# \[PATCH 14/15\] 8xx: Optimize ITLBMiss handler.

- From: Joakim Tjernlund \<hidden\>
- Date: 2011-06-14 14:05:42 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2011/06/9464891
- Thread: https://ratatoskr.run/linuxppc-dev/2011/06/9464890/t.md

```text
Don't check for kernel space if no modules.

Signed-off-by: Joakim Tjernlund <redacted>
---
 arch/ppc/kernel/head_8xx.S |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/ppc/kernel/head_8xx.S b/arch/ppc/kernel/head_8xx.S
index a4290b5..7f9e647 100644
--- a/arch/ppc/kernel/head_8xx.S
+++ b/arch/ppc/kernel/head_8xx.S
@@ -355,12 +355,17 @@ InstructionTLBMiss:
 	/* If we are faulting a kernel address, we have to use the
 	 * kernel page tables.
 	 */
+#ifdef CONFIG_MODULES
+	/* Since we PIN the first 8MB text, we only get ITLB misses
+	 * for modules
+	 */
 	andi.	r21, r20, 0x0800	/* Address >= 0x80000000 */
 	beq	3f
 	lis	r21, swapper_pg_dir@h
 	ori	r21, r21, swapper_pg_dir@l
 	rlwimi	r20, r21, 0, 2, 19
 3:
+#endif
 	lwz	r21, 0(r20)	/* Get the level 1 entry */
 	rlwinm.	r20, r21,0,0,19	/* Extract page descriptor page address */
 
-- 
1.7.3.4
```