Revision 4246a9c9682fcced5e5dd997614a3d4f606efe7a authored by Olof Johansson on 05 March 2013, 01:35:06 UTC, committed by Olof Johansson on 05 March 2013, 01:35:15 UTC
From Shawn Guo: The mxs fixes for 3.9: - A few sparse warning fixes - Fix usb function regression caused by usb Kconfig option changes * tag 'mxs-fixes-3.9' of git://git.linaro.org/people/shawnguo/linux-2.6: ARM: mxs: ocotp: Fix sparse warning ARM: mxs: icoll: Fix sparse warning ARM: mxs: mm: Fix sparse warning ARM: mxs_defconfig: Make USB host functional again Signed-off-by: Olof Johansson <olof@lixom.net>
mmu_context.c
/* Copyright (C) 2009 Red Hat, Inc.
*
* See ../COPYING for licensing terms.
*/
#include <linux/mm.h>
#include <linux/mmu_context.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <asm/mmu_context.h>
/*
* use_mm
* Makes the calling kernel thread take on the specified
* mm context.
* Called by the retry thread execute retries within the
* iocb issuer's mm context, so that copy_from/to_user
* operations work seamlessly for aio.
* (Note: this routine is intended to be called only
* from a kernel thread context)
*/
void use_mm(struct mm_struct *mm)
{
struct mm_struct *active_mm;
struct task_struct *tsk = current;
task_lock(tsk);
active_mm = tsk->active_mm;
if (active_mm != mm) {
atomic_inc(&mm->mm_count);
tsk->active_mm = mm;
}
tsk->mm = mm;
switch_mm(active_mm, mm, tsk);
task_unlock(tsk);
if (active_mm != mm)
mmdrop(active_mm);
}
EXPORT_SYMBOL_GPL(use_mm);
/*
* unuse_mm
* Reverses the effect of use_mm, i.e. releases the
* specified mm context which was earlier taken on
* by the calling kernel thread
* (Note: this routine is intended to be called only
* from a kernel thread context)
*/
void unuse_mm(struct mm_struct *mm)
{
struct task_struct *tsk = current;
task_lock(tsk);
sync_mm_rss(mm);
tsk->mm = NULL;
/* active_mm is still 'mm' */
enter_lazy_tlb(mm, tsk);
task_unlock(tsk);
}
EXPORT_SYMBOL_GPL(unuse_mm);
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