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    Subject[PATCH] [85/275] drm/i915: Add dependency on CONFIG_TMPFS
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    2.6.35-longterm review patch.  If anyone has any objections, please let me know.

    ------------------
    From: Chris Wilson <chris@chris-wilson.co.uk>

    commit f7ab9b407b3bc83161c2aa74c992ba4782e87c9c upstream.

    Without tmpfs, shmem_readpage() is not compiled in causing an OOPS as
    soon as we try to allocate some swappable pages for GEM.

    Jan 19 22:52:26 harlie kernel: Modules linked in: i915(+) drm_kms_helper cfbcopyarea video backlight cfbimgblt cfbfillrect
    Jan 19 22:52:26 harlie kernel:
    Jan 19 22:52:26 harlie kernel: Pid: 1125, comm: modprobe Not tainted 2.6.37Harlie #10 To be filled by O.E.M./To be filled by O.E.M.
    Jan 19 22:52:26 harlie kernel: EIP: 0060:[<00000000>] EFLAGS: 00010246 CPU: 3
    Jan 19 22:52:26 harlie kernel: EIP is at 0x0
    Jan 19 22:52:26 harlie kernel: EAX: 00000000 EBX: f7b7d000 ECX: f3383100 EDX: f7b7d000
    Jan 19 22:52:26 harlie kernel: ESI: f1456118 EDI: 00000000 EBP: f2303c98 ESP: f2303c7c
    Jan 19 22:52:26 harlie kernel: DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    Jan 19 22:52:26 harlie kernel: Process modprobe (pid: 1125, ti=f2302000 task=f259cd80 task.ti=f2302000)
    Jan 19 22:52:26 harlie kernel: Stack:
    Jan 19 22:52:26 harlie udevd-work[1072]: '/sbin/modprobe -b pci:v00008086d00000046sv00000000sd00000000bc03sc00i00' unexpected exit with status 0x0009
    Jan 19 22:52:26 harlie kernel: c1074061 000000d0 f2f42b80 00000000 000a13d2 f2d5dcc0 00000001 f2303cac
    Jan 19 22:52:26 harlie kernel: c107416f 00000000 000a13d2 00000000 f2303cd4 f8d620ed f2cee620 00001000
    Jan 19 22:52:26 harlie kernel: 00000000 000a13d2 f1456118 f2d5dcc0 f1a40000 00001000 f2303d04 f8d637ab
    Jan 19 22:52:26 harlie kernel: Call Trace:
    Jan 19 22:52:26 harlie kernel: [<c1074061>] ? do_read_cache_page+0x71/0x160
    Jan 19 22:52:26 harlie kernel: [<c107416f>] ? read_cache_page_gfp+0x1f/0x30
    Jan 19 22:52:26 harlie kernel: [<f8d620ed>] ? i915_gem_object_get_pages+0xad/0x1d0 [i915]
    Jan 19 22:52:26 harlie kernel: [<f8d637ab>] ? i915_gem_object_bind_to_gtt+0xeb/0x2d0 [i915]
    Jan 19 22:52:26 harlie kernel: [<f8d65961>] ? i915_gem_object_pin+0x151/0x190 [i915]
    Jan 19 22:52:26 harlie kernel: [<c11e16ed>] ? drm_gem_object_init+0x3d/0x60
    Jan 19 22:52:26 harlie kernel: [<f8d65aa5>] ? i915_gem_init_ringbuffer+0x105/0x1e0 [i915]
    Jan 19 22:52:26 harlie kernel: [<f8d571b7>] ? i915_driver_load+0x667/0x1160 [i915]

    Reported-by: John J. Stimson-III <john@idsfa.net>
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    drivers/gpu/drm/Kconfig | 3 +++
    1 file changed, 3 insertions(+)

    Index: linux-2.6.35.y/drivers/gpu/drm/Kconfig
    ===================================================================
    --- linux-2.6.35.y.orig/drivers/gpu/drm/Kconfig 2011-03-29 22:51:36.191797111 -0700
    +++ linux-2.6.35.y/drivers/gpu/drm/Kconfig 2011-03-29 23:02:59.909302491 -0700
    @@ -96,7 +96,10 @@
    config DRM_I915
    tristate "i915 driver"
    depends on AGP_INTEL
    + # we need shmfs for the swappable backing store, and in particular
    + # the shmem_readpage() which depends upon tmpfs
    select SHMEM
    + select TMPFS
    select DRM_KMS_HELPER
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA

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