* [PATCH] mm: memcontrol: Use int for event/state parameter in several functions
@ 2017-07-27 21:10 Matthias Kaehlcke
2017-07-28 6:58 ` Michal Hocko
2017-07-28 18:23 ` Matthias Kaehlcke
0 siblings, 2 replies; 4+ messages in thread
From: Matthias Kaehlcke @ 2017-07-27 21:10 UTC (permalink / raw)
To: Johannes Weiner, Michal Hocko, Vladimir Davydov, Andrew Morton
Cc: linux-kernel, cgroups, linux-mm, Doug Anderson, Matthias Kaehlcke
Several functions use an enum type as parameter for an event/state,
but are called in some locations with an argument of a different enum
type. Adjust the interface of these functions to reality by changing the
parameter to int.
This fixes a ton of enum-conversion warnings that are generated when
building the kernel with clang.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
include/linux/memcontrol.h | 20 ++++++++++++--------
mm/memcontrol.c | 4 +++-
2 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 3914e3dd6168..80edbc04361e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -487,8 +487,9 @@ extern int do_swap_account;
void lock_page_memcg(struct page *page);
void unlock_page_memcg(struct page *page);
+/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
- enum memcg_stat_item idx)
+ int idx)
{
long val = 0;
int cpu;
@@ -502,15 +503,17 @@ static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
return val;
}
+/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline void __mod_memcg_state(struct mem_cgroup *memcg,
- enum memcg_stat_item idx, int val)
+ int idx, int val)
{
if (!mem_cgroup_disabled())
__this_cpu_add(memcg->stat->count[idx], val);
}
+/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline void mod_memcg_state(struct mem_cgroup *memcg,
- enum memcg_stat_item idx, int val)
+ int idx, int val)
{
if (!mem_cgroup_disabled())
this_cpu_add(memcg->stat->count[idx], val);
@@ -631,8 +634,9 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
this_cpu_add(memcg->stat->events[idx], count);
}
+/* idx can be of type enum memcg_stat_item or node_stat_item */
static inline void count_memcg_page_event(struct page *page,
- enum memcg_stat_item idx)
+ int idx)
{
if (page->mem_cgroup)
count_memcg_events(page->mem_cgroup, idx, 1);
@@ -840,19 +844,19 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
}
static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
- enum memcg_stat_item idx)
+ int idx)
{
return 0;
}
static inline void __mod_memcg_state(struct mem_cgroup *memcg,
- enum memcg_stat_item idx,
+ int idx,
int nr)
{
}
static inline void mod_memcg_state(struct mem_cgroup *memcg,
- enum memcg_stat_item idx,
+ int idx,
int nr)
{
}
@@ -918,7 +922,7 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
}
static inline void count_memcg_page_event(struct page *page,
- enum memcg_stat_item idx)
+ int idx)
{
}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3df3c04d73ab..460130d2a796 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -550,10 +550,12 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
* value, and reading all cpu value can be performance bottleneck in some
* common workload, threshold and synchronization as vmstat[] should be
* implemented.
+ *
+ * The parameter idx can be of type enum memcg_event_item or vm_event_item.
*/
static unsigned long memcg_sum_events(struct mem_cgroup *memcg,
- enum memcg_event_item event)
+ int event)
{
unsigned long val = 0;
int cpu;
--
2.14.0.rc0.400.g1c36432dff-goog
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* Re: [PATCH] mm: memcontrol: Use int for event/state parameter in several functions
2017-07-27 21:10 [PATCH] mm: memcontrol: Use int for event/state parameter in several functions Matthias Kaehlcke
@ 2017-07-28 6:58 ` Michal Hocko
2017-07-28 18:23 ` Matthias Kaehlcke
1 sibling, 0 replies; 4+ messages in thread
From: Michal Hocko @ 2017-07-28 6:58 UTC (permalink / raw)
To: Matthias Kaehlcke
Cc: Johannes Weiner, Vladimir Davydov, Andrew Morton, linux-kernel,
cgroups, linux-mm, Doug Anderson
On Thu 27-07-17 14:10:04, Matthias Kaehlcke wrote:
> Several functions use an enum type as parameter for an event/state,
> but are called in some locations with an argument of a different enum
> type. Adjust the interface of these functions to reality by changing the
> parameter to int.
enums are mostly for documentation purposes. Using defines would be
possible but less elegant. If for anything else then things like
MEMCG_NR_STAT.
