cxl: Tighten CPER kfifo registration API and symbol visibility

Tighten the CPER protocol error kfifo registration API and symbol
visibility.

Use EXPORT_SYMBOL_FOR_MODULES() instead of EXPORT_SYMBOL_NS_GPL() for
the CPER kfifo registration symbols. This names the consuming module
explicitly and gives compile-time enforcement.

Drop the work_struct argument from the unregister path. Change the
WARN_ONCE condition to a NULL check since there is no caller pointer
to compare against anymore.

Return void from the registration helpers whose result callers ignore.
cxl_cper_register_work() keeps its int return as the only one consumed by
a caller. Flag double registration with WARN_ONCE() inside the lock
instead of returning an error.

Change cxl_ras_init() to void because there is one consumer and one
producer so the error return was unnecessary. Remove the now-dead error
check in cxl_core_init().

Co-developed-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <djbw@kernel.org>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260803221810.3685703-5-terry.bowman@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions