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    SubjectRe: drm: add helper to clflush a virtual address range
    Hi Daniel,

    I see you say you wanted the patch below for the stable tree, due to
    some later patch needing it, yet this patch was not "marked" for the
    stable tree, and I can't seem to figure out which "later patch" you are
    referring to here.

    Any hints on what I should do for the 3.4-stable kernel tree with this?

    thanks,

    greg k-h

    On Thu, May 24, 2012 at 07:55:29PM +0000, Linux Kernel Mailing List wrote:
    > Gitweb: http://git.kernel.org/linus/;a=commit;h=6d5cd9cb1e32e4f4e4468704430b26bcb0bfb129
    > Commit: 6d5cd9cb1e32e4f4e4468704430b26bcb0bfb129
    > Parent: dbf7bff074d5fdc87c61b1b41d8e809109cf0bf8
    > Author: Daniel Vetter <daniel.vetter@ffwll.ch>
    > AuthorDate: Sun Mar 25 19:47:30 2012 +0200
    > Committer: Daniel Vetter <daniel.vetter@ffwll.ch>
    > CommitDate: Tue Mar 27 13:19:45 2012 +0200
    >
    > drm: add helper to clflush a virtual address range
    >
    > Useful when the page is already mapped to copy date in/out.
    >
    > For -stable because the next patch (fixing phys obj pwrite) needs this
    > little helper function.
    >
    > Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
    > Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
    > Cc: dri-devel@lists.freedesktop.org
    > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    > ---
    > drivers/gpu/drm/drm_cache.c | 23 +++++++++++++++++++++++
    > include/drm/drmP.h | 1 +
    > 2 files changed, 24 insertions(+), 0 deletions(-)
    >
    > diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
    > index 5928653..c7c8f6b 100644
    > --- a/drivers/gpu/drm/drm_cache.c
    > +++ b/drivers/gpu/drm/drm_cache.c
    > @@ -98,3 +98,26 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
    > #endif
    > }
    > EXPORT_SYMBOL(drm_clflush_pages);
    > +
    > +void
    > +drm_clflush_virt_range(char *addr, unsigned long length)
    > +{
    > +#if defined(CONFIG_X86)
    > + if (cpu_has_clflush) {
    > + char *end = addr + length;
    > + mb();
    > + for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
    > + clflush(addr);
    > + clflush(end - 1);
    > + mb();
    > + return;
    > + }
    > +
    > + if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
    > + printk(KERN_ERR "Timed out waiting for cache flush.\n");
    > +#else
    > + printk(KERN_ERR "Architecture has no drm_cache.c support\n");
    > + WARN_ON_ONCE(1);
    > +#endif
    > +}
    > +EXPORT_SYMBOL(drm_clflush_virt_range);
    > diff --git a/include/drm/drmP.h b/include/drm/drmP.h
    > index 92f0981..d33597b 100644
    > --- a/include/drm/drmP.h
    > +++ b/include/drm/drmP.h
    > @@ -1332,6 +1332,7 @@ extern int drm_remove_magic(struct drm_master *master, drm_magic_t magic);
    >
    > /* Cache management (drm_cache.c) */
    > void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
    > +void drm_clflush_virt_range(char *addr, unsigned long length);
    >
    > /* Locking IOCTL support (drm_lock.h) */
    > extern int drm_lock(struct drm_device *dev, void *data,
    > --
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