* [PATCH V2] mm/damon: Modify damon_rand() macro to static inline function
@ 2021-12-06 12:52 Xin Hao
2021-12-06 12:57 ` SeongJae Park
0 siblings, 1 reply; 2+ messages in thread
From: Xin Hao @ 2021-12-06 12:52 UTC (permalink / raw)
To: sj; +Cc: xhao, akpm, linux-mm, linux-kernel
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@linux-foundation.org>
Signed-off-by: Xin Hao <xhao@linux.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..a58046cd45e6 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 + prandom_u32_max(r - l);
+}
/**
* struct damon_addr_range - Represents an address region of [@start, @end).
--
2.31.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH V2] mm/damon: Modify damon_rand() macro to static inline function
2021-12-06 12:52 [PATCH V2] mm/damon: Modify damon_rand() macro to static inline function Xin Hao
@ 2021-12-06 12:57 ` SeongJae Park
0 siblings, 0 replies; 2+ messages in thread
From: SeongJae Park @ 2021-12-06 12:57 UTC (permalink / raw)
To: Xin Hao; +Cc: sj, akpm, linux-mm, linux-kernel
On Mon, 6 Dec 2021 20:52:43 +0800 Xin Hao <xhao@linux.alibaba.com> wrote:
> 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@linux-foundation.org>
> Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Thanks,
SJ
> ---
> 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..a58046cd45e6 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 + prandom_u32_max(r - l);
> +}
>
> /**
> * struct damon_addr_range - Represents an address region of [@start, @end).
> --
> 2.31.0
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-12-06 12:57 ` SeongJae Park
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