linux-kernel - [PATCH v2 1/1] mm: move bad zone checking in gfp

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Message-Id: <20240905104808.27528-1-wangyibo@uniontech.com>
Date: Thu,  5 Sep 2024 18:48:08 +0800
From: Wang Yibo <lcnwed@...il.com>
To: david@...hat.com
Cc: akpm@...ux-foundation.org,
	lcnwed@...il.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	trivial@...nel.org,
	wangyibo@...ontech.com
Subject: [PATCH v2 1/1] mm: move bad zone checking in gfp_zone()

When flags in gfp_zone() has an error combination,
VM_BUG_ON() should first know it before use it.

Signed-off-by: Wang Yibo <wangyibo@...ontech.com>
---
 include/linux/gfp.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index f53f76e0b17e..ca61b2440ab3 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -133,10 +133,11 @@ static inline enum zone_type gfp_zone(gfp_t flags)
 {
 	enum zone_type z;
 	int bit = (__force int) (flags & GFP_ZONEMASK);
+	VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
 
 	z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) &
 					 ((1 << GFP_ZONES_SHIFT) - 1);
-	VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
+
 	return z;
 }
 
-- 
2.20.1