is_vm_hugetlb_page has checks for whether CONFIG_HUGETLB_PAGE is defined
or not. If CONFIG_HUGETLB_PAGE is not defined is_vm_hugetlb_page will
always return false. There is no need to have an uneccessary
CONFIG_HUGETLB_PAGE check in the code.
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Dimitri Sivanich <sivanich@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
Signed-off-by: Bharath Vedartham <linux.bhar@xxxxxxxxx>
---
Changes since v2
- Added an 'unlikely' if statement as suggested by William
Kucharski. This is because of the fact that most systems
using this driver won't have CONFIG_HUGE_PAGE enabled and we
optimize the branch with an unlikely.
Signed-off-by: Bharath Vedartham <linux.bhar@xxxxxxxxx>
---
drivers/misc/sgi-gru/grufault.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
index 61b3447..bce47af 100644
--- a/drivers/misc/sgi-gru/grufault.c
+++ b/drivers/misc/sgi-gru/grufault.c
@@ -180,11 +180,11 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
{
struct page *page;
-#ifdef CONFIG_HUGETLB_PAGE
- *pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT;
-#else
- *pageshift = PAGE_SHIFT;
-#endif
+ if (unlikely(is_vm_hugetlb_page(vma)))
+ *pageshift = HPAGE_SHIFT;
+ else
+ *pageshift = PAGE_SHIFT;
+
if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0)
return -EFAULT;
*paddr = page_to_phys(page);
@@ -238,11 +238,12 @@ static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr,
return 1;
*paddr = pte_pfn(pte) << PAGE_SHIFT;
-#ifdef CONFIG_HUGETLB_PAGE
- *pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT;
-#else
- *pageshift = PAGE_SHIFT;
-#endif
+
+ if (unlikely(is_vm_hugetlb_page(vma)))
+ *pageshift = HPAGE_SHIFT;
+ else
+ *pageshift = PAGE_SHIFT;
+
return 0;
err:
--
2.7.4
