Hi Thiago, On 2024-04-10 8:02 PM, Thiago Jung Bauermann wrote: > Samuel Holland <samuel.holland@xxxxxxxxxx> writes: >> On 2024-04-10 5:21 PM, Thiago Jung Bauermann wrote: >>> >>> Unfortunately this patch causes build failures on arm with allyesconfig >>> and allmodconfig. Tested with next-20240410. > > <snip> > >> In both cases, the issue is that the toolchain requires runtime support to >> convert between `unsigned long long` and `double`, even when hardware FP is >> enabled. There was some past discussion about GCC inlining some of these >> conversions[1], but that did not get implemented. > > Thank you for the explanation and the bugzilla reference. I added a > comment there mentioning that the problem came up again with this patch > series. > >> The short-term fix would be to drop the `select ARCH_HAS_KERNEL_FPU_SUPPORT` for >> 32-bit arm until we can provide these runtime library functions. > > Does this mean that patch 2 in this series: > > [PATCH v4 02/15] ARM: Implement ARCH_HAS_KERNEL_FPU_SUPPORT > > will be dropped? No, because later patches in the series (3, 6) depend on the definition of CC_FLAGS_FPU from that patch. I will need to send a fixup patch unless I can find a GPL-2 compatible implementation of the runtime library functions. Regards, Samuel
