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mm/vmalloc: explicitly identify vm_map_ram area when shown in /proc/vmcoreinfo 

Now, by marking VMAP_RAM in vmap_area->flags for vm_map_ram area, we can
clearly differentiate it with other vmalloc areas.  So identify
vm_map_area area by checking VMAP_RAM of vmap_area->flags when shown in
/proc/vmcoreinfo.

Meanwhile, the code comment above vm_map_ram area checking in s_show() is
not needed any more, remove it here.

Link: https://lkml.kernel.org/r/20230206084020.174506-5-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baoquan He 2023-02-06 16:40:17 +08:00 committed by Andrew Morton
parent 06c8994626
commit bba9697b42
1 changed files with 4 additions and 7 deletions
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11
mm/vmalloc.c
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@ -4152,14 +4152,11 @@ static int s_show(struct seq_file *m, void *p)
va = list_entry(p, struct vmap_area, list);
/*
* s_show can encounter race with remove_vm_area, !vm on behalf
* of vmap area is being tear down or vm_map_ram allocation.
*/
if (!va->vm) {
seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n",
(void *)va->va_start, (void *)va->va_end,
va->va_end - va->va_start);
if (va->flags & VMAP_RAM)
seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n",
(void *)va->va_start, (void *)va->va_end,
va->va_end - va->va_start);
goto final;
}