Re: [-mm][PATCH 2/4] Setup the memrlimit controller (v5)

[Andrea Righi <righi.andrea@gmail.com>]

Balbir Singh wrote:
> +static int memrlimit_cgroup_write_strategy(char *buf, unsigned long long *tmp)
> +{
> +	*tmp = memparse(buf, &buf);
> +	if (*buf != '\0')
> +		return -EINVAL;
> +
> +	*tmp = PAGE_ALIGN(*tmp);
> +	return 0;
> +}

We shouldn't use PAGE_ALIGN() here, otherwise we limit the address space
to 4GB on 32-bit architectures (that could be reasonable, because this
is a per-cgroup limit and not per-process).

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
---
 mm/memrlimitcgroup.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/memrlimitcgroup.c b/mm/memrlimitcgroup.c
index 9a03d7d..2d42ff3 100644
--- a/mm/memrlimitcgroup.c
+++ b/mm/memrlimitcgroup.c
@@ -29,6 +29,8 @@
 #include <linux/res_counter.h>
 #include <linux/memrlimitcgroup.h>
 
+#define PAGE_ALIGN64(addr) (((((addr)+PAGE_SIZE-1))>>PAGE_SHIFT)<<PAGE_SHIFT)
+
 struct cgroup_subsys memrlimit_cgroup_subsys;
 
 struct memrlimit_cgroup {
@@ -124,7 +126,7 @@ static int memrlimit_cgroup_write_strategy(char *buf, unsigned long long *tmp)
 	if (*buf != '\0')
 		return -EINVAL;
 
-	*tmp = PAGE_ALIGN(*tmp);
+	*tmp = PAGE_ALIGN64(*tmp);
 	return 0;
 }
 

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