kernel-fxtec-pro1x/arch/x86
David Herrmann 29d274b8d3 x86/simplefb: Mark framebuffer mem-resources as IORESOURCE_BUSY to avoid bootup warning
IORESOURCE_BUSY is used to mark temporary driver mem-resources
instead of global regions. This suppresses warnings if regions
overlap with a region marked as BUSY.

This was always the case for VESA/VGA/EFI framebuffer regions so
do the same for simplefb regions. The reason we do this is to
allow device handover to real GPU drivers like
i915/radeon/nouveau which get the same regions via PCI BARs.

Maybe at some point we will be able to unregister platform
devices properly during the handover. In this case the simplefb
region would get removed before the new region is created.
However, this is currently not the case and would require rather
huge changes in remove_conflicting_framebuffers(). Add the BUSY
marker now and try to eventually rewrite the handover for a next release.

Also see kernel/resource.c for more information:

  /*
   * if a resource is "BUSY", it's not a hardware resource
   * but a driver mapping of such a resource; we don't want
   * to warn for those; some drivers legitimately map only
   * partial hardware resources. (example: vesafb)
   */

This suppresses warnings like:

  ------------[ cut here ]------------
  WARNING: CPU: 2 PID: 199 at arch/x86/mm/ioremap.c:171 __ioremap_caller+0x2e3/0x390()
  Info: mapping multiple BARs. Your kernel is fine.
  Call Trace:
    dump_stack+0x54/0x8d
    warn_slowpath_common+0x7d/0xa0
    warn_slowpath_fmt+0x4c/0x50
    iomem_map_sanity_check+0xac/0xe0
    __ioremap_caller+0x2e3/0x390
    ioremap_wc+0x32/0x40
    i915_driver_load+0x670/0xf50 [i915]
    ...

Reported-by: Tom Gundersen <teg@jklm.no>
Tested-by: Tom Gundersen <teg@jklm.no>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Link: http://lkml.kernel.org/r/1380724864-1757-1-git-send-email-dh.herrmann@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-10-03 07:51:11 +02:00
..
boot Merge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-04 09:38:10 -07:00
configs x86, platform, kvm, kconfig: Turn existing .config's into KVM-capable configs 2013-05-28 12:11:32 +02:00
crypto Reinstate "crypto: crct10dif - Wrap crc_t10dif function all to use crypto transform framework" 2013-09-07 12:56:26 +10:00
ia32 Merge branch 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-04 11:08:32 -07:00
include Bug-fixes: 2013-09-25 15:50:53 -07:00
kernel x86/simplefb: Mark framebuffer mem-resources as IORESOURCE_BUSY to avoid bootup warning 2013-10-03 07:51:11 +02:00
kvm KVM: VMX: set "blocked by NMI" flag if EPT violation happens during IRET from NMI 2013-09-17 19:09:47 +03:00
lguest lguest: fix GPF in guest when using gdb. 2013-09-06 08:09:28 +09:30
lib Merge branch 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-04 11:08:32 -07:00
math-emu
mm x86: finish user fault error path with fatal signal 2013-09-12 15:38:01 -07:00
net x86: bpf_jit_comp: secure bpf jit against spraying attacks 2013-05-19 23:55:41 -07:00
oprofile oprofilefs_create_...() do not need superblock argument 2013-09-03 22:52:48 -04:00
pci PCI changes for the v3.12 merge window: 2013-09-03 16:24:35 -07:00
platform x86, efi: Don't map Boot Services on i386 2013-09-18 14:42:33 +01:00
power x86, asmlinkage, power: Make various symbols used by the suspend asm code visible 2013-08-06 14:21:03 -07:00
realmode
syscalls
tools Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-04 08:39:38 -07:00
um um: prctl: Do not include linux/ptrace.h 2013-09-07 10:57:11 +02:00
vdso remove sched notifier for cross-cpu migrations 2013-07-18 12:29:30 +02:00
video
xen Bug-fixes: 2013-09-25 15:50:53 -07:00
.gitignore
Kbuild
Kconfig Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-18 11:26:17 -05:00
Kconfig.cpu
Kconfig.debug Merge branch 'kconfig-diet' from Dave Hansen 2013-07-04 11:25:51 -07:00
Makefile x86, relocs: Move ELF relocation handling to C 2013-08-07 21:00:04 -07:00
Makefile.um
Makefile_32.cpu