When importing the hashtable code in I8ef73a62fe9846ce45058eb21cf999dd3eed5741
I didn't import actual implementations of the fls() and fls64()
implementations, as at least gcc-10 was smart enough to detect
we only use it on constant types and hence the computation can happen
at build time via const_ilog2()
However, in our jenkins build verification' this doesn't appear to
happen, as we get below errors:
/build/deps/install/stow/libosmocore/include/osmocom/core/log2.h: In function ‘__ilog2_u32’:
/build/deps/install/stow/libosmocore/include/osmocom/core/log2.h:20:9: error: implicit declaration of function ‘fls’ [-Werror=implicit-function-declaration]
return fls(n) - 1;
^~~
/build/deps/install/stow/libosmocore/include/osmocom/core/log2.h: In function ‘__ilog2_u64’:
/build/deps/install/stow/libosmocore/include/osmocom/core/log2.h:28:9: error: implicit declaration of function ‘fls64’ [-Werror=implicit-function-declaration]
return fls64(n) - 1;
^~~~~
Let's provide some generic implementations for this case. If needed
one could also introduce architecture-specific assembly implementations
like in the Linux kernel, but so far we managed to keep libosmocore free
of any assembly tweaks.
Change-Id: Ifa4898eb66c8d949618edd47961b7a0330ed35b5
For more than a decade we've used the linuxlist.h for double-linked
lists. Let's also add the hlist (double-linked lists with single
pointer sized head, and the hashtable that builds on top of it.
This reflects the versions included in Linux 5.8 with some modifications
to make them build in userspace (remove RCU versions, adjust for
userspace include files and types, convert to doxygen).
Change-Id: I8ef73a62fe9846ce45058eb21cf999dd3eed5741
Harald Welte