arm64/mm: Define esr_to_debug_fault_info()

fault_info[] and debug_fault_info[] are static arrays defining memory abort
exception handling functions looking into ESR fault status code encodings.
As esr_to_fault_info() is already available providing fault_info[] array
lookup, it really makes sense to have a corresponding debug_fault_info[]
array lookup function as well. This just adds an equivalent helper function
esr_to_debug_fault_info().

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 0e0ea5f..1aa487a 100644 (file)
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -56,12 +56,18 @@ struct fault_info {
 };
 
 static const struct fault_info fault_info[];
+static struct fault_info debug_fault_info[];
 
 static inline const struct fault_info *esr_to_fault_info(unsigned int esr)
 {
        return fault_info + (esr & ESR_ELx_FSC);
 }
 
+static inline const struct fault_info *esr_to_debug_fault_info(unsigned int esr)
+{
+       return debug_fault_info + DBG_ESR_EVT(esr);
+}
+
 #ifdef CONFIG_KPROBES
 static inline int notify_page_fault(struct pt_regs *regs, unsigned int esr)
 {
@@ -830,7 +836,7 @@ asmlinkage int __exception do_debug_exception(unsigned long addr,
                                              unsigned int esr,
                                              struct pt_regs *regs)
 {
-       const struct fault_info *inf = debug_fault_info + DBG_ESR_EVT(esr);
+       const struct fault_info *inf = esr_to_debug_fault_info(esr);
        int rv;
 
        /*