net: ibm: emac: Clear MAL descriptors without memset

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Clear MAL descriptor rings with explicit field stores instead of
memset().  The descriptor rings are carved from MAL coherent DMA memory,
which may be mapped uncached on 32-bit powerpc.  The optimized memset()
path can use dcbz there and trigger an alignment warning.

Use WRITE_ONCE() for each field to prevent the compiler from merging
the stores back into a memset() call.

The skb tracking arrays remain ordinary CPU memory and still use memset().

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20260603230754.5535-1-rosenp@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Rosen Penev 2026-06-03 16:07:53 -07:00 • committed by Jakub Kicinski

parent 8084fc9292

commit f0ba7f385d

1 changed files with 13 additions and 2 deletions

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drivers/net/ethernet/ibm/emac/core.c

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