linux-kernel - [PATCH V1] mm/damon: Modify damon_rand() macro to static inline function

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Message-Id: <7066b07ba4f89e32c5264ed1f7d71260bea8812e.1638794380.git.xhao@linux.alibaba.com>
Date:   Mon,  6 Dec 2021 20:41:29 +0800
From:   Xin Hao <xhao@...ux.alibaba.com>
To:     sj@...nel.org
Cc:     xhao@...ux.alibaba.com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH V1] mm/damon: Modify damon_rand() macro to static inline function

The damon_rand() func can not be implemented as a macro.
Example:
	damon_rand(a++, b);
The value of 'a' will be incremented twice, This is obviously
unreasonable, So there fix it.

Fixes: b9a6ac4e4ede ("mm/damon: adaptively adjust regions")
Reported-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
---
 include/linux/damon.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index c6df025d8704..bc9c8932b1e8 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -19,7 +19,10 @@
 #define DAMOS_MAX_SCORE		(99)

 /* Get a random number in [l, r) */
-#define damon_rand(l, r) (l + prandom_u32_max(r - l))
+static inline unsigned long damon_rand(unsigned long l, unsigned long r)
+{
+	return l + (r - l);
+}

 /**
  * struct damon_addr_range - Represents an address region of [@start, @end).
--
2.31.0