linux-kernel - Re: [PATCH -next] habanalabs: use GFP

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Date:   Fri, 22 Feb 2019 08:44:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     Wei Yongjun <weiyongjun1@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH -next] habanalabs: use GFP_ATOMIC under spin lock

On Fri, Feb 22, 2019 at 09:11:17AM +0200, Oded Gabbay wrote:
> On Fri, Feb 22, 2019 at 9:04 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Fri, Feb 22, 2019 at 05:46:01AM +0000, Wei Yongjun wrote:
> > > A spin lock is taken here so we should use GFP_ATOMIC.
> > >
> > > Fixes: 0feaf86d4e69 ("habanalabs: add virtual memory and MMU modules")
> > > Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> > > ---
> > >  drivers/misc/habanalabs/memory.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/misc/habanalabs/memory.c b/drivers/misc/habanalabs/memory.c
> > > index 9236e52852c6..9e3491dc3b55 100644
> > > --- a/drivers/misc/habanalabs/memory.c
> > > +++ b/drivers/misc/habanalabs/memory.c
> > > @@ -120,7 +120,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
> > >
> > >       spin_lock(&vm->idr_lock);
> > >       handle = idr_alloc(&vm->phys_pg_pack_handles, phys_pg_pack, 1, 0,
> > > -                             GFP_KERNEL);
> > > +                             GFP_ATOMIC);
> > >       spin_unlock(&vm->idr_lock);
> > >
> > >       if (handle < 0) {
> > >
> > >
> > >
> >
> > Ah, nice catch!
> >
> > Oded, any objection to me taking this patch?
> >
> > greg k-h
> No, of course not.
> This patch is:
> Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>

Great, will go queue it up now, thanks.

greg k-h