Ensure we allow 512 kiB + 1 page for user control without assuming a 4096 page size.
Reported-by: Peter Zijlstra <[email protected]> Signed-off-by: Frederic Weisbecker <[email protected]> Cc: Stable <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Stephane Eranian <[email protected]> --- kernel/perf_event.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/perf_event.c b/kernel/perf_event.c index c75925c..2616909 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -145,8 +145,8 @@ static struct srcu_struct pmus_srcu; */ int sysctl_perf_event_paranoid __read_mostly = 1; -/* Minimum for 128 pages + 1 for the user control page */ -int sysctl_perf_event_mlock __read_mostly = 516; /* 'free' kb per user */ +/* Minimum for 512 kiB + 1 user control page */ +int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /* 'free' kiB per user */ /* * max perf event sample rate -- 1.7.3.2 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
