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SubjectRe: [PATCH v2] x86/mm: Remove the redundant conditional check
On Wed, Mar 11, 2020 at 09:18:23AM +0800, Baoquan He wrote:
>In commit f70029bbaacb ("mm, memory_hotplug: drop CONFIG_MOVABLE_NODE"),
>the dependency on CONFIG_MOVABLE_NODE was removed for N_MEMORY. Before
>commit f70029bbaacb, CONFIG_HIGHMEM && !CONFIG_MOVABLE_NODE could make
>(N_MEMORY == N_NORMAL_MEMORY) be true. After commit f70029bbaacb, N_MEMORY
>doesn't have any chance to be equal to N_NORMAL_MEMORY. So the conditional
>check in paging_init() doesn't make sense any more. Let's remove it.
>
>Signed-off-by: Baoquan He <bhe@redhat.com>

The change looks good. While I have one question, we set default value for
N_HIGH_MEMORY. Why we don't clear this too?

Reviewed-by: Wei Yang <richard.weiyang@gmail.com>

>---
>v1->v2:
> Update patch log to make the description clearer per Michal's
> suggestion.
>
> arch/x86/mm/init_64.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
>diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
>index abbdecb75fad..0a14711d3a93 100644
>--- a/arch/x86/mm/init_64.c
>+++ b/arch/x86/mm/init_64.c
>@@ -818,8 +818,7 @@ void __init paging_init(void)
> * will not set it back.
> */
> node_clear_state(0, N_MEMORY);
>- if (N_MEMORY != N_NORMAL_MEMORY)
>- node_clear_state(0, N_NORMAL_MEMORY);
>+ node_clear_state(0, N_NORMAL_MEMORY);
>
> zone_sizes_init();
> }
>--
>2.17.2

--
Wei Yang
Help you, Help me

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