Half of the support for the #initrd (not to be confused with #initramfs!) was removed from #Linux 7.0 through a #vfs merge from @brauner:
https://git.kernel.org/torvalds/c/996812c453cafa042f2e674738dbf8fa495661f3 and https://git.kernel.org/torvalds/c/ef12d0573a7f5e7a495e81d773ae5f3e98230cd4
""Remove the deprecated linuxrc-based initrd code path and related dead code. The linuxrc initrd path was deprecated in 2020 and this series completes its removal. If we see real-life regressions we'll revert. […]
The no-op load_ramdisk= and prompt_ramdisk= parameters are dropped, and noinitrd and ramdisk_start= gain deprecation warnings.
Initramfs is entirely unaffected. The non-linuxrc initrd path (root=/dev/ram0) is preserved but now carries a deprecation warning targeting January 2027 removal""
