[PATCH 2/7] POWERPC 8xx: platform specific mmu updates
From: Vitaly Bordug <hidden>
Date: 2007-01-24 19:41:11
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
This is just a straight port of the same done in arch/ppc by Marcelo Tosatti. One used to be [PATCH] ppc32 8xx: update_mmu_cache() needs unconditional tlbie, commit eb07d964b4491d1bb5864cd3d7e7633ccdda9a53 In a nutshell, the board is nearly stuck without this, yet without any visible failure - being just very slow. Signed-off-by: Vitaly Bordug <redacted> --- arch/powerpc/mm/mem.c | 20 ++++++++++---------- 1 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index d1c0758..c85eda6 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c@@ -490,19 +490,19 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, !cpu_has_feature(CPU_FTR_NOEXECUTE) && pfn_valid(pfn)) { struct page *page = pfn_to_page(pfn); +#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. + */ + _tlbie(address); +#endif if (!PageReserved(page) && !test_bit(PG_arch_1, &page->flags)) { if (vma->vm_mm == current->active_mm) { -#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. - */ - _tlbie(address); -#endif __flush_dcache_icache((void *) address); } else flush_dcache_icache_page(page);