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powerpc/powernv/memtrace: Remove memtrace mmap() 

debugfs doesn't support mmap(), so this code is never used.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Neuling 2018-06-29 10:12:09 +10:00 committed by Michael Ellerman
parent d3d4ffaae4
commit 7dea6f2f05
1 changed files with 0 additions and 29 deletions
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29
arch/powerpc/platforms/powernv/memtrace.c
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@ -47,38 +47,9 @@ static ssize_t memtrace_read(struct file *filp, char __user *ubuf,
return simple_read_from_buffer(ubuf, count, ppos, ent->mem, ent->size);
}
static bool valid_memtrace_range(struct memtrace_entry *dev,
unsigned long start, unsigned long size)
{
if ((start >= dev->start) &&
((start + size) <= (dev->start + dev->size)))
return true;
return false;
}
static int memtrace_mmap(struct file *filp, struct vm_area_struct *vma)
{
unsigned long size = vma->vm_end - vma->vm_start;
struct memtrace_entry *dev = filp->private_data;
if (!valid_memtrace_range(dev, vma->vm_pgoff << PAGE_SHIFT, size))
return -EINVAL;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (remap_pfn_range(vma, vma->vm_start,
vma->vm_pgoff + (dev->start >> PAGE_SHIFT),
size, vma->vm_page_prot))
return -EAGAIN;
return 0;
}
static const struct file_operations memtrace_fops = {
.llseek = default_llseek,
.read = memtrace_read,
.mmap = memtrace_mmap,
.open = simple_open,
};