linux-kernel - [PATCH v2 3/3] of/fdt: Mark initial_boot_params as __ro_after

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Date:   Tue, 14 May 2019 13:40:53 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: [PATCH v2 3/3] of/fdt: Mark initial_boot_params as __ro_after_init

The FDT pointer, i.e. initial_boot_params, shouldn't be changed after
init. It's only set by boot code and then the only user of the FDT is
the raw sysfs reading API. Mark this pointer with __ro_after_init so
that the pointer can't be changed after init.

Cc: Hsin-Yi Wang <hsinyi@...omium.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/of/fdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 93414b89735f..f131a1b8588b 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -516,7 +516,7 @@ EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
 int __initdata dt_root_addr_cells;
 int __initdata dt_root_size_cells;
 
-void *initial_boot_params;
+void *initial_boot_params __ro_after_init;
 
 #ifdef CONFIG_OF_EARLY_FLATTREE
 
-- 
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