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authorPaul Mackerras <paulus@samba.org>2005-10-10 21:52:43 +1000
committerPaul Mackerras <paulus@samba.org>2005-10-10 21:52:43 +1000
commit70d64ceaa1a84d2502405422a4dfd3f87786a347 (patch)
tree23e38168021988d34b11c6f41cfff82f8095092e /arch/powerpc/mm/mmu_context_64.c
parenta432403a89646614252c3bb6dfbe897c8312ab35 (diff)
powerpc: Rename files to have consistent _32/_64 suffixes
This doesn't change any code, just renames things so we consistently have foo_32.c and foo_64.c where we have separate 32- and 64-bit versions. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/mm/mmu_context_64.c')
-rw-r--r--arch/powerpc/mm/mmu_context_64.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mmu_context_64.c b/arch/powerpc/mm/mmu_context_64.c
new file mode 100644
index 00000000000..714a84dd8d5
--- /dev/null
+++ b/arch/powerpc/mm/mmu_context_64.c
@@ -0,0 +1,63 @@
+/*
+ * MMU context allocation for 64-bit kernels.
+ *
+ * Copyright (C) 2004 Anton Blanchard, IBM Corp. <anton@samba.org>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/idr.h>
+
+#include <asm/mmu_context.h>
+
+static DEFINE_SPINLOCK(mmu_context_lock);
+static DEFINE_IDR(mmu_context_idr);
+
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+ int index;
+ int err;
+
+again:
+ if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL))
+ return -ENOMEM;
+
+ spin_lock(&mmu_context_lock);
+ err = idr_get_new_above(&mmu_context_idr, NULL, 1, &index);
+ spin_unlock(&mmu_context_lock);
+
+ if (err == -EAGAIN)
+ goto again;
+ else if (err)
+ return err;
+
+ if (index > MAX_CONTEXT) {
+ idr_remove(&mmu_context_idr, index);
+ return -ENOMEM;
+ }
+
+ mm->context.id = index;
+
+ return 0;
+}
+
+void destroy_context(struct mm_struct *mm)
+{
+ spin_lock(&mmu_context_lock);
+ idr_remove(&mmu_context_idr, mm->context.id);
+ spin_unlock(&mmu_context_lock);
+
+ mm->context.id = NO_CONTEXT;
+}