x86/mm/cpa: Move CLFLUSH test into cpa_flush_range()

Rather than guarding all cpa_flush_range() uses with a CLFLUSH test,
put it inside.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Bin Yang <bin.yang@intel.com>
Cc: Mark Gross <mark.gross@intel.com>
Link: https://lkml.kernel.org/r/20180919085948.036195503@infradead.org

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 02eb184..3cc4a2a 100644 (file)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -293,6 +293,11 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
        BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
        WARN_ON(PAGE_ALIGN(start) != start);
 
+       if (!static_cpu_has(X86_FEATURE_CLFLUSH)) {
+               cpa_flush_all(cache);
+               return;
+       }
+
        flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);
 
        if (!cache)
@@ -2078,10 +2083,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
        /*
         * Before changing the encryption attribute, we need to flush caches.
         */
-       if (static_cpu_has(X86_FEATURE_CLFLUSH))
-               cpa_flush_range(start, numpages, 1);
-       else
-               cpa_flush_all(1);
+       cpa_flush_range(start, numpages, 1);
 
        ret = __change_page_attr_set_clr(&cpa, 1);
 
@@ -2092,10 +2094,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
         * in case TLB flushing gets optimized in the cpa_flush_range()
         * path use the same logic as above.
         */
-       if (static_cpu_has(X86_FEATURE_CLFLUSH))
-               cpa_flush_range(start, numpages, 0);
-       else
-               cpa_flush_all(0);
+       cpa_flush_range(start, numpages, 0);
 
        return ret;
 }