ACPI, APEI, GHES, Do not ratelimit fatal error printk before panic

printk is used by GHES to report hardware errors.  Normally, the
printk will be ratelimited to avoid too many hardware error reports in
kernel log.  Because there may be thousands or even millions of
corrected hardware errors during system running.

That is different for fatal hardware error, because system will go
panic as soon as possible, there will be no more than several error
records.  And these error records are valuable for system fault
diagnosis, so they should not be ratelimited.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index f703b2881153f57c9eb01b1a2da47ae45e8a4af3..f339c0f8369c6b179b23b3fc2f72db9e755fc1ed 100644 (file)
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -360,11 +360,8 @@ static void ghes_do_proc(struct ghes *ghes)
        }
 }
 
-static void ghes_print_estatus(const char *pfx, struct ghes *ghes)
+static void __ghes_print_estatus(const char *pfx, struct ghes *ghes)
 {
-       /* Not more than 2 messages every 5 seconds */
-       static DEFINE_RATELIMIT_STATE(ratelimit, 5*HZ, 2);
-
        if (pfx == NULL) {
                if (ghes_severity(ghes->estatus->error_severity) <=
                    GHES_SEV_CORRECTED)
@@ -372,12 +369,18 @@ static void ghes_print_estatus(const char *pfx, struct ghes *ghes)
                else
                        pfx = KERN_ERR HW_ERR;
        }
-       if (__ratelimit(&ratelimit)) {
-               printk(
-       "%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
-       pfx, ghes->generic->header.source_id);
-               apei_estatus_print(pfx, ghes->estatus);
-       }
+       printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
+              pfx, ghes->generic->header.source_id);
+       apei_estatus_print(pfx, ghes->estatus);
+}
+
+static void ghes_print_estatus(const char *pfx, struct ghes *ghes)
+{
+       /* Not more than 2 messages every 5 seconds */
+       static DEFINE_RATELIMIT_STATE(ratelimit, 5*HZ, 2);
+
+       if (__ratelimit(&ratelimit))
+               __ghes_print_estatus(pfx, ghes);
 }
 
 static int ghes_proc(struct ghes *ghes)
@@ -476,7 +479,7 @@ static int ghes_notify_nmi(struct notifier_block *this,
 
        if (sev_global >= GHES_SEV_PANIC) {
                oops_begin();
-               ghes_print_estatus(KERN_EMERG HW_ERR, ghes_global);
+               __ghes_print_estatus(KERN_EMERG HW_ERR, ghes_global);
                /* reboot to log the error! */
                if (panic_timeout == 0)
                        panic_timeout = ghes_panic_timeout;