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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-01-01 00:42:30 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-01-01 00:42:30 +0100 |
| commit | 2a53008033189ed09bfe241c6b33811ba4ce980d (patch) | |
| tree | 86dcdacdd7fbaf671f2487b7a05352aa672fecc1 /kernel/rcutree_trace.c | |
| parent | cpumask: replace for_each_cpu_mask_nr with for_each_cpu in kernel/time/ (diff) | |
| download | linux-2a53008033189ed09bfe241c6b33811ba4ce980d.tar.xz linux-2a53008033189ed09bfe241c6b33811ba4ce980d.zip | |
cpumask: zero extra bits in alloc_cpumask_var_node
Impact: extra safety checks during transition
When CONFIG_CPUMASKS_OFFSTACK is set, the new cpumask_ operators only
use bits up to nr_cpu_ids, not NR_CPUS. Using the old cpus_ operators
on these masks can mean accessing undefined bits.
After some discussion, Mike and I decided to err on the side of caution;
we zero the "undefined" bits in alloc_cpumask_var_node() until all the
old cpumask functions are removed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel/rcutree_trace.c')
0 files changed, 0 insertions, 0 deletions