Ubuntu: package kernels built with -fno-inline-functions-called-once

[joe-lawrence]

@vincentbernat pointed out that Ubuntu kernels are built with -fno-inline-functions-called-once
I think this compiler argument is coming out of the source package's debian/rules.d/0-common-vars.mk file. Both Trusty and Xenial setup kmake the same way:

kmake = make ARCH=$(build_arch) \
	CROSS_COMPILE=$(CROSS_COMPILE) \
	KERNELVERSION=$(abi_release)-$(target_flavour) \
	CONFIG_DEBUG_SECTION_MISMATCH=y \
	KBUILD_BUILD_VERSION="$(uploadnum)" \
	LOCALVERSION= localver-extra= \
	CFLAGS_MODULE="-DPKG_ABI=$(abinum)"

Where manually turning on CONFIG_DEBUG_SECTION_MISMATCH will in turn add -fno-inline-functions-called-once to the kernel build line.

Note that the only code that uses PKG_ABI (in Trusty's 3.13.0-119-generic at least) is driver/hv/hv.c to generate a unique "guest_id" for the hyperv driver. (The PKG_ABI number corresponds to the xyz-generic value in the kernel package name.)

[joe-lawrence]

Closing stale issue.