Since I butchered this I figured better to make sure we have testcases
for this now. Since we only have a locking context for __GFP_FS that's
the only thing we're testing right now.
Acked-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Cc: linux-fsde...@vger.kernel.org
Cc: Dave Chinner <da...@fromorbit.com>
Cc: Qian Cai <c...@lca.pw>
Cc: linux-...@vger.kernel.org
Cc: Thomas Hellström (Intel) <thomas...@shipmail.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Jason Gunthorpe <j...@mellanox.com>
Cc: linux...@kvack.org
Cc: linux-r...@vger.kernel.org
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Christian König <christian.koe...@amd.com>
Cc: "Matthew Wilcox (Oracle)" <wi...@infradead.org>
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Will Deacon <w...@kernel.org>
Cc: linux-kernel@vger.kernel.org
---
lib/locking-selftest.c | 47 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index a899b3f0e2e5..ad47c3358e30 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -15,6 +15,7 @@
#include <linux/mutex.h>
#include <linux/ww_mutex.h>
#include <linux/sched.h>
+#include <linux/sched/mm.h>
#include <linux/delay.h>
#include <linux/lockdep.h>
#include <linux/spinlock.h>
@@ -2357,6 +2358,50 @@ static void queued_read_lock_tests(void)
pr_cont("\n");
}
+static void fs_reclaim_correct_nesting(void)
+{
+ fs_reclaim_acquire(GFP_KERNEL);
+ might_alloc(GFP_NOFS);
+ fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_wrong_nesting(void)
+{
+ fs_reclaim_acquire(GFP_KERNEL);
+ might_alloc(GFP_KERNEL);
+ fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_protected_nesting(void)
+{
+ unsigned int flags;
+
+ fs_reclaim_acquire(GFP_KERNEL);
+ flags = memalloc_nofs_save();
+ might_alloc(GFP_KERNEL);
+ memalloc_nofs_restore(flags);
+ fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_tests(void)
+{
+ printk(" --------------------\n");
+ printk(" | fs_reclaim tests |\n");
+ printk(" --------------------\n");
+
+ print_testname("correct nesting");
+ dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
+ pr_cont("\n");
+
+ print_testname("wrong nesting");
+ dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
+ pr_cont("\n");
+
+ print_testname("protected nesting");
+ dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
+ pr_cont("\n");
+}
+
void locking_selftest(void)
{
/*
@@ -2478,6 +2523,8 @@ void locking_selftest(void)
if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
queued_read_lock_tests();
+ fs_reclaim_tests();
+
if (unexpected_testcase_failures) {
printk("-----------------------------------------------------------------\n");
debug_locks = 0;
--
2.29.2
