linux.git/arch/x86/kernel/setup.c, branch v3.17

arch/x86: Replace plain strings with constants

2014-07-18T20:23:59+00:00

We've got constants, so let's use them instead of hard-coded values.

Signed-off-by: Daniel Kiper 
Signed-off-by: Matt Fleming

cma: add placement specifier for "cma=" kernel parameter

2014-06-04T23:53:57+00:00

Currently, "cma=" kernel parameter is used to specify the size of CMA,
but we can't specify where it is located.  We want to locate CMA below
4GB for devices only supporting 32-bit addressing on 64-bit systems
without iommu.

This enables to specify the placement of CMA by extending "cma=" kernel
parameter.

Examples:
 1. locate 64MB CMA below 4GB by "cma=64M@0-4G"
 2. locate 64MB CMA exact at 512MB by "cma=64M@512M"

Note that the DMA contiguous memory allocator on x86 assumes that
page_address() works for the pages to allocate.  So this change requires
to limit end address of contiguous memory area upto max_pfn_mapped to
prevent from locating it on highmem area by the argument of
dma_contiguous_reserve().

Signed-off-by: Akinobu Mita 
Cc: Marek Szyprowski 
Cc: Konrad Rzeszutek Wilk 
Cc: David Woodhouse 
Cc: Don Dutile 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Cc: Andi Kleen 
Cc: Yinghai Lu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'x86-nuke-platforms-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-04-02T20:15:58+00:00

Pull x86 old platform removal from Peter Anvin:
 "This patchset removes support for several completely obsolete
  platforms, where the maintainers either have completely vanished or
  acked the removal.  For some of them it is questionable if there even
  exists functional specimens of the hardware"

Geert Uytterhoeven apparently thought this was a April Fool's pull request ;)

* 'x86-nuke-platforms-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, platforms: Remove NUMAQ
  x86, platforms: Remove SGI Visual Workstation
  x86, apic: Remove support for IBM Summit/EXA chipset
  x86, apic: Remove support for ia32-based Unisys ES7000

Merge remote-tracking branch 'tip/x86/urgent' into efi-for-mingo

2014-03-05T17:31:41+00:00

Conflicts:
	arch/x86/include/asm/efi.h

x86/efi: Quirk out SGI UV

2014-03-04T23:43:33+00:00

Alex reported hitting the following BUG after the EFI 1:1 virtual
mapping work was merged,

 kernel BUG at arch/x86/mm/init_64.c:351!
 invalid opcode: 0000 [#1] SMP
 Call Trace:
  [] init_extra_mapping_uc+0x13/0x15
  [] uv_system_init+0x22b/0x124b
  [] ? clockevents_register_device+0x138/0x13d
  [] ? setup_APIC_timer+0xc5/0xc7
  [] ? clockevent_delta2ns+0xb/0xd
  [] ? setup_boot_APIC_clock+0x4a8/0x4b7
  [] ? printk+0x72/0x74
  [] native_smp_prepare_cpus+0x389/0x3d6
  [] kernel_init_freeable+0xb7/0x1fb
  [] ? rest_init+0x74/0x74
  [] kernel_init+0x9/0xff
  [] ret_from_fork+0x7c/0xb0
  [] ? rest_init+0x74/0x74

Getting this thing to work with the new mapping scheme would need more
work, so automatically switch to the old memmap layout for SGI UV.

Acked-by: Russ Anderson 
Cc: Alex Thorlton 
Signed-off-by: Matt Fleming

efi: Move facility flags to struct efi

2014-03-04T16:16:16+00:00

As we grow support for more EFI architectures they're going to want the
ability to query which EFI features are available on the running system.
Instead of storing this information in an architecture-specific place,
stick it in the global 'struct efi', which is already the central
location for EFI state.

While we're at it, let's change the return value of efi_enabled() to be
bool and replace all references to 'facility' with 'feature', which is
the usual word used to describe the attributes of the running system.

Signed-off-by: Matt Fleming

x86, platforms: Remove SGI Visual Workstation

2014-02-27T16:07:39+00:00

The SGI Visual Workstation seems to be dead; remove support so we
don't have to continue maintaining it.

Cc: Andrey Panin 
Cc: Michael Reed 
Link: http://lkml.kernel.org/r/530CFD6C.7040705@zytor.com
Signed-off-by: H. Peter Anvin

x86: revert wrong memblock current limit setting

2014-01-28T05:02:38+00:00

Dave reported big numa system booting is broken.

It turns out that commit 5b6e529521d3 ("x86: memblock: set current limit
to max low memory address") sets the limit to low wrongly.

max_low_pfn_mapped is different from max_pfn_mapped.
max_low_pfn_mapped is always under 4G.

That will memblock_alloc_nid all go under 4G.

Revert 5b6e529521d3 to fix a no-boot regression which was triggered by
457ff1de2d24 ("lib/swiotlb.c: use memblock apis for early memory
allocations").

Signed-off-by: Yinghai Lu 
Reported-by: Dave Hansen 
Acked-by: Santosh Shilimkar 
Cc: Russell King 
Cc: Konrad Rzeszutek Wilk 
Cc: Ingo Molnar 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

x86: memblock: set current limit to max low memory address

2014-01-22T00:19:46+00:00

The memblock current limit value is used to limit early boot memory
allocations below max low memory address by default, as the kernel can
access only to the low memory.

Hence, set memblock current limit value to the max mapped low memory
address instead of max mapped memory address.

Signed-off-by: Santosh Shilimkar 
Cc: Tejun Heo 
Cc: Grygorii Strashko 
Cc: Yinghai Lu 
Cc: "Rafael J. Wysocki" 
Cc: Arnd Bergmann 
Cc: Christoph Lameter 
Cc: Greg Kroah-Hartman 
Cc: H. Peter Anvin 
Cc: Johannes Weiner 
Cc: KAMEZAWA Hiroyuki 
Cc: Konrad Rzeszutek Wilk 
Cc: Michal Hocko 
Cc: Paul Walmsley 
Cc: Pavel Machek 
Cc: Russell King 
Cc: Tony Lindgren 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-01-20T22:45:50+00:00

Pull x86 kernel address space randomization support from Peter Anvin:
 "This enables kernel address space randomization for x86"

* 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, kaslr: Clarify RANDOMIZE_BASE_MAX_OFFSET
  x86, kaslr: Remove unused including 
  x86, kaslr: Use char array to gain sizeof sanity
  x86, kaslr: Add a circular multiply for better bit diffusion
  x86, kaslr: Mix entropy sources together as needed
  x86/relocs: Add percpu fixup for GNU ld 2.23
  x86, boot: Rename get_flags() and check_flags() to *_cpuflags()
  x86, kaslr: Raise the maximum virtual address to -1 GiB on x86_64
  x86, kaslr: Report kernel offset on panic
  x86, kaslr: Select random position from e820 maps
  x86, kaslr: Provide randomness functions
  x86, kaslr: Return location from decompress_kernel
  x86, boot: Move CPU flags out of cpucheck
  x86, relocs: Add more per-cpu gold special cases