[PATCH v2 5/8] powerpc/mm: print warning in arch_remove_linear_mapping()

[David Hildenbrand]

Let's print a warning similar to in arch_add_linear_mapping() instead of
WARN_ON_ONCE() and eventually crashing the kernel.

Reviewed-by: Oscar Salvador <osalvador at suse.de>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Rashmica Gupta <rashmica.g at gmail.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Mike Rapoport <rppt at kernel.org>
Cc: Michal Hocko <mhocko at suse.com>
Cc: Oscar Salvador <osalvador at suse.de>
Cc: Wei Yang <richard.weiyang at linux.alibaba.com>
Signed-off-by: David Hildenbrand <david at redhat.com>
---
 arch/powerpc/mm/mem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index ca5c4b54c366..c5755b9efb64 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -150,7 +150,9 @@ void __ref arch_remove_linear_mapping(u64 start, u64 size)
 	mutex_lock(&linear_mapping_mutex);
 	ret = remove_section_mapping(start, start + size);
 	mutex_unlock(&linear_mapping_mutex);
-	WARN_ON_ONCE(ret);
+	if (ret)
+		pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n",
+			start, start + size, ret);
 
 	/* Ensure all vmalloc mappings are flushed in case they also
 	 * hit that section of memory
-- 
2.26.2