diff options
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index f60b93dc2e5..456ad0ab9c7 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -52,21 +52,23 @@ void clflush_cache_range(void *vaddr, unsigned int size) static void __cpa_flush_all(void *arg) { + unsigned long cache = (unsigned long)arg; + /* * Flush all to work around Errata in early athlons regarding * large page flushing. */ __flush_tlb_all(); - if (boot_cpu_data.x86_model >= 4) + if (cache && boot_cpu_data.x86_model >= 4) wbinvd(); } -static void cpa_flush_all(void) +static void cpa_flush_all(unsigned long cache) { BUG_ON(irqs_disabled()); - on_each_cpu(__cpa_flush_all, NULL, 1, 1); + on_each_cpu(__cpa_flush_all, (void *) cache, 1, 1); } static void __cpa_flush_range(void *arg) @@ -79,7 +81,7 @@ static void __cpa_flush_range(void *arg) __flush_tlb_all(); } -static void cpa_flush_range(unsigned long start, int numpages) +static void cpa_flush_range(unsigned long start, int numpages, int cache) { unsigned int i, level; unsigned long addr; @@ -89,6 +91,9 @@ static void cpa_flush_range(unsigned long start, int numpages) on_each_cpu(__cpa_flush_range, NULL, 1, 1); + if (!cache) + return; + /* * We only need to flush on one CPU, * clflush is a MESI-coherent instruction that @@ -402,10 +407,16 @@ static int __change_page_attr_set_clr(unsigned long addr, int numpages, return 0; } +static inline int cache_attr(pgprot_t attr) +{ + return pgprot_val(attr) & + (_PAGE_PAT | _PAGE_PAT_LARGE | _PAGE_PWT | _PAGE_PCD); +} + static int change_page_attr_set_clr(unsigned long addr, int numpages, pgprot_t mask_set, pgprot_t mask_clr) { - int ret; + int ret, cache; /* * Check, if we are requested to change a not supported @@ -419,15 +430,21 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages, ret = __change_page_attr_set_clr(addr, numpages, mask_set, mask_clr); /* + * No need to flush, when we did not set any of the caching + * attributes: + */ + cache = cache_attr(mask_set); + + /* * On success we use clflush, when the CPU supports it to * avoid the wbindv. If the CPU does not support it and in the * error case we fall back to cpa_flush_all (which uses * wbindv): */ if (!ret && cpu_has_clflush) - cpa_flush_range(addr, numpages); + cpa_flush_range(addr, numpages, cache); else - cpa_flush_all(); + cpa_flush_all(cache); return ret; } |