Re: [PATCH 08/21] drivers: base: Implement weak arch_unregister_cpu()

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On 11/22/23 00:44, Russell King (Oracle) wrote:
From: James Morse <james.morse@xxxxxxx>

Add arch_unregister_cpu() to allow the ACPI machinery to call
unregister_cpu(). This is enough for arm64, riscv and loongarch, but
needs to be overridden by x86 and ia64 who need to do more work.

CC: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Signed-off-by: James Morse <james.morse@xxxxxxx>
Reviewed-by: Shaoqin Huang <shahuang@xxxxxxxxxx>
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
---
An open question remains from the RFC v2 posting: should we provide a
__weak stub for !HOTPLUG_CPU as well, since in later patches ACPI may
reference this if the compiler doesn't optimise as we expect?

Changes since v1:
  * Added CONFIG_HOTPLUG_CPU ifdeffery around unregister_cpu
Changes since RFC v2:
  * Move earlier in the series
---
  drivers/base/cpu.c | 9 ++++++++-
  1 file changed, 8 insertions(+), 1 deletion(-)


Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>





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