RE: [PATCH 2/2] of: of_reserved_mem: mark nomap memory instead of removing

From: Rob Herring <robh+dt@kernel.org>
Sent: Saturday, June 12, 2021 1:11 AM

On Fri, Jun 11, 2021 at 7:13 AM Dong Aisheng [off-list ref]
wrote:

quoted

Since commit 86588296acbf ("fdt: Properly handle "no-map" field in the
memory region"), nomap memory is changed to call

memblock_mark_nomap()

quoted

instead of memblock_remove(). But it only changed the reserved memory
with fixed addr and size case in early_init_dt_reserve_memory_arch(),
not including the dynamical allocation by size case in
early_init_dt_alloc_reserved_memory_arch().

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org

Good practice is to Cc the people involved in referenced commits.
Adding them now. This code is a minefield so I'd like other eyes on it.

Yes, you're right. Thanks for the good suggestion.
Let's wait for their comments.

Regards
Aisheng

quoted

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 drivers/of/of_reserved_mem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/of_reserved_mem.c

b/drivers/of/of_reserved_mem.c index 367f298a83b2..ebba88395bf8

100644

quoted

--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c

@@ -42,7 +42,7 @@ static int __init

early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,

        *res_base = base;
        if (nomap)
-               return memblock_remove(base, size);
+               return memblock_mark_nomap(base, size);

        return memblock_reserve(base, size);  } @@ -276,7 +276,7 @@
void __init fdt_init_reserved_mem(void)
                                pr_info("node %s compatible matching

fail\n",

quoted

                                        rmem->name);
                                if (nomap)
-                                       memblock_add(rmem->base,

rmem->size);

quoted

+
+ memblock_clear_nomap(rmem->base, rmem->size);
                                else
                                        memblock_free(rmem->base,

rmem->size);

quoted

                        }
--
2.25.1

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