These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / arm / mm / fault.c

diff --git a/kernel/arch/arm/mm/fault.c b/kernel/arch/arm/mm/fault.c
index 62016e3..b8aa1e9 100644 (file)
--- a/kernel/arch/arm/mm/fault.c
+++ b/kernel/arch/arm/mm/fault.c
@@ -599,6 +599,28 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
        arm_notify_die("", regs, &info, ifsr, 0);
 }
 
+/*
+ * Abort handler to be used only during first unmasking of asynchronous aborts
+ * on the boot CPU. This makes sure that the machine will not die if the
+ * firmware/bootloader left an imprecise abort pending for us to trip over.
+ */
+static int __init early_abort_handler(unsigned long addr, unsigned int fsr,
+                                     struct pt_regs *regs)
+{
+       pr_warn("Hit pending asynchronous external abort (FSR=0x%08x) during "
+               "first unmask, this is most likely caused by a "
+               "firmware/bootloader bug.\n", fsr);
+
+       return 0;
+}
+
+void __init early_abt_enable(void)
+{
+       fsr_info[22].fn = early_abort_handler;
+       local_abt_enable();
+       fsr_info[22].fn = do_bad;
+}
+
 #ifndef CONFIG_ARM_LPAE
 static int __init exceptions_init(void)
 {