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authorLEROY Christophe <christophe.leroy@c-s.fr>2013-09-11 18:44:44 +0200
committerScott Wood <scottwood@freescale.com>2013-10-28 21:11:18 -0500
commit79df1b374ba681f1322a0efd9a88bb85f1462796 (patch)
tree69680b0aa81907e625096b10f7fbf95f95528449 /arch/powerpc/mm
parentafc4b47372ace24c630c1d79b3a0ed32bf1d19fd (diff)
downloadop-kernel-dev-79df1b374ba681f1322a0efd9a88bb85f1462796.zip
op-kernel-dev-79df1b374ba681f1322a0efd9a88bb85f1462796.tar.gz
powerpc/8xx: Revert commit e0908085fc2391c85b85fb814ae1df377c8e0dcb
The commit e0908085fc2391c85b85fb814ae1df377c8e0dcb ("powerpc/8xx: Fix regression introduced by cache coherency rewrite") is not needed anymore. The issue was because dcbst wrongly sets the store bit when causing a DTLB error, but this is now fixed by commit 0a2ab51ffb8dfdf51402dcfb446629648c96bc78 ("powerpc/8xx: Fixup DAR from buggy dcbX instructions.") which handles the buggy dcbx instructions on data page faults on the 8xx. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [scottwood@freescale.com: fix commit message] Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/pgtable.c19
1 files changed, 3 insertions, 16 deletions
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index edda589..841e0d0 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -32,8 +32,6 @@
#include <asm/tlbflush.h>
#include <asm/tlb.h>
-#include "mmu_decl.h"
-
static inline int is_exec_fault(void)
{
return current->thread.regs && TRAP(current->thread.regs) == 0x400;
@@ -72,7 +70,7 @@ struct page * maybe_pte_to_page(pte_t pte)
* support falls into the same category.
*/
-static pte_t set_pte_filter(pte_t pte, unsigned long addr)
+static pte_t set_pte_filter(pte_t pte)
{
pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
if (pte_looks_normal(pte) && !(cpu_has_feature(CPU_FTR_COHERENT_ICACHE) ||
@@ -81,17 +79,6 @@ static pte_t set_pte_filter(pte_t pte, unsigned long addr)
if (!pg)
return pte;
if (!test_bit(PG_arch_1, &pg->flags)) {
-#ifdef CONFIG_8xx
- /* On 8xx, cache control instructions (particularly
- * "dcbst" from flush_dcache_icache) fault as write
- * operation if there is an unpopulated TLB entry
- * for the address in question. To workaround that,
- * we invalidate the TLB here, thus avoiding dcbst
- * misbehaviour.
- */
- /* 8xx doesn't care about PID, size or ind args */
- _tlbil_va(addr, 0, 0, 0);
-#endif /* CONFIG_8xx */
flush_dcache_icache_page(pg);
set_bit(PG_arch_1, &pg->flags);
}
@@ -111,7 +98,7 @@ static pte_t set_access_flags_filter(pte_t pte, struct vm_area_struct *vma,
* as we don't have two bits to spare for _PAGE_EXEC and _PAGE_HWEXEC so
* instead we "filter out" the exec permission for non clean pages.
*/
-static pte_t set_pte_filter(pte_t pte, unsigned long addr)
+static pte_t set_pte_filter(pte_t pte)
{
struct page *pg;
@@ -193,7 +180,7 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
* this context might not have been activated yet when this
* is called.
*/
- pte = set_pte_filter(pte, addr);
+ pte = set_pte_filter(pte);
/* Perform the setting of the PTE */
__set_pte_at(mm, addr, ptep, pte, 0);
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