On Wed, Apr 20, 2016 at 04:01:39PM -0700, Shi, Yang wrote: > When I enable memory comact via > > # echo 1 > /proc/sys/vm/compact_memory > > I got the below WARNING: > > set_pte_at: racy dirty state clearing: 0x0068000099371bd3 -> > 0x0068000099371fd3 > ------------[ cut here ]------------ > WARNING: CPU: 5 PID: 294 at ./arch/arm64/include/asm/pgtable.h:227 > ptep_set_access_flags+0x138/0x1b8 > Modules linked in: Do you have this patch applied: http://article.gmane.org/gmane.linux.ports.arm.kernel/492239 It's also queued into -next as commit 66dbd6e61a52. > My kernel has ARM64_HW_AFDBM enabled, but LS2085 is not ARMv8.1. > > The code shows it just check if ARM64_HW_AFDBM is enabled or not, but > doesn't check if the CPU really has such capability. > > So, it might be better to have the capability checked runtime? The warnings are there to spot any incorrect uses of the pte accessors even before you run on AF/DBM-capable hardware. -- Catalin -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>