x86/cpu: Fix a F00F bug warning and clean up surrounding code

On x86 SMP systems with the F00F bug present, do_clear_cpu_cap()
rightfully warns that the code clears the X86_BUG_F00F flag after
alternatives have been patched.

X86_BUG_F00F is first cleared in intel_workarounds() and then set for
the affected models. This sequence works fine on the BSP but on AP
bringup, where alternatives have already been patched and clearing the
flag there triggers the warning.

There is no technical reason for clearing the flag before setting it. It
is mainly an artifact of introducing the X86_BUG_F00F flag in

  e2604b49e8a8 ("x86, cpu: Convert F00F bug detection").

Remove the unnecessary clearing of the flag.

While at it, remove the kernel notification and the surrounding logic to
inform the user about the workaround exactly once. If needed, the
presence of the F00F bug can be determined through /proc/cpuinfo.

Additionally, the F00F bug was the last remaining user of clear_cpu_bug().
With no users left, get rid of this helper as well.

  [ bp: Massage commit message. ]

Co-developed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Ahmed S. Darwish <darwi@linutronix.de>
Link: https://patch.msgid.link/20260528184826.3642051-1-sohil.mehta@intel.com

0 files changed, 0 insertions, 0 deletions