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Last active December 20, 2015 11:19
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building kernel
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kernel_build.md

Third-party module build broken with kernel

Summary: Third-party module build is broken with kernel (up-to 3.5 as I tested) with -g.

Error:
include/linux/rcupdate.h: In function ‘__kfree_rcu’:
include/linux/rcupdate.h:918:2: error: size of unnamed array is negative

Quick fix:
Adding -Os or -O2 to your KBUILD_CFLAGS.

Reference: See LKML thread.

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