h> /* for pgprot_t */
+
 #define ELFCORE_ADDR_MAX	(-1ULL)
 #define ELFCORE_ADDR_ERR	(-2ULL)
 

lib/percpu_counter.c

@@ -82,10 +82,10 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
 		unsigned long flags;
 		raw_spin_lock_irqsave(&fbc->lock, flags);
 		fbc->count += count;
+		 __this_cpu_sub(*fbc->counters, count);
 		raw_spin_unlock_irqrestore(&fbc->lock, flags);
-		__this_cpu_write(*fbc->counters, 0);
 	} else {
-		__this_cpu_write(*fbc->counters, count);
+		this_cpu_add(*fbc->counters, amount);
 	}
 	preempt_enable();
 }

mm/util.c

@@ -390,7 +390,10 @@ struct address_space *page_mapping(struct page *page)
 {
 	struct address_space *mapping = page->mapping;
 
-	VM_BUG_ON(PageSlab(page));
+	/* This happens if someone calls flush_dcache_page on slab page */
+	if (unlikely(PageSlab(page)))
+		return NULL;
+
 	if (unlikely(PageSwapCache(page))) {
 		swp_entry_t entry;