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powerpc/8xx: Revert commit e0908085fc

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The commit e0908085fc ("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
0a2ab51ffb ("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>
This commit is contained in:
LEROY Christophe 2013-09-11 18:44:44 +02:00 committed by Scott Wood
parent afc4b47372
commit 79df1b374b
1 changed files with 3 additions and 16 deletions
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19
arch/powerpc/mm/pgtable.c
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@ -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);