From: Puranjay Mohan <puranjay@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Sumit Garg <sumit.garg@linaro.org>,
Stephen Boyd <swboyd@chromium.org>,
Douglas Anderson <dianders@chromium.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Mark Rutland <mark.rutland@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH v2 1/2] arm64/arch_timer: include <linux/percpu.h>
Date: Fri, 03 May 2024 09:44:14 +0000 [thread overview]
Message-ID: <mb61p4jbf8c29.fsf@kernel.org> (raw)
In-Reply-To: <7008cd0c-5b65-4289-9015-434cbe3d7e21@arm.com>
Anshuman Khandual <anshuman.khandual@arm.com> writes:
> On 5/2/24 18:04, Puranjay Mohan wrote:
>> arch_timer.h includes linux/smp.h to use DEFINE_PER_CPU() and it works
>> because smp.h includes percpu.h. The next commit will remove percpu.h
>> from smp.h and it will break this usage.
>>
>> Explicitly include percpu.h and remove smp.h
>
> But this particular change does not seem to be necessary for changing
> raw_smp_processor_id() as current_thread_info()->cpu being done in the
> later patch ? You might still leave header <asm/percpu.h> inclusion in
> arch/arm64/include/asm/smp.h while dropping the per cpu cpu_number ?
commit 57c82954e77f ("arm64: make cpu number a percpu variable")
created this percpu variable and included <asm/percpu.h> in <asm/smp.h>
Now we are removing the percpu variable cpu_number from smp.h, so there
is no need to keep percpu.h in smp.h
I feel users of DECLARE_PER_CPU_[...], etc. should include percpu.h and
not smp.h as it makes reading the code more easier and can thwart build
issues in the future, when headers are changed.
Thanks,
Puranjay
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next prev parent reply other threads:[~2024-05-03 9:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-02 12:34 [PATCH v2 1/2] arm64/arch_timer: include <linux/percpu.h> Puranjay Mohan
2024-05-02 12:34 ` [PATCH v2 2/2] arm64: implement raw_smp_processor_id() using thread_info Puranjay Mohan
2024-05-03 9:14 ` Anshuman Khandual
2024-05-03 15:30 ` Mark Rutland
2024-05-06 6:57 ` Anshuman Khandual
2024-05-03 9:07 ` [PATCH v2 1/2] arm64/arch_timer: include <linux/percpu.h> Anshuman Khandual
2024-05-03 9:44 ` Puranjay Mohan [this message]
2024-05-06 6:10 ` Anshuman Khandual
2024-05-03 15:21 ` Mark Rutland
2024-05-03 15:14 ` Mark Rutland
2024-05-06 6:55 ` Anshuman Khandual
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