linux-kernel - Re: [PATCH 1/2] pci: host: pci-hyperv: Replace GFP_ATOMIC with GFP_KERNEL in hv_pci

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Date:   Mon, 19 Mar 2018 11:44:11 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Cc:     "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] pci: host: pci-hyperv: Replace GFP_ATOMIC with
 GFP_KERNEL in hv_pci_onchannelcallback



On 2018/3/19 10:52, KY Srinivasan wrote:
>
>> -----Original Message-----
>> From: Jia-Ju Bai <baijiaju1990@...il.com>
>> Sent: Sunday, March 18, 2018 7:53 AM
>> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
>> <haiyangz@...rosoft.com>; Stephen Hemminger
>> <sthemmin@...rosoft.com>; bhelgaas@...gle.com
>> Cc: devel@...uxdriverproject.org; linux-pci@...r.kernel.org; linux-
>> kernel@...r.kernel.org; Jia-Ju Bai <baijiaju1990@...il.com>
>> Subject: [PATCH 1/2] pci: host: pci-hyperv: Replace GFP_ATOMIC with
>> GFP_KERNEL in hv_pci_onchannelcallback
>>
>> hv_pci_onchannelcallback() is not called in atomic context.
>>
>> The call chain ending up at hv_pci_onchannelcallback() is:
>> [1] hv_pci_onchannelcallback() <- hv_pci_probe()
>> hv_pci_probe() is only set as ".probe" in hv_driver
>> structure "hv_pci_drv".
> This function is setup as the function to handle interrupts on the channel. Hence the
> need for GFP_ATOMIC.
>

Oh, sorry for my incorrect patch.
Thanks for your reply :)


Best wishes,
Jia-Ju Bai