commit 12aee278b50c4a94a93fa0b4d201ae35d792c696
author Linus Torvalds <torvalds@linux-foundation.org> Wed Oct 30 14:27:10 2013 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Wed Oct 30 14:27:10 2013 -0700
tree 98c0c42c9095aae34d12a4b8c555176698b7202a
parent c56b097af26cb11c1f49a4311ba538c825666fed
parent 5e8cfc3c75b3e43497389896c0ecda62fc311ce9

Merge branch 'akpm' (fixes from Andrew Morton)

Merge three fixes from Andrew Morton.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  memcg: use __this_cpu_sub() to dec stats to avoid incorrect subtrahend casting
  percpu: fix this_cpu_sub() subtrahend casting for unsigneds
  mm/pagewalk.c: fix walk_page_range() access of wrong PTEs

arch/x86/include/asm/percpu.h

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 0da5200..b3e18f8 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -128,7 +128,8 @@
 do {									\
 	typedef typeof(var) pao_T__;					\
 	const int pao_ID__ = (__builtin_constant_p(val) &&		\
-			      ((val) == 1 || (val) == -1)) ? (val) : 0;	\
+			      ((val) == 1 || (val) == -1)) ?		\
+				(int)(val) : 0;				\
 	if (0) {							\
 		pao_T__ pao_tmp__;					\
 		pao_tmp__ = (val);					\

include/linux/percpu.h

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index cc88172..c74088a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -332,7 +332,7 @@
 #endif
 
 #ifndef this_cpu_sub
-# define this_cpu_sub(pcp, val)		this_cpu_add((pcp), -(val))
+# define this_cpu_sub(pcp, val)		this_cpu_add((pcp), -(typeof(pcp))(val))
 #endif
 
 #ifndef this_cpu_inc
@@ -418,7 +418,7 @@
 # define this_cpu_add_return(pcp, val)	__pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 #endif
 
-#define this_cpu_sub_return(pcp, val)	this_cpu_add_return(pcp, -(val))
+#define this_cpu_sub_return(pcp, val)	this_cpu_add_return(pcp, -(typeof(pcp))(val))
 #define this_cpu_inc_return(pcp)	this_cpu_add_return(pcp, 1)
 #define this_cpu_dec_return(pcp)	this_cpu_add_return(pcp, -1)
 
@@ -586,7 +586,7 @@
 #endif
 
 #ifndef __this_cpu_sub
-# define __this_cpu_sub(pcp, val)	__this_cpu_add((pcp), -(val))
+# define __this_cpu_sub(pcp, val)	__this_cpu_add((pcp), -(typeof(pcp))(val))
 #endif
 
 #ifndef __this_cpu_inc
@@ -668,7 +668,7 @@
 	__pcpu_size_call_return2(__this_cpu_add_return_, pcp, val)
 #endif
 
-#define __this_cpu_sub_return(pcp, val)	__this_cpu_add_return(pcp, -(val))
+#define __this_cpu_sub_return(pcp, val)	__this_cpu_add_return(pcp, -(typeof(pcp))(val))
 #define __this_cpu_inc_return(pcp)	__this_cpu_add_return(pcp, 1)
 #define __this_cpu_dec_return(pcp)	__this_cpu_add_return(pcp, -1)
 

mm/memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 34d3ca9..497ec33 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3774,7 +3774,7 @@
 	/* Update stat data for mem_cgroup */
 	preempt_disable();
 	WARN_ON_ONCE(from->stat->count[idx] < nr_pages);
-	__this_cpu_add(from->stat->count[idx], -nr_pages);
+	__this_cpu_sub(from->stat->count[idx], nr_pages);
 	__this_cpu_add(to->stat->count[idx], nr_pages);
 	preempt_enable();
 }

mm/pagewalk.c

diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 5da2cbc..2beeabf 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -242,7 +242,7 @@
 		if (err)
 			break;
 		pgd++;
-	} while (addr = next, addr != end);
+	} while (addr = next, addr < end);
 
 	return err;
 }