On Thu, Jan 26, 2023 at 5:04 AM Conor Dooley <conor@xxxxxxxxxx> wrote: > Firstly, no-implicit-float is a CFLAG, so why add it to march? I placed it in march because I thought we need the flag in vdso. And, KBUILD_CFLAGS is not enough for vdso. However, I think we don't need this flag in vdso since it is run in user space anyway. > There is an existing patch on the list for enabling this flag, but I > recall Palmer saying that it was not actually needed? The flag is needed for clang builds to prevent auto-vectorization from using V in the kernel code [1]. > Palmer, do you remember why that was? The discussion[2] suggested that we need this flag, IIUC. But somehow the patch did make it into the tree. > [1]https://lore.kernel.org/all/CAOnJCULtT-y9vo6YhW7bW9XyKRdod-hvFfr02jHVamR_LcsKdA@xxxxxxxxxxxxxx/ [2]https://lore.kernel.org/all/20221216185012.2342675-1-abdulras@xxxxxxxxxx/
