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0b0d81e3b7
linux/drivers/gpu/drm
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Josh Poimboeuf 0b0d81e3b7 objtool, drm/vmwgfx: Fix "duplicate frame pointer save" warning 
objtool reports the following warnings:

  drivers/gpu/drm/vmwgfx/vmwgfx_msg.o: warning: objtool: vmw_send_msg()+0x107: duplicate frame pointer save
  drivers/gpu/drm/vmwgfx/vmwgfx_msg.o: warning: objtool: vmw_host_get_guestinfo()+0x252: duplicate frame pointer save

To quote Linus:

 "The reason is that VMW_PORT_HB_OUT() uses a magic instruction sequence
  (a "rep outsb") to communicate with the hypervisor (it's a virtual GPU
  driver for vmware), and %rbp is part of the communication. So the
  inline asm does a save-and-restore of the frame pointer around the
  instruction sequence.

  I actually find the objtool warning to be quite reasonable, so it's
  not exactly a false positive, since in this case it actually does
  point out that the frame pointer won't be reliable over that
  instruction sequence.

  But in this particular case it just ends up being the wrong thing -
  the code is what it is, and %rbp just can't have the frame information
  due to annoying magic calling conventions."

Silence the warnings by telling objtool to ignore the two functions
which use the VMW_PORT_HB_{IN,OUT} macros.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: DRI <dri-devel@lists.freedesktop.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160526184343.fdtjjjg67smmeekt@treble
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-06-08 15:36:18 +02:00
..
amd Merge branch 'drm-next-4.7' of git://people.freedesktop.org/~agd5f/linux into drm-next 2016-05-27 16:03:48 +10:00
arc drm/arcpgu: use dedicated memory area for frame buffer 2016-04-29 14:22:32 +03:00
arm drm: hdlcd: Add information about the underlying framebuffers in debugfs 2016-06-02 17:45:55 +01:00
armada drm: Nuke ->vblank_disable_allowed 2016-05-21 07:03:31 +10:00
ast drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
atmel-hlcdc drm: atmel-hlcdc: fix a NULL check 2016-06-01 15:59:36 +02:00
bochs drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
bridge drm/bridge: Add Analogix anx78xx support 2016-05-12 11:32:14 +02:00
cirrus drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
etnaviv Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-05-23 11:48:48 -07:00
exynos drm: Nuke ->vblank_disable_allowed 2016-05-21 07:03:31 +10:00
fsl-dcu drm: Nuke ->vblank_disable_allowed 2016-05-21 07:03:31 +10:00
gma500 drm: Nuke ->vblank_disable_allowed 2016-05-21 07:03:31 +10:00
hisilicon drm/hisilicon: Fix DRM_INFO printed issue 2016-05-11 19:05:36 +08:00
i2c
i810
i915 Merge tag 'drm-fixes-v4.7-rc1' of git://people.freedesktop.org/~airlied/linux 2016-05-27 14:08:56 -07:00
imx drm/imx: plane: Don't set plane->crtc in ipu_plane_update() 2016-05-30 09:14:00 +02:00
mediatek drm/mediatek: mtk_dsi: Remove spurious drm_connector_unregister 2016-06-01 16:09:56 +02:00
mga
mgag200 drm/mgag200: Black screen fix for G200e rev 4 2016-06-01 15:25:04 +10:00
msm Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-05-23 11:48:48 -07:00
nouveau Merge branch 'linux-4.7' of git://github.com/skeggsb/linux into drm-next 2016-05-21 06:12:13 +10:00
omapdrm drm/omap: fix unused variable warning. 2016-06-03 14:39:41 +10:00
panel drm/panel: simple: Add support for TPK U.S.A. LLC Fusion 7" and 10.1" panels 2016-05-12 11:32:14 +02:00
qxl qxl: catch qxlfb_create_pinned_object failures 2016-05-17 09:11:23 +02:00
r128
radeon Merge branch 'drm-next-4.7' of git://people.freedesktop.org/~agd5f/linux into drm-next 2016-05-27 16:03:48 +10:00
rcar-du drm: Drop plane argument from __drm_atomic_helper_plane_destroy_state 2016-05-17 08:56:55 +02:00
rockchip drm: Nuke ->vblank_disable_allowed 2016-05-21 07:03:31 +10:00
savage
shmobile drm/shmobile: use drm_crtc_send_vblank_event() 2016-05-02 17:04:50 +02:00
sis
sti drm/sti: remove extra mode fixup 2016-06-01 14:59:44 +10:00