> This fixes a ton of enum-conversion warnings that are generated when
> building the kernel with clang.
>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Thanks!
> ---
> include/linux/memcontrol.h | 20 ++++++++++++--------
> mm/memcontrol.c | 4 +++-
> 2 files changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 3914e3dd6168..80edbc04361e 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -487,8 +487,9 @@ extern int do_swap_account;
> void lock_page_memcg(struct page *page);
> void unlock_page_memcg(struct page *page);
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx)
> + int idx)
> {
> long val = 0;
> int cpu;
> @@ -502,15 +503,17 @@ static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
> return val;
> }
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void __mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx, int val)
> + int idx, int val)
> {
> if (!mem_cgroup_disabled())
> __this_cpu_add(memcg->stat->count[idx], val);
> }
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx, int val)
> + int idx, int val)
> {
> if (!mem_cgroup_disabled())
> this_cpu_add(memcg->stat->count[idx], val);
> @@ -631,8 +634,9 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
> this_cpu_add(memcg->stat->events[idx], count);
> }
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void count_memcg_page_event(struct page *page,
> - enum memcg_stat_item idx)
> + int idx)
> {
> if (page->mem_cgroup)
> count_memcg_events(page->mem_cgroup, idx, 1);
> @@ -840,19 +844,19 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
> }
>
> static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx)
> + int idx)
> {
> return 0;
> }
>
> static inline void __mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx,
> + int idx,
> int nr)
> {
> }
>
> static inline void mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx,
> + int idx,
> int nr)
> {
> }
> @@ -918,7 +922,7 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
> }
>
> static inline void count_memcg_page_event(struct page *page,
> - enum memcg_stat_item idx)
> + int idx)
> {
> }
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3df3c04d73ab..460130d2a796 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -550,10 +550,12 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
> * value, and reading all cpu value can be performance bottleneck in some
> * common workload, threshold and synchronization as vmstat[] should be
> * implemented.
> + *
> + * The parameter idx can be of type enum memcg_event_item or vm_event_item.
> */
>
> static unsigned long memcg_sum_events(struct mem_cgroup *memcg,
> - enum memcg_event_item event)
> + int event)
> {
> unsigned long val = 0;
> int cpu;
> --
> 2.14.0.rc0.400.g1c36432dff-goog
--
Michal Hocko
SUSE Labs
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] mm: memcontrol: Use int for event/state parameter in several functions
2017-07-27 21:10 [PATCH] mm: memcontrol: Use int for event/state parameter in several functions Matthias Kaehlcke
2017-07-28 6:58 ` Michal Hocko
@ 2017-07-28 18:23 ` Matthias Kaehlcke
2017-07-28 19:52 ` Johannes Weiner
1 sibling, 1 reply; 4+ messages in thread
From: Matthias Kaehlcke @ 2017-07-28 18:23 UTC (permalink / raw)
To: Johannes Weiner, Michal Hocko, Vladimir Davydov, Andrew Morton
Cc: linux-kernel, cgroups, linux-mm, Doug Anderson
El Thu, Jul 27, 2017 at 02:10:04PM -0700 Matthias Kaehlcke ha dit:
> Several functions use an enum type as parameter for an event/state,
> but are called in some locations with an argument of a different enum
> type. Adjust the interface of these functions to reality by changing the
> parameter to int.
>
> This fixes a ton of enum-conversion warnings that are generated when
> building the kernel with clang.
While building for another target with a different configuration I
noticed that inc/dec/mod_memcg_page_state() are also called with a
conflicting enum type. Changing the parameter type for these functions
also would make the API more consistent, with the current patch there
is a somewhat odd mix of related functions, with some receiving an
enum and others an int.
Depending on your preference I can send a v3 of this patch or a
separate patch to address the remaining functions (since this patch
has already been added to -mm).
