From: Eric Dumazet <eric.duma...@gmail.com> Date: Sat, 25 Apr 2015 09:35:24 -0700
> From: Eric Dumazet <eduma...@google.com> > > Commit 567e4b79731c ("net: rfs: add hash collision detection") had one > mistake : > > RPS_NO_CPU is no longer the marker for invalid cpu in set_rps_cpu() > and get_rps_cpu(), as @next_cpu was the result of an AND with > rps_cpu_mask > > This bug showed up on a host with 72 cpus : > next_cpu was 0x7f, and the code was trying to access percpu data of an > non existent cpu. > > In a follow up patch, we might get rid of compares against nr_cpu_ids, > if we init the tables with 0. This is silly to test for a very unlikely > condition that exists only shortly after table initialization, as > we got rid of rps_reset_sock_flow() and similar functions that were > writing this RPS_NO_CPU magic value at flow dismantle : When table is > old enough, it never contains this value anymore. > > Fixes: 567e4b79731c ("net: rfs: add hash collision detection") > Signed-off-by: Eric Dumazet <eduma...@google.com> > Cc: Tom Herbert <t...@herbertland.com> > Cc: Ben Hutchings <b...@decadent.org.uk> Applied and queued up for 4.0-stable, thanks Eric. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html