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fbdev: Drop FBINFO_CAN_FORCE_OUTPUT flag 

This was only added for the drm's fbdev emulation support, so that it
would try harder to show the Oops.

Unfortunately this never really worked reliably, and in practice ended
up pushing the real Oops off the screen due to plentyfull locking,
sleep-while-atomic and other issues. So we removed all that support
from the fbdev emulation a while back. Aside: We've also removed the
kgdb support, for similar reasons.

Since it's such a small patch I figured I don't split this up into the
usual 3-phase removal.

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Alexander Kapshuk <alexander.kapshuk@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Thierry Reding <treding@nvidia.com>
Cc: David Lechner <david@lechnology.com>
Cc: nouveau@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180822085405.10787-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2018-08-22 10:54:02 +02:00
parent 1f86fa1534
commit 04cfcc7ab3
4 changed files with 1 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/nouveau/nouveau_fbcon.c
View File

@ -379,7 +379,6 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,
info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA |
FBINFO_HWACCEL_FILLRECT |
FBINFO_HWACCEL_IMAGEBLIT;
info->flags |= FBINFO_CAN_FORCE_OUTPUT;
info->fbops = &nouveau_fbcon_sw_ops;
info->fix.smem_start = fb->nvbo->bo.mem.bus.base +
fb->nvbo->bo.mem.bus.offset;

3
drivers/staging/vboxvideo/vbox_fb.c
View File

@ -155,8 +155,7 @@ static int vboxfb_create(struct drm_fb_helper *helper,
* The last flag forces a mode set on VT switches even if the kernel
* does not think it is needed.
*/
info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT |
FBINFO_MISC_ALWAYS_SETPAR;
info->flags = FBINFO_DEFAULT | FBINFO_MISC_ALWAYS_SETPAR;
info->fbops = &vboxfb_ops;
/*

1
drivers/video/fbdev/core/fbcon.c
View File

@ -1104,7 +1104,6 @@ static void fbcon_init(struct vc_data *vc, int init)
if (p->userfont)
charcnt = FNTCHARCNT(p->fontdata);
vc->vc_panic_force_write = !!(info->flags & FBINFO_CAN_FORCE_OUTPUT);
vc->vc_can_do_color = (fb_get_color_depth(&info->var, &info->fix)!=1);
vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
if (charcnt == 256) {

4
include/linux/fb.h
View File

@ -457,10 +457,6 @@ struct fb_tile_ops {
*/
#define FBINFO_BE_MATH 0x100000
/* report to the VT layer that this fb driver can accept forced console
output like oopses */
#define FBINFO_CAN_FORCE_OUTPUT 0x200000
struct fb_info {
atomic_t count;
int node;