linux kernel - How to get registered filesystems list? -

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on debugging linux kernel 3.6.11 - "ddd vmlinux /proc/kcore" , "file_systems" list present in fs/filesystems.c shown empty, containing address 0x0 .

it supposed contain file_system_type structures of registered file systems .

why list empty or else can see list of registered file systems ?

debugging kernel not needed that. there proc api provides information:

cat /proc/filesystems

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