[POWERPC] Correct the MAX_CONTEXT definition

When we increased the address space per process to 2^44 bytes, the number of contexts that we could actually use reduced, but we forgot to decrease the MAX_CONTEXT definition. (Fortunately this would only cause problems if we actually had more than 512k user processes running.) This patch corrects the definition. Signed-off-by: Paul Mackerras <paulus@samba.org>

[POWERPC] Correct the MAX_CONTEXT definition
When we increased the address space per process to 2^44 bytes, the number of contexts that we could actually use reduced, but we forgot to decrease the MAX_CONTEXT definition. (Fortunately this would only cause problems if we actually had more than 512k user processes running.) This patch corrects the definition. Signed-off-by: Paul Mackerras <paulus@samba.org>
Paul Mackerras
1 parent 489244498e
Showing 1 changed file with 6 additions and 1 deletions Side-by-side Diff
include/asm-powerpc/mmu_context.h
@@ -25,8 +25,13 @@
 {
 }
  
+/*
+ * The proto-VSID space has 2^35 - 1 segments available for user mappings.
+ * Each segment contains 2^28 bytes.  Each context maps 2^44 bytes,
+ * so we can support 2^19-1 contexts (19 == 35 + 28 - 44).
+ */
 #define NO_CONTEXT	0
-#define MAX_CONTEXT	(0x100000-1)
+#define MAX_CONTEXT	((1UL << 19) - 1)
  
 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
 extern void destroy_context(struct mm_struct *mm);
...	...	@@ -25,8 +25,13 @@
25	25	{
26	26	}
27	27
	28	+/*
	29	+ * The proto-VSID space has 2^35 - 1 segments available for user mappings.
	30	+ * Each segment contains 2^28 bytes. Each context maps 2^44 bytes,
	31	+ * so we can support 2^19-1 contexts (19 == 35 + 28 - 44).
	32	+ */
28	33	#define NO_CONTEXT 0
29		-#define MAX_CONTEXT (0x100000-1)
	34	+#define MAX_CONTEXT ((1UL << 19) - 1)
30	35
31	36	extern int init_new_context(struct task_struct tsk, struct mm_struct mm);
32	37	extern void destroy_context(struct mm_struct *mm);