Merge remote-tracking branch 'lsk/v3.10/topic/gator' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / arch / x86 / mm / fault.c

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 654be4ae30475d881dc07831cb3129d153d5f7c9..c1e9e4cbbd76d4aa1835e1e96715e098a003b6d0 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -989,6 +989,12 @@ static int fault_in_kernel_space(unsigned long address)
 
 static inline bool smap_violation(int error_code, struct pt_regs *regs)
 {
+       if (!IS_ENABLED(CONFIG_X86_SMAP))
+               return false;
+
+       if (!static_cpu_has(X86_FEATURE_SMAP))
+               return false;
+
        if (error_code & PF_USER)
                return false;
 
@@ -1091,11 +1097,9 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code)
        if (unlikely(error_code & PF_RSVD))
                pgtable_bad(regs, error_code, address);
 
-       if (static_cpu_has(X86_FEATURE_SMAP)) {
-               if (unlikely(smap_violation(error_code, regs))) {
-                       bad_area_nosemaphore(regs, error_code, address);
-                       return;
-               }
+       if (unlikely(smap_violation(error_code, regs))) {
+               bad_area_nosemaphore(regs, error_code, address);
+               return;
        }
 
        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);