diff options
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index e3353c97d086..28d42130243c 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -20,7 +20,7 @@ #include <asm/tlbflush.h> #include <asm/sections.h> #include <asm/setup.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/pgalloc.h> #include <asm/proto.h> #include <asm/pat.h> @@ -214,7 +214,20 @@ static void cpa_flush_array(unsigned long *start, int numpages, int cache, int in_flags, struct page **pages) { unsigned int i, level; +#ifdef CONFIG_PREEMPT + /* + * Avoid wbinvd() because it causes latencies on all CPUs, + * regardless of any CPU isolation that may be in effect. + * + * This should be extended for CAT enabled systems independent of + * PREEMPT because wbinvd() does not respect the CAT partitions and + * this is exposed to unpriviledged users through the graphics + * subsystem. + */ + unsigned long do_wbinvd = 0; +#else unsigned long do_wbinvd = cache && numpages >= 1024; /* 4M threshold */ +#endif BUG_ON(irqs_disabled()); |