IA32 syscall 311 not implemented on x86_64

[dragoran]

I started to get such messages in dmesg:
IA32 syscall 311 from mozilla-xremote not implemented
IA32 syscall 311 from firefox-bin not implemented
IA32 syscall 311 from mplayer not implemented
what is syscall 311  and what effect does this have?
I am using 2.6.16-1.2111_FC5 (2.6.16.14)

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