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From: Martin KaFai Lau <kafai@fb.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: <bpf@vger.kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>,
	<netdev@vger.kernel.org>, Song Liu <songliubraving@fb.com>
Subject: Re: [PATCH v2 bpf-next 3/4] bpf: Allow using bpf_sk_storage in FENTRY/FEXIT/RAW_TP
Date: Mon, 16 Nov 2020 10:51:51 -0800	[thread overview]
Message-ID: <20201116185151.iannqczqxmcj6xr4@kafai-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20201116104340.60692716@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>

On Mon, Nov 16, 2020 at 10:43:40AM -0800, Jakub Kicinski wrote:
> On Mon, 16 Nov 2020 10:37:49 -0800 Martin KaFai Lau wrote:
> > On Mon, Nov 16, 2020 at 10:00:04AM -0800, Jakub Kicinski wrote:
> > > Locks that can run in any context but preempt disabled or softirq
> > > disabled?  
> > Not exactly. e.g. running from irq won't work.
> > 
> > > Let me cut to the chase. Are you sure you didn't mean to check
> > > if (irq_count()) ?  
> > so, no.
> > 
> > From preempt.h:
> > 
> > /*
> >  * ...
> >  * in_interrupt() - We're in NMI,IRQ,SoftIRQ context or have BH disabled
> >  * ...
> >  */
> > #define in_interrupt()          (irq_count())
> 
> Right, as I said in my correction (in_irq() || in_nmi()).
> 
> Just to spell it out AFAIU in_serving_softirq() will return true when
> softirq is active and interrupted by a hard irq or an NMI.
I see what you have been getting at now.

Good point. will post a fix.

  reply	other threads:[~2020-11-16 18:52 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-12 21:12 [PATCH v2 bpf-next 0/4] bpf: Enable bpf_sk_storage for FENTRY/FEXIT/RAW_TP Martin KaFai Lau
2020-11-12 21:13 ` [PATCH v2 bpf-next 1/4] bpf: Folding omem_charge() into sk_storage_charge() Martin KaFai Lau
2020-11-12 21:48   ` KP Singh
2020-11-12 21:13 ` [PATCH v2 bpf-next 2/4] bpf: Rename some functions in bpf_sk_storage Martin KaFai Lau
2020-11-12 21:47   ` KP Singh
2020-11-12 21:13 ` [PATCH v2 bpf-next 3/4] bpf: Allow using bpf_sk_storage in FENTRY/FEXIT/RAW_TP Martin KaFai Lau
2020-11-15  1:17   ` Jakub Kicinski
2020-11-16 17:37     ` Martin KaFai Lau
2020-11-16 18:00       ` Jakub Kicinski
2020-11-16 18:02         ` Jakub Kicinski
2020-11-16 18:37         ` Martin KaFai Lau
2020-11-16 18:43           ` Jakub Kicinski
2020-11-16 18:51             ` Martin KaFai Lau [this message]
2020-11-12 21:13 ` [PATCH v2 bpf-next 4/4] bpf: selftest: Use " Martin KaFai Lau
2020-11-13  3:00 ` [PATCH v2 bpf-next 0/4] bpf: Enable bpf_sk_storage for FENTRY/FEXIT/RAW_TP patchwork-bot+netdevbpf

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