Subject: [Bug 215217] New: Kernel fails to boot at an early stage when built with GCC_PLUGIN_LATENT_ENTROPY=y (PowerMac G4 3,6)

From: [email-masked]
Date: Sat, 04 Dec 2021 22:48:03 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=215217

            Bug ID: 215217
           Summary: Kernel fails to boot at an early stage when built with
                    GCC_PLUGIN_LATENT_ENTROPY=y (PowerMac G4 3,6)
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.16-rc3
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: [email-masked]
          Reporter: [email-masked]
                CC: [email-masked]
        Regression: No

Created attachment 299871
  --> https://bugzilla.kernel.org/attachment.cgi?id=299871&action=edit
kernel .config (5.16-rc3, PowerMac G4 DP)

Get this on my PowerMac G4 DP when I build a kernel with
GCC_PLUGIN_LATENT_ENTROPY=y. The kernel gets decompressed but shortly
afterwards the machine freezes, displaying in black letters on an entirely
white screen:

done
found display   : /pci@f0000000/ATY,AlteracParent@10/ATY,Alterac_B@1,
opening...

Same kernel config built without GCC_PLUGIN_LATENT_ENTROPY just boots fine.
Happens on v5.15.5 and v5.16-rc3. I did not test other kernel versions yet.

My Talos II (Power9) on the other hand just works fine with a
GCC_PLUGIN_LATENT_ENTROPY=y built kernel.

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