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authorMatthew Wilcox (Oracle) <willy@infradead.org>2023-08-18 21:23:35 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-08-24 16:20:30 -0700
commit1d024e7a8dabcc3c84d77532a88c774c32cf8245 (patch)
tree054d0ee873c69836f7dae835b19d11006e1e27f6 /drivers/dax
parent40d49a3c9e4a0e5cf7a6fcebc8d4d7d63d1f3f1b (diff)
mm: remove enum page_entry_size
Remove the unnecessary encoding of page order into an enum and pass the page order directly. That lets us get rid of pe_order(). The switch constructs have to be changed to if/else constructs to prevent GCC from warning on builds with 3-level page tables where PMD_ORDER and PUD_ORDER have the same value. If you are looking at this commit because your driver stopped compiling, look at the previous commit as well and audit your driver to be sure it doesn't depend on mmap_lock being held in its ->huge_fault method. [willy@infradead.org: use "order %u" to match the (non dev_t) style] Link: https://lkml.kernel.org/r/ZOUYekbtTv+n8hYf@casper.infradead.org Link: https://lkml.kernel.org/r/20230818202335.2739663-4-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/device.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 30665a3ff6ea..93ebedc5ec8c 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -228,32 +228,26 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
}
#endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
-static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
- enum page_entry_size pe_size)
+static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf, unsigned int order)
{
struct file *filp = vmf->vma->vm_file;
vm_fault_t rc = VM_FAULT_SIGBUS;
int id;
struct dev_dax *dev_dax = filp->private_data;
- dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) size = %d\n", current->comm,
+ dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) order:%d\n", current->comm,
(vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read",
- vmf->vma->vm_start, vmf->vma->vm_end, pe_size);
+ vmf->vma->vm_start, vmf->vma->vm_end, order);
id = dax_read_lock();
- switch (pe_size) {
- case PE_SIZE_PTE:
+ if (order == 0)
rc = __dev_dax_pte_fault(dev_dax, vmf);
- break;
- case PE_SIZE_PMD:
+ else if (order == PMD_ORDER)
rc = __dev_dax_pmd_fault(dev_dax, vmf);
- break;
- case PE_SIZE_PUD:
+ else if (order == PUD_ORDER)
rc = __dev_dax_pud_fault(dev_dax, vmf);
- break;
- default:
+ else
rc = VM_FAULT_SIGBUS;
- }
dax_read_unlock(id);
@@ -262,7 +256,7 @@ static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
static vm_fault_t dev_dax_fault(struct vm_fault *vmf)
{
- return dev_dax_huge_fault(vmf, PE_SIZE_PTE);
+ return dev_dax_huge_fault(vmf, 0);
}
static int dev_dax_may_split(struct vm_area_struct *vma, unsigned long addr)