The patch titled
cpumask: add cpumask_var_t documentation
has been removed from the -mm tree. Its filename was
cpumask-add-cpumask_var_t-documentation.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cpumask: add cpumask_var_t documentation
From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
cpumask_var_t has one notable difference from cpumask_t. Add the
explanation.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Thiago Farina <tfransosi@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/cpumask.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff -puN include/linux/cpumask.h~cpumask-add-cpumask_var_t-documentation include/linux/cpumask.h
--- a/include/linux/cpumask.h~cpumask-add-cpumask_var_t-documentation
+++ a/include/linux/cpumask.h
@@ -617,6 +617,20 @@ static inline size_t cpumask_size(void)
* ... use 'tmpmask' like a normal struct cpumask * ...
*
* free_cpumask_var(tmpmask);
+ *
+ *
+ * However, one notable exception is there. alloc_cpumask_var() allocates
+ * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
+ * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
+ *
+ * cpumask_var_t tmpmask;
+ * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
+ * return -ENOMEM;
+ *
+ * var = *tmpmask;
+ *
+ * This code makes NR_CPUS length memcopy and brings to a memory corruption.
+ * cpumask_copy() provide safe copy functionality.
*/
#ifdef CONFIG_CPUMASK_OFFSTACK
typedef struct cpumask *cpumask_var_t;
_
Patches currently in -mm which might be from kosaki.motohiro@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
slab-use-numa_no_node.patch
kexec-remove-kmsg_dump_kexec.patch
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