On Mon, Dec 15, 2025 at 12:57:51PM -0500, Lyude Paul wrote:
> While OpenRISC currently doesn't fail to build upstream, it appears that
> include <asm/smp.h> in the right headers is enough to break that -
> primarily because OpenRISC's asm/smp.h header doesn't actually provide any
> definition for struct cpumask. Which means the only reason we aren't
> failing to build kernel is because we've been lucky enough that every spot
> including asm/smp.h already has definitions for struct cpumask pulled in.
>
> This became evident when trying to work on a patch series for adding
> ref-counted interrupt enable/disables to the kernel, where introducing a
> new interrupt_rc.h header suddenly introduced a build error on OpenRISC:
>
> In file included from include/linux/interrupt_rc.h:17,
> from include/linux/spinlock.h:60,
> from include/linux/mmzone.h:8,
> from include/linux/gfp.h:7,
> from include/linux/mm.h:7,
> from arch/openrisc/include/asm/pgalloc.h:20,
> from arch/openrisc/include/asm/io.h:18,
> from include/linux/io.h:12,
> from drivers/irqchip/irq-ompic.c:61:
> arch/openrisc/include/asm/smp.h:21:59: warning: 'struct cpumask'
> declared inside parameter list will not be visible outside of this
> definition or declaration
> 21 | extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
> | ^~~~~~~
> arch/openrisc/include/asm/smp.h:23:54: warning: 'struct cpumask'
> declared inside parameter list will not be visible outside of this
> definition or declaration
> 23 | extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
> | ^~~~~~~
> drivers/irqchip/irq-ompic.c: In function 'ompic_of_init':
> >> drivers/irqchip/irq-ompic.c:191:28: error: passing argument 1 of
> 'set_smp_cross_call' from incompatible pointer type
> [-Werror=incompatible-pointer-types]
> 191 | set_smp_cross_call(ompic_raise_softirq);
> | ^~~~~~~~~~~~~~~~~~~
> | |
> | void (*)(const struct cpumask *, unsigned int)
> arch/openrisc/include/asm/smp.h:23:32: note: expected 'void (*)(const
> struct cpumask *, unsigned int)' but argument is of type 'void
> (*)(const struct cpumask *, unsigned int)'
> 23 | extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
>
> To fix this, let's take an example from the smp.h headers of other
> architectures (x86, hexagon, arm64, probably more): just include
> linux/cpumask.h at the top.
>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> ---
> arch/openrisc/include/asm/smp.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/openrisc/include/asm/smp.h b/arch/openrisc/include/asm/smp.h
> index e21d2f12b5b67..0327d8cdae2d0 100644
> --- a/arch/openrisc/include/asm/smp.h
> +++ b/arch/openrisc/include/asm/smp.h
> @@ -9,6 +9,8 @@
> #ifndef __ASM_OPENRISC_SMP_H
> #define __ASM_OPENRISC_SMP_H
>
> +#include <linux/cpumask.h>
> +
> #include <asm/spr.h>
> #include <asm/spr_defs.h>
This looks good to me.
Acked-by: Stafford Horne <shorne@gmail.com>