6.15-stable review patch. If anyone has any objections, please let me know.
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From: Klara Modin klarasmodin@gmail.com
commit c5136add3f9b4c23b8bbe5f4d722c95d4cfb936e upstream.
The mailbox controller driver for the Microchip Inter-processor Communication can be built as a module. It uses cpuid_to_hartid_map and commit 4783ce32b080 ("riscv: export __cpuid_to_hartid_map") enables that to work for SMP. However, cpuid_to_hartid_map uses boot_cpu_hartid on non-SMP kernels and this driver can be useful in such configurations[1].
Export boot_cpu_hartid so the driver can be built as a module on non-SMP kernels as well.
Link: https://lore.kernel.org/lkml/20250617-confess-reimburse-876101e099cb@spud/ [1] Cc: stable@vger.kernel.org Fixes: e4b1d67e7141 ("mailbox: add Microchip IPC support") Signed-off-by: Klara Modin klarasmodin@gmail.com Acked-by: Conor Dooley conor.dooley@microchip.com Link: https://lore.kernel.org/r/20250617125847.23829-1-klarasmodin@gmail.com Signed-off-by: Palmer Dabbelt palmer@dabbelt.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/setup.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index f7c9a1caa83e..14888e5ea19a 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -50,6 +50,7 @@ atomic_t hart_lottery __section(".sdata") #endif ; unsigned long boot_cpu_hartid; +EXPORT_SYMBOL_GPL(boot_cpu_hartid);
/* * Place kernel memory regions on the resource tree so that