* [PATCH v3] include/linux/nodemask.h: Use nr_node_ids (not MAX_NUMNODES) in __nodemask_pr_numnodes()
@ 2018-12-19 21:04 Waiman Long
2018-12-21 0:39 ` kbuild test robot
0 siblings, 1 reply; 2+ messages in thread
From: Waiman Long @ 2018-12-19 21:04 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-kernel, Oscar Salvador, Tejun Heo, Waiman Long
When viewing the /proc/<pid>/status file, one can see output lines like
Cpus_allowed: ffffffff,ffffffff,ffffffff
Cpus_allowed_list: 0-95
Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,0000000f
Mems_allowed_list: 0-3
The "Mems_allowed" line uses the "%*pb" format string while the
"Mems_allowed_list" line uses the "%*pbl" format string together with
the nodemask_pr_args() macro.
The "Mems_allowed" looks insane compared with the others. It is because
the nodemask_pr_args() macro uses MAX_NUMNODES as the number of nodes
to iterate. The cpumask_pr_args() macro uses nr_cpu_ids instead of
MAX_CPUS. For nodes, there is a corresponding nr_node_ids. So it makes
sense to use nr_node_ids instead to be consistent with "Cpus_allowed:".
With that change, the "Mems_allowed" line becomes sane again.
Mems_allowed: f
There are currently 10 call sites of nodemask_pr_args() in the kernel.
Of them, only cpuset_task_status_allowed() in kernel/cgroup/cpuset.c
uses the "%*pb" format string that will be affected by this change. That
cpuset function is called by proc_pid_status() only.
v3: Fix build problem with MAX_NUMNODES=1.
Signed-off-by: Waiman Long <longman@redhat.com>
---
include/linux/nodemask.h | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 5a30ad5..9e3a30d 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -98,6 +98,13 @@
typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
extern nodemask_t _unused_nodemask_arg_;
+#if MAX_NUMNODES > 1
+extern int nr_node_ids;
+extern int nr_online_nodes;
+#else
+#define nr_node_ids MAX_NUMNODES
+#endif
+
/**
* nodemask_pr_args - printf args to output a nodemask
* @maskp: nodemask to be printed
@@ -108,7 +115,7 @@
__nodemask_pr_bits(maskp)
static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m)
{
- return m ? MAX_NUMNODES : 0;
+ return m ? nr_node_ids : 0;
}
static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m)
{
@@ -444,9 +451,6 @@ static inline int next_memory_node(int nid)
return next_node(nid, node_states[N_MEMORY]);
}
-extern int nr_node_ids;
-extern int nr_online_nodes;
-
static inline void node_set_online(int nid)
{
node_set_state(nid, N_ONLINE);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v3] include/linux/nodemask.h: Use nr_node_ids (not MAX_NUMNODES) in __nodemask_pr_numnodes()
2018-12-19 21:04 [PATCH v3] include/linux/nodemask.h: Use nr_node_ids (not MAX_NUMNODES) in __nodemask_pr_numnodes() Waiman Long
@ 2018-12-21 0:39 ` kbuild test robot
0 siblings, 0 replies; 2+ messages in thread
From: kbuild test robot @ 2018-12-21 0:39 UTC (permalink / raw)
To: Waiman Long
Cc: kbuild-all, Andrew Morton, linux-kernel, Oscar Salvador,
Tejun Heo, Waiman Long
[-- Attachment #1: Type: text/plain, Size: 2323 bytes --]
Hi Waiman,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v4.20-rc7 next-20181220]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Waiman-Long/include-linux-nodemask-h-Use-nr_node_ids-not-MAX_NUMNODES-in-__nodemask_pr_numnodes/20181221-082352
config: riscv-tinyconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 8.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=8.1.0 make.cross ARCH=riscv
All warnings (new ones prefixed by >>):
In file included from include/linux/sched.h:22,
from arch/riscv/kernel/asm-offsets.c:18:
>> include/linux/nodemask.h:492: warning: "nr_node_ids" redefined
#define nr_node_ids 1
include/linux/nodemask.h:105: note: this is the location of the previous definition
#define nr_node_ids MAX_NUMNODES
vim +/nr_node_ids +492 include/linux/nodemask.h
13808910 Christoph Lameter 2007-10-16 485
13808910 Christoph Lameter 2007-10-16 486 #define for_each_node_state(node, __state) \
13808910 Christoph Lameter 2007-10-16 487 for ( (node) = 0; (node) == 0; (node) = 1)
13808910 Christoph Lameter 2007-10-16 488
8357f869 KAMEZAWA Hiroyuki 2006-03-27 489 #define first_online_node 0
8d060bf4 David Rientjes 2014-08-06 490 #define first_memory_node 0
8357f869 KAMEZAWA Hiroyuki 2006-03-27 491 #define next_online_node(nid) (MAX_NUMNODES)
74c7aa8b Christoph Lameter 2007-02-20 @492 #define nr_node_ids 1
62bc62a8 Christoph Lameter 2009-06-16 493 #define nr_online_nodes 1
13808910 Christoph Lameter 2007-10-16 494
:::::: The code at line 492 was first introduced by commit
:::::: 74c7aa8b8581e0ba8d6d17c623b9279aaabbb0cf [PATCH] Replace highest_possible_node_id() with nr_node_ids
:::::: TO: Christoph Lameter <clameter@sgi.com>
:::::: CC: Linus Torvalds <torvalds@woody.linux-foundation.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 4416 bytes --]
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2018-12-19 21:04 [PATCH v3] include/linux/nodemask.h: Use nr_node_ids (not MAX_NUMNODES) in __nodemask_pr_numnodes() Waiman Long
2018-12-21 0:39 ` kbuild test robot
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