On Sun, Jul 01, 2018 at 07:09:41PM -0400, Peter Geis wrote:
> The warning is as follows:
> [10409.408904] ------------[ cut here ]------------
> [10409.408912] WARNING: CPU: 0 PID: 38 at ./include/linux/xarray.h:53
> workingset_eviction+0x14c/0x154
This is interesting. Here's the code that leads to the warning:
static void *pack_shadow(int memcgid, pg_data_t *pgdat, unsigned long eviction)
{
eviction >>= bucket_order;
eviction = (eviction << MEM_CGROUP_ID_SHIFT) | memcgid;
eviction = (eviction << NODES_SHIFT) | pgdat->node_id;
return xa_mk_value(eviction);
}
The warning itself comes from:
static inline void *xa_mk_value(unsigned long v)
{
WARN_ON((long)v < 0);
return (void *)((v << 1) | 1);
}
The fact that we haven't seen this on other architectures makes me wonder
if NODES_SHIFT or MEM_CGROUP_ID_SHIFT are messed up on Tegra?
Johannes, I wonder if you could help out here? I'm not terribly familiar
with this part of the workingset code.
