kernel_optimize_test/arch/x86
Daniel Drake d55e37bb0f x86: Don't clear olpc_ofw_header when sentinel is detected
OpenFirmware wasn't quite following the protocol described in boot.txt
and the kernel has detected this through use of the sentinel value
in boot_params. OFW does zero out almost all of the stuff that it should
do, but not the sentinel.

This causes the kernel to clear olpc_ofw_header, which breaks x86 OLPC
support.

OpenFirmware has now been fixed. However, it would be nice if we could
maintain Linux compatibility with old firmware versions. To do that, we just
have to avoid zeroing out olpc_ofw_header.

OFW does not write to any other parts of the header that are being zapped
by the sentinel-detection code, and all users of olpc_ofw_header are
somewhat protected through checking for the OLPC_OFW_SIG magic value
before using it. So this should not cause any problems for anyone.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/20130809221420.618E6FAB03@dev.laptop.org
Acked-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org> # v3.9+
2013-08-09 15:29:48 -07:00
..
boot x86, efi: correct call to free_pages 2013-07-26 15:22:32 +01:00
configs x86, platform, kvm, kconfig: Turn existing .config's into KVM-capable configs 2013-05-28 12:11:32 +02:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2013-07-24 11:05:18 -07:00
ia32 mm: remove free_area_cache 2013-07-10 18:11:34 -07:00
include x86: Don't clear olpc_ofw_header when sentinel is detected 2013-08-09 15:29:48 -07:00
kernel Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-08-06 13:18:52 -07:00
kvm KVM: MMU: avoid fast page fault fixing mmio page fault 2013-07-18 12:26:57 +02:00
lguest Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-06 14:09:38 -07:00
lib Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS 2013-04-30 17:04:09 -07:00
math-emu
mm x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
net x86: bpf_jit_comp: secure bpf jit against spraying attacks 2013-05-19 23:55:41 -07:00
oprofile
pci x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
platform arch/x86/platform/ce4100/ce4100.c: include reboot.h 2013-07-31 14:41:02 -07:00
power x86, gdt, hibernate: Store/load GDT for hibernate path. 2013-05-02 11:27:35 -07:00
realmode x86, relocs: Refactor the relocs tool to merge 32- and 64-bit ELF 2013-04-16 16:02:58 -07:00
syscalls unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
tools x86, relocs: Move __vvar_page from S_ABS to S_REL 2013-06-12 15:14:57 -07:00
um um: remove dead code 2013-07-19 11:35:32 +02:00
vdso x86/vdso: Convert use of typedef ctl_table to struct ctl_table 2013-06-19 15:06:09 +02:00
video
xen x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
.gitignore
Kbuild
Kconfig arm: add support for LZ4-compressed kernel 2013-07-09 10:33:30 -07:00
Kconfig.cpu
Kconfig.debug Merge branch 'kconfig-diet' from Dave Hansen 2013-07-04 11:25:51 -07:00
Makefile x86/platform: Add kvmconfig to the phony targets 2013-06-23 12:17:35 +02:00
Makefile_32.cpu
Makefile.um