linux-kernel - [PATCH v3 2/4] mm/memory_hotplug: Drop mem_blk check from unregister_mem_sect_under

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Date:   Wed, 15 Aug 2018 16:42:17 +0200
From:   Oscar Salvador <osalvador@...hadventures.net>
To:     akpm@...ux-foundation.org
Cc:     mhocko@...e.com, vbabka@...e.cz, dan.j.williams@...el.com,
        yasu.isimatu@...il.com, jonathan.cameron@...wei.com,
        david@...hat.com, Pavel.Tatashin@...rosoft.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Oscar Salvador <osalvador@...e.de>
Subject: [PATCH v3 2/4] mm/memory_hotplug: Drop mem_blk check from unregister_mem_sect_under_nodes

From: Oscar Salvador <osalvador@...e.de>

Before calling to unregister_mem_sect_under_nodes(),
remove_memory_section() already checks if we got a valid memory_block.

No need to check that again in unregister_mem_sect_under_nodes().

If more functions start using unregister_mem_sect_under_nodes() in the
future, we can always place a WARN_ON to catch null mem_blk's so we can
safely back off.

For now, let us keep the check in remove_memory_section() since it is the
only function that uses it.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
---
 drivers/base/node.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 1ac4c36e13bb..dd3bdab230b2 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -455,10 +455,6 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
 	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
 	unsigned long pfn, sect_start_pfn, sect_end_pfn;
 
-	if (!mem_blk) {
-		NODEMASK_FREE(unlinked_nodes);
-		return -EFAULT;
-	}
 	if (!unlinked_nodes)
 		return -ENOMEM;
 	nodes_clear(*unlinked_nodes);
-- 
2.13.6