linux-kernel - Re: [PATCH 1/4] xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL in pcistub

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Message-ID: <7096e165-3f2b-3c81-f59a-c9a96cef22ef@oracle.com>
Date:   Wed, 11 Apr 2018 22:16:12 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Jia-Ju Bai <baijiaju1990@...il.com>, jgross@...e.com,
        gregkh@...uxfoundation.org
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] xen: xen-pciback: Replace GFP_ATOMIC with GFP_KERNEL
 in pcistub_probe



On 04/09/2018 11:03 AM, Jia-Ju Bai wrote:
> pcistub_probe() is never called in atomic context.
> This function is only set as ".probe" in struct pci_driver.
> 
> Despite never getting called from atomic context,
> pcistub_probe() calls kmalloc() with GFP_ATOMIC,
> which does not sleep for allocation.
> GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
> which can sleep and improve the possibility of sucessful allocation.
> 
> This is found by a static analysis tool named DCNS written by myself.
> And I also manually check it.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>

For all 5 patches:

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>