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powerpc/8xx: CONFIG_DEBUG_PAGEALLOC requires ITLBmiss for kernel addresses

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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 <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
This commit is contained in:
Christophe Leroy
2016-02-03 23:34:21 +01:00
committed by Scott Wood
parent 501ea76687
commit 921fff351c
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/head_8xx.S
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@@ -329,7 +329,7 @@ InstructionTLBMiss:
/* If we are faulting a kernel address, we have to use the /* If we are faulting a kernel address, we have to use the
* kernel page tables. * kernel page tables.
*/ */
#ifdef CONFIG_MODULES #if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
/* Only modules will cause ITLB Misses as we always /* Only modules will cause ITLB Misses as we always
* pin the first 8MB of kernel memory */ * pin the first 8MB of kernel memory */
mfspr r11, SPRN_SRR0 /* Get effective address of fault */ mfspr r11, SPRN_SRR0 /* Get effective address of fault */