This command allows users to quickly retrieve a stacktrace using a handle
obtained from a memory coredump.

Example output:
(gdb) lx-stack_depot_lookup 0x00c80300
   0xffff8000807965b4 <kmem_cache_alloc_noprof+660>:    mov     x20, x0
   0xffff800081a077d8 <kmem_cache_oob_alloc+76>:        mov     x1, x0
   0xffff800081a079a0 <test_version_show+100>:  cbnz    w0, 0xffff800081a07968 <test_version_show+44>
   0xffff800082f4a3fc <kobj_attr_show+60>:      ldr     x19, [sp, #16]
   0xffff800080a0fb34 <sysfs_kf_seq_show+460>:  ldp     x3, x4, [sp, #96]
   0xffff800080a0a550 <kernfs_seq_show+296>:    ldp     x19, x20, [sp, #16]
   0xffff8000808e7b40 <seq_read_iter+836>:      mov     w5, w0
   0xffff800080a0b8ac <kernfs_fop_read_iter+804>:       mov     x23, x0
   0xffff800080914a48 <copy_splice_read+972>:   mov     x6, x0
   0xffff8000809151c4 <do_splice_read+348>:     ldr     x21, [sp, #32]

Link: https://lkml.kernel.org/r/20240723064902.124154-5-kuan-ying.lee@canonical.com
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

We encounter the following issue after commit a6c1d9cb9a68 ("stackdepot:
rename pool_index to pool_index_plus_1").

(gdb) lx-dump-page-owner --pfn 262144
...
Python Exception <class 'gdb.error'>: There is no member named pool_index.
Error occurred in Python: There is no member named pool_index.

We rename pool_index to pool_index_plus_1 to fix this issue.

Link: https://lkml.kernel.org/r/20240619074911.100434-7-kuan-ying.lee@canonical.com
Fixes: a6c1d9cb9a68 ("stackdepot: rename pool_index to pool_index_plus_1")
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

After stackdepot evicting support patchset[1], we rename pool_index to
pools_num.

To avoid from the below issue, we rename consistently in
gdb scripts.

Python Exception <class 'gdb.error'>: No symbol "pool_index" in current
context.
Error occurred in Python: No symbol "pool_index" in current context.

[1] https://lore.kernel.org/linux-mm/cover.1700502145.git.andreyknvl@google.com/
Link: https://lkml.kernel.org/r/20231129065142.13375-3-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Add support for printing the backtrace of stackdepot handle.

This is the preparation patch for dumping page_owner,
slabtrace usage.

Link: https://lkml.kernel.org/r/20230808083020.22254-6-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>