blob: 9d88e4dc28a921c6256886e3f9692d0caee6b6b8 [file] [log] [blame]
From 1a71a3ebf9c164406278f45703d75837be17648b Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Date: Thu, 11 Jul 2019 20:28:14 +0530
Subject: [PATCH] powerpc/book3s/mm: Update Oops message to print the correct
translation in use
commit d7e02f7b7991dbe14a2acfb0e53d675cd149001c upstream.
Avoids confusion when printing Oops message like below
Faulting instruction address: 0xc00000000008bdb4
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
This was because we never clear the MMU_FTR_HPTE_TABLE feature flag
even if we run with radix translation. It was discussed that we should
look at this feature flag as an indication of the capability to run
hash translation and we should not clear the flag even if we run in
radix translation. All the code paths check for radix_enabled() check and
if found true consider we are running with radix translation. Follow the
same sequence for finding the MMU translation string to be used in Oops
message.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190711145814.17970-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index c8ea3a253b81..88e1c6892648 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -250,15 +250,22 @@ static void oops_end(unsigned long flags, struct pt_regs *regs,
}
NOKPROBE_SYMBOL(oops_end);
+static char *get_mmu_str(void)
+{
+ if (early_radix_enabled())
+ return " MMU=Radix";
+ if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE))
+ return " MMU=Hash";
+ return "";
+}
+
static int __die(const char *str, struct pt_regs *regs, long err)
{
printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
- printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s%s %s\n",
+ printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s %s\n",
IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN) ? "LE" : "BE",
- PAGE_SIZE / 1024,
- early_radix_enabled() ? " MMU=Radix" : "",
- early_mmu_has_feature(MMU_FTR_HPTE_TABLE) ? " MMU=Hash" : "",
+ PAGE_SIZE / 1024, get_mmu_str(),
IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
IS_ENABLED(CONFIG_SMP) ? (" NR_CPUS=" __stringify(NR_CPUS)) : "",
--
2.7.4