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authorWill Deacon <will.deacon@arm.com>2012-08-22 11:06:54 +0100
committerWill Deacon <will.deacon@arm.com>2013-08-20 11:54:55 +0100
commit97c72d89ce0ec8c73f19d5e35ec1f90f7a14bed7 (patch)
tree3711daf93348310350bd1a94f89f5ccce092397e /arch/arm/kernel
parentd9524dc32cab52714dee0c8e59c7437ee33a239a (diff)
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ARM: cacheflush: don't bother rounding to nearest vma
do_cache_op finds the lowest VMA contained in the specified address range and rounds the range to cover only the mapped addresses. Since commit 4542b6a0fa6b ("ARM: 7365/1: drop unused parameter from flush_cache_user_range") the VMA is not used for anything else in this code and seeing as the low-level cache flushing routines return -EFAULT if the address is not valid, there is no need for this range truncation. This patch removes the VMA handling code from the cacheflushing syscall. Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/traps.c17
1 files changed, 2 insertions, 15 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 4d268d9..9b2c5d4 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -550,24 +550,11 @@ static long do_cache_op_restart(struct restart_block *unused)
static inline int
do_cache_op(unsigned long start, unsigned long end, int flags)
{
- struct mm_struct *mm = current->active_mm;
- struct vm_area_struct *vma;
-
if (end < start || flags)
return -EINVAL;
- down_read(&mm->mmap_sem);
- vma = find_vma(mm, start);
- if (!vma || vma->vm_start >= end) {
- up_read(&mm->mmap_sem);
- return -EINVAL;
- }
-
- if (start < vma->vm_start)
- start = vma->vm_start;
- if (end > vma->vm_end)
- end = vma->vm_end;
- up_read(&mm->mmap_sem);
+ if (!access_ok(VERIFY_READ, start, end - start))
+ return -EFAULT;
return __do_cache_op(start, end);
}