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helpers.linux.stackdepot: update stack_depot_fetch() for Linux 6.9 and 6.8.5, take 2

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Now that we reverted our hack, we can handle the newly-renamed field
properly.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
This commit is contained in:
Omar Sandoval 2024-04-10 23:12:14 -07:00
parent 01940eb367
commit 8e6127c751
1 changed files with 13 additions and 1 deletions
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14
drgn/helpers/linux/stackdepot.py
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@ -30,9 +30,21 @@ def stack_depot_fetch(handle: Object) -> Optional[StackTrace]:
# Renamed in Linux kernel commit 961c949b012f ("lib/stackdepot: rename slab
# to pool") (in v6.3).
try:
pool = prog["stack_pools"][handle_parts.pool_index]
stack_pools = prog["stack_pools"]
except KeyError:
pool = prog["stack_slabs"][handle_parts.slabindex]
else:
# Linux kernel commit 3ee34eabac2a ("lib/stackdepot: fix first entry
# having a 0-handle") (in v6.9-rc1) changed the meaning of pool_index.
# Linux kernel commit a6c1d9cb9a68 ("stackdepot: rename pool_index to
# pool_index_plus_1") (in v6.9-rc3) renamed pool_index to reflect the
# new meaning. This will therefore be wrong for v6.9-rc[1-2] and
# v6.8.[3-4].
try:
pool_index = handle_parts.pool_index_plus_1 - 1
except AttributeError:
pool_index = handle_parts.pool_index
pool = stack_pools[pool_index]
if not pool:
return None