From: Oleg Drokin <gr...@linuxhacker.ru>
When we are doing things like cpumask_copy, and CONFIG_CPUMASK_OFFSTACK
is set, we only copy actual number of bits equal to number of CPUs
we have. But underlying allocations got NR_CPUS = 8192, so
if the cpumask is allocated on the stack or has other prefilled values
there's a lot of garbage left that might become exposed as more CPUs are
added into the system.
The patch converts such whole-mask functions:
cpumask_setall, cpumask_clear, cpumask_copy
to operate on the whole NR_CPUS value.
Signed-off-by: Oleg Drokin <gr...@linuxhacker.ru>
---
include/linux/cpumask.h | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index f0599e1..28a8bb3 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -324,21 +324,21 @@ static inline int cpumask_test_and_clear_cpu(int cpu,
struct cpumask *cpumask)
}
/**
- * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
+ * cpumask_setall - set all cpus (< NR_CPUS) in a cpumask
* @dstp: the cpumask pointer
*/
static inline void cpumask_setall(struct cpumask *dstp)
{
- bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
+ bitmap_fill(cpumask_bits(dstp), NR_CPUS);
}
/**
- * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
+ * cpumask_clear - clear all cpus (< NR_CPUS) in a cpumask
* @dstp: the cpumask pointer
*/
static inline void cpumask_clear(struct cpumask *dstp)
{
- bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
+ bitmap_zero(cpumask_bits(dstp), NR_CPUS);
}
/**
@@ -470,7 +470,7 @@ static inline bool cpumask_full(const struct cpumask *srcp)
/**
* cpumask_weight - Count of bits in *srcp
- * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
+ * @srcp: the cpumask to count bits (< NR_CPUS) in.
*/
static inline unsigned int cpumask_weight(const struct cpumask *srcp)
{
@@ -511,7 +511,7 @@ static inline void cpumask_shift_left(struct cpumask *dstp,
static inline void cpumask_copy(struct cpumask *dstp,
const struct cpumask *srcp)
{
- bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
+ bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), NR_CPUS);
}
/**
--
2.1.0
--
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