Subject: [PATCH v1 2/4] powerpc/mm: print warning in arch_remove_linear_mapping()

From: David Hildenbrand <[email-masked]>
Date: Thu, 29 Oct 2020 17:27:16 +0100

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

Cc: Michael Ellerman <[email-masked]>
Cc: Benjamin Herrenschmidt <[email-masked]>
Cc: Paul Mackerras <[email-masked]>
Cc: Rashmica Gupta <[email-masked]>
Cc: Andrew Morton <[email-masked]>
Cc: Mike Rapoport <[email-masked]>
Cc: Michal Hocko <[email-masked]>
Cc: Oscar Salvador <[email-masked]>
Cc: Wei Yang <[email-masked]>
Signed-off-by: David Hildenbrand <[email-masked]>
---
 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 8a86d81f8df0..685028451dd2 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -145,7 +145,9 @@ void __ref arch_remove_linear_mapping(u64 start, u64 size)
 	flush_dcache_range_chunked(start, start + size, FLUSH_CHUNK_SIZE);
 
 	ret = remove_section_mapping(start, start + size);
-	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