The patch titled
Subject: mm/vmalloc: explicitly identify vm_map_ram area when shown in /proc/vmcoreinfo
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-explicitly-identify-vm_map_ram-area-when-shown-in-proc-vmcoreinfo.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-explicitly-identify-vm_map_ram-area-when-shown-in-proc-vmcoreinfo.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: mm/vmalloc: explicitly identify vm_map_ram area when shown in /proc/vmcoreinfo
Date: Fri, 13 Jan 2023 11:19:18 +0800
Now, by marking VMAP_RAM in vmap_area->flags for vm_map_ram, 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/20230113031921.64716-5-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Stephen Brennan <stephen.s.brennan@xxxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/vmalloc.c~mm-vmalloc-explicitly-identify-vm_map_ram-area-when-shown-in-proc-vmcoreinfo
+++ a/mm/vmalloc.c
@@ -4225,11 +4225,7 @@ static int s_show(struct seq_file *m, vo
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) {
+ if (!va->vm && (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);
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
mm-vmallocc-add-used_map-into-vmap_block-to-track-space-of-vmap_block.patch
mm-vmallocc-add-flags-to-mark-vm_map_ram-area.patch
mm-vmallocc-allow-vread-to-read-out-vm_map_ram-areas.patch
mm-vmalloc-explicitly-identify-vm_map_ram-area-when-shown-in-proc-vmcoreinfo.patch
mm-vmalloc-skip-the-uninitilized-vmalloc-areas.patch
powerpc-mm-add-vm_ioremap-flag-to-the-vmalloc-area.patch
sh-mm-set-vm_ioremap-flag-to-the-vmalloc-area.patch
