cxl/mce: Avoid alias page retirement for corrected errors

cxl_handle_mce() offlines the aliased page of an Extended Linear Cache
(ELC) region for any MCE with a usable address in the region. This
includes corrected errors, needlessly reducing usable memory.

Skip ELC alias retirement when mce_is_correctable() identifies the
reported error as corrected. Uncorrected errors with a usable address
in the ELC region continue to retire the aliased page as before.

mce_usable_address() already implements the per-vendor checks that
determine whether the reported address is usable, so no separate
memory-error classification is needed.

On AMD, a corrected legacy bank 4 DRAM ECC error (XEC 8) reports a
usable address and retired the aliased page before this change.
Tested under QEMU with Intel Skylake-Server and AMD EPYC-Milan models.

Fixes: 516e5bd0b6bf ("cxl: Add mce notifier to emit aliased address for extended linear cache")
Signed-off-by: Shaikh Kamaluddin <shaikhkamal2012@gmail.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260824134957.11085-1-shaikhkamal2012@gmail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions