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Date:   Tue, 28 Nov 2023 15:42:22 +0000
From:   "Russell King (Oracle)" <linux@armlinux.org.uk>
To:     Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc:     linux-pm@vger.kernel.org, loongarch@lists.linux.dev,
        linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org,
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        James Morse <james.morse@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH RFC 02/22] x86: intel_epb: Don't rely on link order
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 <20231128144059.000042c8@Huawei.com>
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On Tue, Nov 28, 2023 at 02:40:59PM +0000, Jonathan Cameron wrote:
> On Tue, 07 Nov 2023 10:29:28 +0000
> Russell King <rmk+kernel@armlinux.org.uk> wrote:
> 
> > From: James Morse <james.morse@arm.com>
> > 
> > intel_epb_init() is called as a subsys_initcall() to register cpuhp
> > callbacks. The callbacks make use of get_cpu_device() which will return
> > NULL unless register_cpu() has been called. register_cpu() is called
> > from topology_init(), which is also a subsys_initcall().
> > 
> > This is fragile. Moving the register_cpu() to a different
> > subsys_initcall()  leads to a NULL dereference during boot.
> > 
> > Make intel_epb_init() a late_initcall(), user-space can't provide a
> > policy before this point anyway.
> > 
> > Signed-off-by: James Morse <james.morse@arm.com>
> > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
> 
> Seems reasonable. FWIW
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Thanks, however this has already been merged into the tip tree since
Rafael suggested sending it separately.

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