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authorPaul Mackerras <paulus@samba.org>2006-06-29 16:16:15 +1000
committerPaul Mackerras <paulus@samba.org>2006-06-29 16:16:15 +1000
commit1729dc7833014eaba3520091a673dbdc9242d9f9 (patch)
treea0d72d55ae7bf9c256d7e4ddfea9997a827896fb /include/asm-powerpc/mmu_context.h
parent489244498ec99c949ecbd7105299066cff283dcd (diff)
[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>
Diffstat (limited to 'include/asm-powerpc/mmu_context.h')
-rw-r--r--include/asm-powerpc/mmu_context.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/asm-powerpc/mmu_context.h b/include/asm-powerpc/mmu_context.h
index 8c6b1a6d944f..083ac917bd29 100644
--- a/include/asm-powerpc/mmu_context.h
+++ b/include/asm-powerpc/mmu_context.h
@@ -25,8 +25,13 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
{
}
+/*
+ * 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);