Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [PATCH 02/13] kernel/cpu: Add support for declaring CPU hotplug not supported | Date | Wed, 11 Oct 2023 15:08:11 +0200 |
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On Thu, Oct 05 2023 at 16:13, Kirill A. Shutemov wrote: > The function cpu_hotplug_not_supported() can be called to indicate that > CPU hotplug should be disabled. It does not prevent the initial bring up > of the CPU, but it stops subsequent offlining.
This tells me what the patch is doing, but not the why.
> This function is intended to replace CC_ATTR_HOTPLUG_DISABLED.
> --- a/include/linux/cpu.h > +++ b/include/linux/cpu.h > @@ -132,6 +132,7 @@ extern void cpus_read_lock(void); > extern void cpus_read_unlock(void); > extern int cpus_read_trylock(void); > extern void lockdep_assert_cpus_held(void); > +extern void cpu_hotplug_not_supported(void);
This function name sucks.
The point is as you explained to prevent offlining, but not onlining. So can we please make this very clear? Something like:
cpu_hotplug_disable_offlining()
> +/* Cleared if platform declares CPU hotplug not supported */ > +static bool cpu_hotplug_supported = true;
Again. This is not about disabling hotplug all together. Something like:
static bool cpu_hotplug_offline_disabled;
Which expresses clearly what this is about and does not require this awkward negation.
Thanks,
tglx
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