From: Bert Wesarg there seems to be a bug, at least for me, in kernel/param.c for arrays with .num == NULL. If .num == NULL, the function param_array_set() uses &.max for the call to param_array(), wich alters the .max value to the number of arguments. The result is, you can't set more array arguments as the last time you set the parameter. example: # a module 'example' with # static int array[10] = { 0, }; # module_param_array(array, int, NULL, 0644); $ insmod example.ko array=1,2,3 $ cat /sys/module/example/parameters/array 1,2,3 $ echo "4,3,2,1" > /sys/module/example/parameters/array $ dmesg | tail -n 1 kernel: array: can take only 3 arguments Signed-off-by: Bert Wesarg Signed-off-by: Andrew Morton --- 25-akpm/kernel/params.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletion(-) diff -puN kernel/params.c~kernel-paramc-dont-use-max-when-num-is-null-in kernel/params.c --- 25/kernel/params.c~kernel-paramc-dont-use-max-when-num-is-null-in 2005-03-28 17:23:10.000000000 -0800 +++ 25-akpm/kernel/params.c 2005-03-28 17:23:10.000000000 -0800 @@ -314,9 +314,10 @@ int param_array(const char *name, int param_array_set(const char *val, struct kernel_param *kp) { struct kparam_array *arr = kp->arg; + unsigned int temp_num; return param_array(kp->name, val, 1, arr->max, arr->elem, - arr->elemsize, arr->set, arr->num ?: &arr->max); + arr->elemsize, arr->set, arr->num ?: &temp_num); } int param_array_get(char *buffer, struct kernel_param *kp) _