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During a kexec restart, only the kernel is reloaded but notifier callbacks in firmware persist, causing state mismatches between kernel and firmware. To address this, introduce PM_ALL_NOTIFIERS node ID to unregister all notifier callbacks during kexec. On a graceful kexec restart, this occurs in zynqmp_firmware_shutdown(). On a crash kernel restart, it happens in zynqmp_firmware_probe() in the reloaded kernel. Unregistering all notifiers depends on firmware support for the PM_ALL_NOTIFIERS node ID. On firmware that does not implement it (the feature check reports a version below PM_API_VERSION_3) the step is skipped and a warning such as "Firmware doesn't support unregister all notifiers at once" is logged, e.g. on Versal NET firmware that predates this API. Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@amd.com> Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com> Reviewed-by: Prasanna Kumar T S M <ptsm@linux.microsoft.com> Link: https://patch.msgid.link/20260729122522.3732875-4-jay.buddhabhatti@amd.com Signed-off-by: Michal Simek <michal.simek@amd.com>