arm64/mm: Poison initmem while freeing with free_reserved_area()

Platform implementation for free_initmem() should poison the memory while
freeing it up. Hence pass across POISON_FREE_INITMEM while calling into
free_reserved_area(). The same is being followed in the generic fallback
for free_initmem() and some other platforms overriding it.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 87a0e3b..7c225d0 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -571,7 +571,7 @@ void free_initmem(void)
 {
        free_reserved_area(lm_alias(__init_begin),
                           lm_alias(__init_end),
-                          0, "unused kernel");
+                          POISON_FREE_INITMEM, "unused kernel");
        /*
         * Unmap the __init region but leave the VM area in place. This
         * prevents the region from being reused for kernel modules, which