arm64: debug: rename enum debug_el to avoid symbol collision

lib/list_sort.c defines a 'struct debug_el', where "el" is assumedly a
a contraction of "element". This conflicts with 'enum debug_el' in our
asm/debug-monitors.h header file, where "el" stands for Exception Level.

The result is build failure when targetting allmodconfig, so rename our
enum to 'dbg_active_el' to be slightly more explicit about what it is.
Signed-off-by: Will Deacon <will.deacon@arm.com>

arch/arm64/include/asm/debug-monitors.h

@@ -115,13 +115,13 @@ void unregister_break_hook(struct break_hook *hook);
 
 u8 debug_monitors_arch(void);
 
-enum debug_el {
+enum dbg_active_el {
 	DBG_ACTIVE_EL0 = 0,
 	DBG_ACTIVE_EL1,
 };
 
-void enable_debug_monitors(enum debug_el el);
-void disable_debug_monitors(enum debug_el el);
+void enable_debug_monitors(enum dbg_active_el el);
+void disable_debug_monitors(enum dbg_active_el el);
 
 void user_rewind_single_step(struct task_struct *task);
 void user_fastforward_single_step(struct task_struct *task);

arch/arm64/kernel/debug-monitors.c

@@ -82,7 +82,7 @@ early_param("nodebugmon", early_debug_disable);
 static DEFINE_PER_CPU(int, mde_ref_count);
 static DEFINE_PER_CPU(int, kde_ref_count);
 
-void enable_debug_monitors(enum debug_el el)
+void enable_debug_monitors(enum dbg_active_el el)
 {
 	u32 mdscr, enable = 0;
 
@@ -102,7 +102,7 @@ void enable_debug_monitors(enum debug_el el)
 	}
 }
 
-void disable_debug_monitors(enum debug_el el)
+void disable_debug_monitors(enum dbg_active_el el)
 {
 	u32 mdscr, disable = 0;
 

arch/arm64/kernel/hw_breakpoint.c

@@ -156,7 +156,7 @@ static void write_wb_reg(int reg, int n, u64 val)
  * Convert a breakpoint privilege level to the corresponding exception
  * level.
  */
-static enum debug_el debug_exception_level(int privilege)
+static enum dbg_active_el debug_exception_level(int privilege)
 {
 	switch (privilege) {
 	case AARCH64_BREAKPOINT_EL0:
@@ -230,7 +230,7 @@ static int hw_breakpoint_control(struct perf_event *bp,
 	struct perf_event **slots;
 	struct debug_info *debug_info = &current->thread.debug;
 	int i, max_slots, ctrl_reg, val_reg, reg_enable;
-	enum debug_el dbg_el = debug_exception_level(info->ctrl.privilege);
+	enum dbg_active_el dbg_el = debug_exception_level(info->ctrl.privilege);
 	u32 ctrl;
 
 	if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
@@ -537,7 +537,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
  * exception level at the register level.
  * This is used when single-stepping after a breakpoint exception.
  */
-static void toggle_bp_registers(int reg, enum debug_el el, int enable)
+static void toggle_bp_registers(int reg, enum dbg_active_el el, int enable)
 {
 	int i, max_slots, privilege;
 	u32 ctrl;