> ---
> include/linux/memcontrol.h | 20 ++++++++++++--------
> mm/memcontrol.c | 4 +++-
> 2 files changed, 15 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 3914e3dd6168..80edbc04361e 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -487,8 +487,9 @@ extern int do_swap_account;
> void lock_page_memcg(struct page *page);
> void unlock_page_memcg(struct page *page);
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx)
> + int idx)
> {
> long val = 0;
> int cpu;
> @@ -502,15 +503,17 @@ static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
> return val;
> }
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void __mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx, int val)
> + int idx, int val)
> {
> if (!mem_cgroup_disabled())
> __this_cpu_add(memcg->stat->count[idx], val);
> }
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx, int val)
> + int idx, int val)
> {
> if (!mem_cgroup_disabled())
> this_cpu_add(memcg->stat->count[idx], val);
> @@ -631,8 +634,9 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
> this_cpu_add(memcg->stat->events[idx], count);
> }
>
> +/* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void count_memcg_page_event(struct page *page,
> - enum memcg_stat_item idx)
> + int idx)
> {
> if (page->mem_cgroup)
> count_memcg_events(page->mem_cgroup, idx, 1);
> @@ -840,19 +844,19 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
> }
>
> static inline unsigned long memcg_page_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx)
> + int idx)
> {
> return 0;
> }
>
> static inline void __mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx,
> + int idx,
> int nr)
> {
> }
>
> static inline void mod_memcg_state(struct mem_cgroup *memcg,
> - enum memcg_stat_item idx,
> + int idx,
> int nr)
> {
> }
> @@ -918,7 +922,7 @@ static inline void count_memcg_events(struct mem_cgroup *memcg,
> }
>
> static inline void count_memcg_page_event(struct page *page,
> - enum memcg_stat_item idx)
> + int idx)
> {
> }
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3df3c04d73ab..460130d2a796 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -550,10 +550,12 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
> * value, and reading all cpu value can be performance bottleneck in some
> * common workload, threshold and synchronization as vmstat[] should be
> * implemented.
> + *
> + * The parameter idx can be of type enum memcg_event_item or vm_event_item.
> */
>
> static unsigned long memcg_sum_events(struct mem_cgroup *memcg,
> - enum memcg_event_item event)
> + int event)
> {
> unsigned long val = 0;
> int cpu;
--
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* Re: [PATCH] mm: memcontrol: Use int for event/state parameter in several functions
2017-07-28 18:23 ` Matthias Kaehlcke
@ 2017-07-28 19:52 ` Johannes Weiner
0 siblings, 0 replies; 4+ messages in thread
From: Johannes Weiner @ 2017-07-28 19:52 UTC (permalink / raw)
To: Matthias Kaehlcke
Cc: Michal Hocko, Vladimir Davydov, Andrew Morton, linux-kernel,
cgroups, linux-mm, Doug Anderson
On Fri, Jul 28, 2017 at 11:23:54AM -0700, Matthias Kaehlcke wrote:
> El Thu, Jul 27, 2017 at 02:10:04PM -0700 Matthias Kaehlcke ha dit:
>
> > Several functions use an enum type as parameter for an event/state,
> > but are called in some locations with an argument of a different enum
> > type. Adjust the interface of these functions to reality by changing the
> > parameter to int.
> >
> > This fixes a ton of enum-conversion warnings that are generated when
> > building the kernel with clang.
Thanks for fixing this, Matthias.
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> While building for another target with a different configuration I
> noticed that inc/dec/mod_memcg_page_state() are also called with a
> conflicting enum type. Changing the parameter type for these functions
> also would make the API more consistent, with the current patch there
> is a somewhat odd mix of related functions, with some receiving an
> enum and others an int.
>
> Depending on your preference I can send a v3 of this patch or a
> separate patch to address the remaining functions (since this patch
> has already been added to -mm).
Since it's the exact same rationale for the other functions, it would
make sense to me to do a v3 that includes the remaining sites.
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2017-07-27 21:10 [PATCH] mm: memcontrol: Use int for event/state parameter in several functions Matthias Kaehlcke
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