Josh Boyer 700870119f x86, efi: Don't map Boot Services on i386 ... Add patch to fix 32bit EFI service mapping (rhbz 726701) Multiple people are reporting hitting the following WARNING on i386, WARNING: at arch/x86/mm/ioremap.c:102 __ioremap_caller+0x3d3/0x440() Modules linked in: Pid: 0, comm: swapper Not tainted 3.9.0-rc7+ #95 Call Trace: [<c102b6af>] warn_slowpath_common+0x5f/0x80 [<c1023fb3>] ? __ioremap_caller+0x3d3/0x440 [<c1023fb3>] ? __ioremap_caller+0x3d3/0x440 [<c102b6ed>] warn_slowpath_null+0x1d/0x20 [<c1023fb3>] __ioremap_caller+0x3d3/0x440 [<c106007b>] ? get_usage_chars+0xfb/0x110 [<c102d937>] ? vprintk_emit+0x147/0x480 [<c1418593>] ? efi_enter_virtual_mode+0x1e4/0x3de [<c102406a>] ioremap_cache+0x1a/0x20 [<c1418593>] ? efi_enter_virtual_mode+0x1e4/0x3de [<c1418593>] efi_enter_virtual_mode+0x1e4/0x3de [<c1407984>] start_kernel+0x286/0x2f4 [<c1407535>] ? repair_env_string+0x51/0x51 [<c1407362>] i386_start_kernel+0x12c/0x12f Due to the workaround described in commit 916f676f8 ("x86, efi: Retain boot service code until after switching to virtual mode") EFI Boot Service regions are mapped for a period during boot. Unfortunately, with the limited size of the i386 direct kernel map it's possible that some of the Boot Service regions will not be directly accessible, which causes them to be ioremap()'d, triggering the above warning as the regions are marked as E820_RAM in the e820 memmap. There are currently only two situations where we need to map EFI Boot Service regions, 1. To workaround the firmware bug described in 916f676f8 2. To access the ACPI BGRT image but since we haven't seen an i386 implementation that requires either, this simple fix should suffice for now. [ Added to changelog - Matt ] Reported-by: Bryan O'Donoghue <bryan.odonoghue.lkml@nexus-software.ie> Acked-by: Tom Zanussi <tom.zanussi@intel.com> Acked-by: Darren Hart <dvhart@linux.intel.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: <stable@vger.kernel.org> Signed-off-by: Josh Boyer <jwboyer@redhat.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>		2013-09-18 14:42:33 +01:00
..
ce4100	arch/x86/platform/ce4100/ce4100.c: include reboot.h	2013-07-31 14:41:02 -07:00
efi	x86, efi: Don't map Boot Services on i386	2013-09-18 14:42:33 +01:00
geode	arch/x86/platform/geode/net5501.c: change active_low to 0 for LED driver	2012-05-04 14:40:07 -07:00
goldfish	goldfish: platform device for x86	2013-01-21 12:09:19 -08:00
iris	arch/x86/platform/iris/iris.c: register a platform device and a platform driver	2012-12-18 15:02:11 -08:00
mrst	gpio: (gpio-pca953x) move header to linux/platform_data/	2013-08-29 12:33:52 -07:00
olpc	x86/olpc/xo1/sci: Don't call input_free_device() after input_unregister_device()	2013-04-24 08:44:47 +02:00
scx200	X86: drivers: remove __dev* attributes.	2013-01-03 15:57:04 -08:00
sfi	x86: Convert a few mistaken __cpuinit annotations to __init	2013-01-24 17:12:19 +01:00
ts5500	x86: Add TS-5500 platform support	2013-01-25 19:40:23 +01:00
uv	x86/platform/uv: Replace kmalloc() & memset with kzalloc()	2013-03-11 08:33:01 +01:00
visws	x86/apic: Fix typo EIO_ACK -> EOI_ACK and document it	2012-05-18 09:46:07 +02:00
Makefile	x86: Add TS-5500 platform support	2013-01-25 19:40:23 +01:00