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CONFIG_PACK_STACK: Pack kernel stack

General informations

The Linux kernel configuration item CONFIG_PACK_STACK:

Help text

This option enables the compiler option -mkernel-backchain if it is available. If the option is available the compiler supports the new stack layout which dramatically reduces the minimum stack frame size. With an old compiler a non-leaf function needs a minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With -mkernel-backchain the minimum size drops to 16 byte on 31 bit and 24 byte on 64 bit.

Say Y if you are unsure.

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