ARM: hw_breakpoint: reduce the number of WARN_ONCE invocations

The ARM hw_breakpoint backend is currently a bit too noisy when things
start to go awry.

This patch removes a couple of over-zealous WARN_ONCE invocations and
replaces then with pr_warnings instead.

Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index 64ac5c6..5a46225 100644 (file)
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -136,10 +136,11 @@ static u8 get_debug_arch(void)
        u32 didr;
 
        /* Do we implement the extended CPUID interface? */
-       if (WARN_ONCE((((read_cpuid_id() >> 16) & 0xf) != 0xf),
-           "CPUID feature registers not supported. "
-           "Assuming v6 debug is present.\n"))
+       if (((read_cpuid_id() >> 16) & 0xf) != 0xf) {
+               pr_warning("CPUID feature registers not supported. "
+                          "Assuming v6 debug is present.\n");
                return ARM_DEBUG_ARCH_V6;
+       }
 
        ARM_DBG_READ(c0, 0, didr);
        return (didr >> 16) & 0xf;
@@ -231,7 +232,7 @@ static int enable_monitor_mode(void)
 
        /* Ensure that halting mode is disabled. */
        if (WARN_ONCE(dscr & ARM_DSCR_HDBGEN,
-                       "halting debug mode enabled. Unable to access hardware resources.\n")) {
+               "halting debug mode enabled. Unable to access hardware resources.\n")) {
                ret = -EPERM;
                goto out;
        }
@@ -626,10 +627,9 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
         * we can use the mismatch feature as a poor-man's hardware
         * single-step, but this only works for per-task breakpoints.
         */
-       if (WARN_ONCE(!bp->overflow_handler &&
-               (arch_check_bp_in_kernelspace(bp) || !core_has_mismatch_brps()
-                || !bp->hw.bp_target),
-                       "overflow handler required but none found\n")) {
+       if (!bp->overflow_handler && (arch_check_bp_in_kernelspace(bp) ||
+           !core_has_mismatch_brps() || !bp->hw.bp_target)) {
+               pr_warning("overflow handler required but none found\n");
                ret = -EINVAL;
        }
 out: