linux-kernel - [PATCH] mm: Change global memory state symbols to GPL-only

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Date:	Sun, 16 Aug 2015 01:42:27 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: Change global memory state symbols to GPL-only

Proprietary modules should not be able to touch vm_stat or participate
in shrinking.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 mm/vmscan.c | 4 ++--
 mm/vmstat.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8286938..e6e7449 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -247,7 +247,7 @@ int register_shrinker(struct shrinker *shrinker)
 	up_write(&shrinker_rwsem);
 	return 0;
 }
-EXPORT_SYMBOL(register_shrinker);
+EXPORT_SYMBOL_GPL(register_shrinker);
 
 /*
  * Remove one
@@ -259,7 +259,7 @@ void unregister_shrinker(struct shrinker *shrinker)
 	up_write(&shrinker_rwsem);
 	kfree(shrinker->nr_deferred);
 }
-EXPORT_SYMBOL(unregister_shrinker);
+EXPORT_SYMBOL_GPL(unregister_shrinker);
 
 #define SHRINK_BATCH 128
 
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 4f5cd97..6d3f8f4 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -87,7 +87,7 @@ void vm_events_fold_cpu(int cpu)
  * vm_stat contains the global counters
  */
 atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS] __cacheline_aligned_in_smp;
-EXPORT_SYMBOL(vm_stat);
+EXPORT_SYMBOL_GPL(vm_stat);
 
 #ifdef CONFIG_SMP
 
-- 
Ben Hutchings
[W]e found...that it wasn't as easy to get programs right as we had thought.
... I realized that a large part of my life from then on was going to be spent
in finding mistakes in my own programs. - Maurice Wilkes, 1949


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