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ARM: cacheflush: don't bother rounding to nearest vma

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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 4542b6a0fa ("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>
This commit is contained in:
Will Deacon 2012-08-22 11:06:54 +01:00
parent d9524dc32c
commit 97c72d89ce
1 changed files with 2 additions and 15 deletions
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17
arch/arm/kernel/traps.c
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@ -550,24 +550,11 @@ static long do_cache_op_restart(struct restart_block *unused)
static inline int static inline int
do_cache_op(unsigned long start, unsigned long end, int flags) 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) if (end < start || flags)
return -EINVAL; return -EINVAL;
down_read(&mm->mmap_sem); if (!access_ok(VERIFY_READ, start, end - start))
vma = find_vma(mm, start); return -EFAULT;
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);
return __do_cache_op(start, end); return __do_cache_op(start, end);
} }