1 files changed, 106 insertions, 0 deletions
diff --git a/scripts/coccinelle/locks/call_kern.cocci b/scripts/coccinelle/locks/call_kern.cocci
new file mode 100644
index 000000000..3720f86d6
--- /dev/null
+++ b/scripts/coccinelle/locks/call_kern.cocci
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/// Find functions that refer to GFP_KERNEL but are called with locks held.
+//# The proposed change of converting the GFP_KERNEL is not necessarily the
+//# correct one.  It may be desired to unlock the lock, or to not call the
+//# function under the lock in the first place.
+///
+// Confidence: Moderate
+// Copyright: (C) 2012 Nicolas Palix.
+// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6.
+// Copyright: (C) 2012 Gilles Muller, INRIA/LiP6.
+// URL: https://coccinelle.gitlabpages.inria.fr/website
+// Comments:
+// Options: --no-includes --include-headers
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@gfp exists@
+identifier fn;
+position p;
+@@
+
+fn(...) {
+ ... when != read_unlock_irq(...)
+     when != write_unlock_irq(...)
+     when != read_unlock_irqrestore(...)
+     when != write_unlock_irqrestore(...)
+     when != spin_unlock(...)
+     when != spin_unlock_irq(...)
+     when != spin_unlock_irqrestore(...)
+     when != local_irq_enable(...)
+     when any
+ GFP_KERNEL@p
+ ... when any
+}
+
+@locked exists@
+identifier gfp.fn;
+position p1,p2;
+@@
+
+(
+read_lock_irq@p1
+|
+write_lock_irq@p1
+|
+read_lock_irqsave@p1
+|
+write_lock_irqsave@p1
+|
+spin_lock@p1
+|
+spin_trylock@p1
+|
+spin_lock_irq@p1
+|
+spin_lock_irqsave@p1
+|
+local_irq_disable@p1
+)
+ (...)
+...  when != read_unlock_irq(...)
+     when != write_unlock_irq(...)
+     when != read_unlock_irqrestore(...)
+     when != write_unlock_irqrestore(...)
+     when != spin_unlock(...)
+     when != spin_unlock_irq(...)
+     when != spin_unlock_irqrestore(...)
+     when != local_irq_enable(...)
+fn@p2(...)
+
+@depends on locked && patch@
+position gfp.p;
+@@
+
+- GFP_KERNEL@p
++ GFP_ATOMIC
+
+@depends on locked && !patch@
+position gfp.p;
+@@
+
+* GFP_KERNEL@p
+
+@script:python depends on !patch && org@
+p << gfp.p;
+fn << gfp.fn;
+p1 << locked.p1;
+p2 << locked.p2;
+@@
+
+cocci.print_main("lock",p1)
+cocci.print_secs("call",p2)
+cocci.print_secs("GFP_KERNEL",p)
+
+@script:python depends on !patch && report@
+p << gfp.p;
+fn << gfp.fn;
+p1 << locked.p1;
+p2 << locked.p2;
+@@
+
+msg = "ERROR: function %s called on line %s inside lock on line %s but uses GFP_KERNEL" % (fn,p2[0].line,p1[0].line)
+coccilib.report.print_report(p[0], msg)