[Bug 220272] Latent race condition in USB code unveiled with optimized memset_64.S

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220272

--- Comment #30 from Marcus Seyfarth (m.seyfarth@gmail.com) ---
Created attachment 308369
  --> https://bugzilla.kernel.org/attachment.cgi?id=308369&action=edit
Fixed memset_64.S

I've tried out a few different things which failed during the past week. But
today, Grok 4 found some issues in my custom memset_64.S and its fixes indeed
fixed the mouse issue for me. I've attached the new custom memset.

It claims:

 * Corrected feature to X86_FEATURE_ERMS (not FSRM, which is for movs).
 * Fixed return value corruption in ERMS path by properly saving/restoring
original dst pointer (root cause of issues like non-working mouse on boot).

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