On Tue, Jan 02, 2024 at 04:53:53PM +0800, richard clark wrote: > Ah, the driver is trying to use the native gcc built atomic ops like: > __sync_val_compare_and_swap, but it seems the native aarch64 doesn't > provide these builtin atomic primitives while they are in the cross > compile toolchain. > The issue can be resolved by replacing the > **__sync_val_compare_and_swap** with **atomic_cmpxchg**. Yup, that's the right thing to do; drivers *shouldn't* use the builtins directly, and *should* use the kernel's native atomic*() API. > But don't know why the native aarch64 toolchain doesn't have those > builtin atomic functions... I suspect this is down to your toolchain enabling -moutline-atomics by default; that expands the builtins into calls to out-of-line functions. I suspect your cross-compile toolchain doesn't enable that by default. As above, since nothing should be using the builtins, we don't implement out-of-line versions nor do we override the option. Mark. > On Tue, Jan 2, 2024 at 11:29 AM richard clark > <richard.xnu.clark@xxxxxxxxx> wrote: > > > > Hi, > > > > I have a strong power arm64 box, and the linux distro is ubuntu 22.04, > > the native gcc version is: > > > > $ gcc --version > > gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 > > Copyright (C) 2021 Free Software Foundation, Inc. > > This is free software; see the source for copying conditions. There is NO > > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > > > > It will abort the kernel build with the complaint by 'make Image': > > ld: Unexpected GOT/PLT entries detected! > > ld: Unexpected run-time procedure linkages detected! > > ld: ID map text too big or misaligned > > ld: drivers/net/nvidia_eth.o: in function `osi_lock_irq_enabled': > > osi_hal.c:(.text+0x3cc): undefined reference to `__aarch64_cas4_sync' > > ... > > > > But the cross-compile with aarch64-linux-gnu-gcc on the x86 box > > doesn't show the above error message. > > Any comments/suggestions? Thanks very much! > > > > Richard >
