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    SubjectRe: [PATCH] scripts/gdb/vmalloc: fix vmallocinfo error
    On Wed, 7 Feb 2024 16:58:51 +0800 Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> wrote:

    > We met the gdb vmallocinfo issue as following.
    >
    > (gdb) lx-vmallocinfo
    > Python Exception <class 'gdb.error'>: No symbol "vmap_area_list" in current context.
    > Error occurred in Python: No symbol "vmap_area_list" in current context.
    >
    > Since Mitigate a vmap lock contention patchset [1], we
    > remove the vmap_area_list.

    I don't think that's correct?

    > We need to use vmap_nodes to iterate all vmallocinfo.
    >
    > [1] https://lore.kernel.org/linux-mm/20240102184633.748113-1-urezki@gmail.com/

    vmap_area_list was removed by https://lkml.kernel.org/r/20240102184633.748113-6-urezki@gmail.com

    So I think this patch is actually a fix against mm.git:mm-unstable's
    mm-vmalloc-remove-vmap_area_list.patch?

    However this gdb function was probably probably broken earlier in that
    series, so perhaps this patch would be best staged as a predecessor to
    Ulad's vmalloc series.

    > Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
    > Cc: Casper Li <casper.li@mediatek.com>
    > ---
    > scripts/gdb/linux/vmalloc.py | 56 +++++++++++++++++++-----------------
    > 1 file changed, 29 insertions(+), 27 deletions(-)
    >
    > diff --git a/scripts/gdb/linux/vmalloc.py b/scripts/gdb/linux/vmalloc.py
    > index d3c8a0274d1e..803f17371052 100644
    > --- a/scripts/gdb/linux/vmalloc.py
    > +++ b/scripts/gdb/linux/vmalloc.py
    > @@ -29,32 +29,34 @@ class LxVmallocInfo(gdb.Command):
    > if not constants.LX_CONFIG_MMU:
    > raise gdb.GdbError("Requires MMU support")
    >
    > - vmap_area_list = gdb.parse_and_eval('vmap_area_list')
    > - for vmap_area in lists.list_for_each_entry(vmap_area_list, vmap_area_ptr_type, "list"):
    > - if not vmap_area['vm']:
    > - gdb.write("0x%x-0x%x %10d vm_map_ram\n" % (vmap_area['va_start'], vmap_area['va_end'],
    > - vmap_area['va_end'] - vmap_area['va_start']))
    > - continue
    > - v = vmap_area['vm']
    > - gdb.write("0x%x-0x%x %10d" % (v['addr'], v['addr'] + v['size'], v['size']))
    > - if v['caller']:
    > - gdb.write(" %s" % str(v['caller']).split(' ')[-1])
    > - if v['nr_pages']:
    > - gdb.write(" pages=%d" % v['nr_pages'])
    > - if v['phys_addr']:
    > - gdb.write(" phys=0x%x" % v['phys_addr'])
    > - if v['flags'] & constants.LX_VM_IOREMAP:
    > - gdb.write(" ioremap")
    > - if v['flags'] & constants.LX_VM_ALLOC:
    > - gdb.write(" vmalloc")
    > - if v['flags'] & constants.LX_VM_MAP:
    > - gdb.write(" vmap")
    > - if v['flags'] & constants.LX_VM_USERMAP:
    > - gdb.write(" user")
    > - if v['flags'] & constants.LX_VM_DMA_COHERENT:
    > - gdb.write(" dma-coherent")
    > - if is_vmalloc_addr(v['pages']):
    > - gdb.write(" vpages")
    > - gdb.write("\n")
    > + nr_vmap_nodes = gdb.parse_and_eval('nr_vmap_nodes')
    > + for i in range(0, nr_vmap_nodes):
    > + vn = gdb.parse_and_eval('&vmap_nodes[%d]' % i)
    > + for vmap_area in lists.list_for_each_entry(vn['busy']['head'], vmap_area_ptr_type, "list"):
    > + if not vmap_area['vm']:
    > + gdb.write("0x%x-0x%x %10d vm_map_ram\n" % (vmap_area['va_start'], vmap_area['va_end'],
    > + vmap_area['va_end'] - vmap_area['va_start']))
    > + continue
    > + v = vmap_area['vm']
    > + gdb.write("0x%x-0x%x %10d" % (v['addr'], v['addr'] + v['size'], v['size']))
    > + if v['caller']:
    > + gdb.write(" %s" % str(v['caller']).split(' ')[-1])
    > + if v['nr_pages']:
    > + gdb.write(" pages=%d" % v['nr_pages'])
    > + if v['phys_addr']:
    > + gdb.write(" phys=0x%x" % v['phys_addr'])
    > + if v['flags'] & constants.LX_VM_IOREMAP:
    > + gdb.write(" ioremap")
    > + if v['flags'] & constants.LX_VM_ALLOC:
    > + gdb.write(" vmalloc")
    > + if v['flags'] & constants.LX_VM_MAP:
    > + gdb.write(" vmap")
    > + if v['flags'] & constants.LX_VM_USERMAP:
    > + gdb.write(" user")
    > + if v['flags'] & constants.LX_VM_DMA_COHERENT:
    > + gdb.write(" dma-coherent")
    > + if is_vmalloc_addr(v['pages']):
    > + gdb.write(" vpages")
    > + gdb.write("\n")
    >
    > LxVmallocInfo()
    > --
    > 2.18.0

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