The patch titled
in_atomic(): document why it is unsuitable for general use
has been added to the -mm tree. Its filename is
in_atomic-document-why-it-is-unsuitable-for-general-use.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: in_atomic(): document why it is unsuitable for general use
From: Jonathan Corbet <corbet@xxxxxxx>
Discourage people from inappropriately using in_atomic()
Signed-off-by: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/hardirq.h | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN include/linux/hardirq.h~in_atomic-document-why-it-is-unsuitable-for-general-use include/linux/hardirq.h
--- a/include/linux/hardirq.h~in_atomic-document-why-it-is-unsuitable-for-general-use
+++ a/include/linux/hardirq.h
@@ -72,6 +72,13 @@
#define in_softirq() (softirq_count())
#define in_interrupt() (irq_count())
+/*
+ * Are we running in atomic context? WARNING: this macro cannot
+ * always detect atomic context; in particular, it cannot know about
+ * held spinlocks in non-preemptible kernels. Thus it should not be
+ * used in the general case to determine whether sleeping is possible.
+ * Do not use in_atomic() in driver code.
+ */
#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0)
#ifdef CONFIG_PREEMPT
_
Patches currently in -mm which might be from corbet@xxxxxxx are
smackfs-remove-redundant-lock-fix-openo_rdwr.patch
documentation-patch-tags-one-more-time.patch
in_atomic-document-why-it-is-unsuitable-for-general-use.patch
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