[PATCH] powerpc/8xx: CONFIG_DEBUG_PAGEALLOC requires ITLBmiss for kernel addresses
From: Christophe Leroy <hidden>
Date: 2016-02-03 23:02:00
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
When CONFIG_DEBUG_PAGEALLOC is activated, the initial TLB mapping gets flushed to track accesses to wrong areas. Therefore, kernel addresses will also generate ITLB misses. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/kernel/head_8xx.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 78c1eba..e629e28 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S@@ -329,7 +329,7 @@ InstructionTLBMiss: /* If we are faulting a kernel address, we have to use the * kernel page tables. */ -#ifdef CONFIG_MODULES +#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) /* Only modules will cause ITLB Misses as we always * pin the first 8MB of kernel memory */ mfspr r11, SPRN_SRR0 /* Get effective address of fault */
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2.1.0