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From: Christoph Hellwig <hch@lst.de>
To: boris.ostrovsky@oracle.com
Cc: Christoph Hellwig <hch@lst.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
	x86@kernel.org, xen-devel@lists.xenproject.org,
	linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org, linux-mm@kvack.org
Subject: Re: [PATCH 6/6] x86/xen: open code alloc_vm_area in arch_gnttab_valloc
Date: Tue, 22 Sep 2020 17:27:06 +0200	[thread overview]
Message-ID: <20200922152706.GA30633@lst.de> (raw)
In-Reply-To: <ebd69ba1-fc06-3cc7-348e-3cb0004c2a34@oracle.com>

On Tue, Sep 22, 2020 at 11:24:20AM -0400, boris.ostrovsky@oracle.com wrote:
> 
> On 9/22/20 10:58 AM, Christoph Hellwig wrote:
> > On Mon, Sep 21, 2020 at 04:44:10PM -0400, boris.ostrovsky@oracle.com wrote:
> >> This will end up incrementing area->ptes pointer. So perhaps something like
> >>
> >>
> >> pte_t **ptes = area->ptes;
> >>
> >> if (apply_to_page_range(&init_mm, (unsigned long)area->area->addr,
> >>                         PAGE_SIZE * nr_frames, gnttab_apply, &ptes)) {
> >>
> >>        ...
> > Yeah.  What do you think of this version? 
> 
> 
> Oh yes, this is way better. This now can actually be read without trying to mentally unwind triple pointers. (You probably want to initialize idx to zero before calling apply_to_page_range(), I am not sure it's guaranteed to be zero).

Both instances are static variables, thus in .bss and initialized.
So unless you insist I don't think we need a manual one.

  reply	other threads:[~2020-09-22 15:27 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 16:37 remove alloc_vm_area Christoph Hellwig
2020-09-18 16:37 ` [PATCH 1/6] zsmalloc: switch from alloc_vm_area to get_vm_area Christoph Hellwig
2020-09-21 17:42   ` Minchan Kim
2020-09-21 18:17     ` Christoph Hellwig
2020-09-21 18:42       ` Minchan Kim
2020-09-21 18:43         ` Christoph Hellwig
2020-09-18 16:37 ` [PATCH 2/6] mm: add a vmap_pfn function Christoph Hellwig
2020-09-18 16:37 ` [PATCH 3/6] drm/i915: use vmap in shmem_pin_map Christoph Hellwig
2020-09-21 19:11   ` Matthew Wilcox
2020-09-22  6:22     ` Christoph Hellwig
2020-09-22  8:23       ` [Intel-gfx] " Tvrtko Ursulin
2020-09-22 14:31         ` Christoph Hellwig
     [not found]           ` <e429c3e6-2143-f51a-4c1c-c1470076ad3e@linux.intel.com>
2020-09-22 16:33             ` Christoph Hellwig
     [not found]               ` <1b05b9d6-a14c-85cd-0728-d0d40c9ff84b@linux.intel.com>
2020-09-23  6:11                 ` Christoph Hellwig
2020-09-22 11:21       ` Matthew Wilcox
2020-09-22 14:39         ` Christoph Hellwig
2020-09-22 14:53           ` Matthew Wilcox
2020-09-18 16:37 ` [PATCH 4/6] drm/i915: use vmap in i915_gem_object_map Christoph Hellwig
2020-09-23  9:52   ` [Intel-gfx] " Tvrtko Ursulin
2020-09-23 13:41     ` Christoph Hellwig
2020-09-23 13:58       ` Tvrtko Ursulin
2020-09-23 14:44         ` Christoph Hellwig
2020-09-24 12:22           ` Tvrtko Ursulin
2020-09-24 13:23             ` Christoph Hellwig
2020-09-18 16:37 ` [PATCH 5/6] xen/xenbus: use apply_to_page_range directly in xenbus_map_ring_pv Christoph Hellwig
2020-09-18 16:37 ` [PATCH 6/6] x86/xen: open code alloc_vm_area in arch_gnttab_valloc Christoph Hellwig
2020-09-21 20:44   ` boris.ostrovsky
2020-09-22 14:58     ` Christoph Hellwig
2020-09-22 15:24       ` boris.ostrovsky
2020-09-22 15:27         ` Christoph Hellwig [this message]
2020-09-22 15:34           ` boris.ostrovsky

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