diff options
| author | Rusty Russell <rusty@rustcorp.com.au> | 2008-10-27 11:03:33 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2008-10-27 11:03:33 +1100 |
| commit | 231f4be6e1309183fb959efbb8b008b8bee570ca (patch) | |
| tree | 2d8cf149c607a81c3457130151343c918306f1bd /lib | |
| parent | 6c989f9dc3cd4048d8af5df47825d0bff31d7a87 (diff) | |
cpumask:check-all-ops-for-limits
It's useful to check that no one is accessing > nr_cpumask_bits for
cpumasks. This also allows you to turn on CONFIG_CPUMASKS_OFFSTACK
even for smaller CONFIG_NR_CPUS.
It's a WARN_ON_ONCE because I *know* that UP-configured Cell processor
will currently trip this.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 6 | ||||
| -rw-r--r-- | lib/cpumask.c | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index b0f239e443bc..9c4286760490 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -761,6 +761,12 @@ config SYSCTL_SYSCALL_CHECK to properly maintain and use. This enables checks that help you to keep things correct. +config DEBUG_PER_CPU_MAPS + bool "Cpumask debug checks" + ---help--- + Extra debugging for cpumasks. + eg. to make sure accesses to cpumasks are < nr_cpu_ids. + source kernel/trace/Kconfig config PROVIDE_OHCI1394_DMA_INIT diff --git a/lib/cpumask.c b/lib/cpumask.c index 4795e69e5b63..48f475fd0b89 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -11,6 +11,9 @@ EXPORT_SYMBOL(cpumask_first); int cpumask_next(int n, const cpumask_t *srcp) { + /* -1 is a legal arg here. */ + if (n != -1) + cpumask_check(n); return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); } EXPORT_SYMBOL(cpumask_next); |