Messages in this thread | | | From | KY Srinivasan <> | Subject | RE: [PATCH 1/3]: Staging: hv: Use native page allocation/free functions | Date | Fri, 11 Feb 2011 20:55:56 +0000 |
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> -----Original Message----- > From: Greg KH [mailto:gregkh@suse.de] > Sent: Friday, February 11, 2011 1:30 PM > To: KY Srinivasan > Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org; > virtualization@lists.osdl.org; Hank Janssen > Subject: Re: [PATCH 1/3]: Staging: hv: Use native page allocation/free functions > > On Fri, Feb 11, 2011 at 09:59:00AM -0800, K. Y. Srinivasan wrote: > > --- a/drivers/staging/hv/hv.c > > +++ b/drivers/staging/hv/hv.c > > @@ -230,7 +230,12 @@ int hv_init(void) > > * Allocate the hypercall page memory > > * virtaddr = osd_page_alloc(1); > > */ > > - virtaddr = osd_virtual_alloc_exec(PAGE_SIZE); > > +#ifdef __x86_64__ > > + virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC); > #else > > + virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, > > + __pgprot(__PAGE_KERNEL & (~_PAGE_NX))); #endif > > I'm not saying this patch is wrong at all, but I still don't understand why this is > different depending on the architecture of the machine. Why is this necessary, it > should be ok to do the same type of allocation no matter what the processor is, > right?
You are right Greg; I don't think there is a need to specify different page protection bits based on the architecture - PAGE_KERNEL_EXEC should be enough. However, this is the code that is currently in the tree - refer to osd.c. If it is ok with you, I could submit an additional patch to clean this up.
Regards,
K. Y > > thanks, > > greg k-h
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