Re: [Crash-utility] [PATCH] Fix "kmem -v" option displaying no regions on Linux 6.3 and later

On Thu, May 18, 2023 at 12:28 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com&gt; wrote: > Kernel commit 869176a09606 ("mm/vmalloc.c: add flags to mark vm_map_ram > area"), which is contained in Linux 6.3 and later, added "flags" member > to struct vmap_area. This was the revival of the "flags" member as > kernel commit 688fcbfc06e4 had eliminated it before. > > As a result, crash started to use the old procedure using the member and > displays no vmalloc'd regions, because it does not have the same flag > value as the old one. > > crash> kmem -v > VMAP_AREA VM_STRUCT ADDRESS RANGE > SIZE > crash> > > To fix this, also check if vmap_area.purge_list exists, which was > introduced with the flags and removed later, to determine that the flags > member is the old one. > > Related vmap_area history: > v2.6.28 db64fe02258f introduced vmap_area with flags and purge_list > v5.4 688fcbfc06e4 removed flags > v5.11 96e2db456135 removed purge_list > v6.3 869176a09606 added flags again > Thank you for the fix, Kazu. It looks good to me. So: Ack.