diff options
author | Paul Mackerras <paulus@samba.org> | 2005-10-10 21:52:43 +1000 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2005-10-10 21:52:43 +1000 |
commit | 70d64ceaa1a84d2502405422a4dfd3f87786a347 (patch) | |
tree | 23e38168021988d34b11c6f41cfff82f8095092e /arch/powerpc/mm/mmu_context_64.c | |
parent | a432403a89646614252c3bb6dfbe897c8312ab35 (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.c | 63 |
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; +} |