sun4i drm: sun4i: tv: Add NTSC output standard 2016-04-28 10:30:05 +02:00
tdfx
tegra Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-05-23 11:48:48 -07:00
tilcdc remove lots of IS_ERR_VALUE abuses 2016-05-27 15:26:11 -07:00
ttm Linux 4.6-rc7 2016-05-09 13:49:56 +10:00
udl drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
vc4 Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2016-05-23 11:48:48 -07:00
vgem drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
via
virtio drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
vmwgfx objtool, drm/vmwgfx: Fix "duplicate frame pointer save" warning 2016-06-08 15:36:18 +02:00
ati_pcigart.c
drm_agpsupport.c drm: Give drm_agp_clear drm_legacy_ prefix 2016-04-27 08:41:34 +02:00
drm_atomic_helper.c drm: Drop connector argument from __drm_atomic_helper_connector_destroy_state 2016-05-17 08:57:05 +02:00
drm_atomic.c drm: make drm_atomic_set_mode_prop_for_crtc() more reliable 2016-06-01 14:59:47 +10:00
drm_auth.c
drm_bridge.c
drm_bufs.c drm: Hide master MAP cleanup in drm_bufs.c 2016-04-27 10:14:17 +02:00
drm_cache.c
drm_context.c
drm_crtc_helper.c drm: Make drm_encoder_helper_funcs optional 2016-05-10 08:54:09 +02:00
drm_crtc_internal.h drm/mode: rework drm_mode_object_put to drm_mode_object_unregister. 2016-04-22 10:26:37 +10:00
drm_crtc.c drm: fix fb refcount issue with atomic modesetting 2016-06-01 15:00:05 +10:00
drm_debugfs.c
drm_dma.c
drm_dp_aux_dev.c drm/dp: Allow signals to interrupt drm_aux-dev reads/writes 2016-04-28 11:48:09 +02:00
drm_dp_dual_mode_helper.c drm: Add helper for DP++ adaptors 2016-05-23 11:10:46 +03:00
drm_dp_helper.c drm/dp_helper: Perform throw-away read before actual read in drm_dp_dpcd_read() 2016-04-22 18:52:24 +02:00
drm_dp_mst_topology.c Linux 4.6-rc7 2016-05-09 13:49:56 +10:00
drm_drv.c drm: Protect dev->filelist with its own mutex 2016-04-27 10:16:17 +02:00
drm_edid_load.c
drm_edid.c drm/edid: add displayid detailed 1 timings to the modelist. (v1.1) 2016-05-23 11:35:31 +10:00
drm_encoder_slave.c
drm_fb_cma_helper.c drm: Wrap direct calls to driver->gem_free_object from CMA 2016-06-01 15:00:28 +10:00
drm_fb_helper.c drm/fb_helper: Fix references to dev->mode_config.num_connector 2016-05-17 15:44:41 +02:00
drm_flip_work.c
drm_fops.c drm: Protect dev->filelist with its own mutex 2016-04-27 10:16:17 +02:00
drm_gem_cma_helper.c drm: Wrap direct calls to driver->gem_free_object from CMA 2016-06-01 15:00:28 +10:00
drm_gem.c drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
drm_global.c
drm_hashtab.c
drm_info.c drm: Protect dev->filelist with its own mutex 2016-04-27 10:16:17 +02:00
drm_internal.h drm: Make drm_vm_open/close_locked private to drm_vm.c 2016-04-27 10:15:56 +02:00
drm_ioc32.c
drm_ioctl.c drm: Move drm_getmap into drm_bufs.c and give it a legacy prefix 2016-04-27 08:42:48 +02:00
drm_irq.c drm: Nuke ->vblank_disable_allowed 2016-05-21 07:03:31 +10:00
drm_kms_helper_common.c
drm_legacy.h drm: Move drm_getmap into drm_bufs.c and give it a legacy prefix 2016-04-27 08:42:48 +02:00
drm_lock.c
drm_memory.c
drm_mipi_dsi.c
drm_mm.c
drm_modes.c drm: add missing drm_mode_set_crtcinfo call 2016-06-01 14:59:39 +10:00
drm_modeset_lock.c
drm_of.c
drm_panel.c drm/panel: Flesh out kerneldoc 2016-05-06 16:04:48 +02:00
drm_pci.c drm: Give drm_agp_clear drm_legacy_ prefix 2016-04-27 08:41:34 +02:00
drm_plane_helper.c
drm_platform.c
drm_prime.c drm: Remove unused drm_device from drm_gem_object_lookup() 2016-05-17 08:47:30 +02:00
drm_probe_helper.c drm: probe_helper: Hide ugly ifdef 2016-04-20 13:35:14 +02:00
drm_rect.c
drm_scatter.c
drm_sysfs.c drm/sysfs: Annote lockless show functions with READ_ONCE 2016-04-26 13:23:24 +02:00
drm_trace_points.c
drm_trace.h
drm_vm.c drm: Make drm_vm_open/close_locked private to drm_vm.c 2016-04-27 10:15:56 +02:00
drm_vma_manager.c
Kconfig drm/mediatek: Add DRM Driver for Mediatek SoC MT8173. 2016-05-06 17:47:35 +02:00
Makefile Merge tag 'drm-intel-next-fixes-2016-05-25' of git://anongit.freedesktop.org/drm-intel into drm-next 2016-05-27 16:08:38 +10:00