linux/arch/tile, branch v3.11.9

tile: use a more conservative __my_cpu_offset in CONFIG_PREEMPT

2013-10-14T01:14:32Z

commit f862eefec0b68e099a9fa58d3761ffb10bad97e1 upstream. It turns out the kernel relies on barrier() to force a reload of the percpu offset value. Since we can't easily modify the definition of barrier() to include "tp" as an output register, we instead provide a definition of __my_cpu_offset as extended assembly that includes a fake stack read to hazard against barrier(), forcing gcc to know that it must reread "tp" and recompute anything based on "tp" after a barrier. This fixes observed hangs in the slub allocator when we are looping on a percpu cmpxchg_double. A similar fix for ARMv7 was made in June in change 509eb76ebf97. Signed-off-by: Chris Metcalf Signed-off-by: Greg Kroah-Hartman

tile: delete __cpuinit usage from all tile files

2013-07-14T23:36:54Z

The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) are flagged as __cpuinit -- so if we remove the __cpuinit from arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. This removes all the arch/tile uses of the __cpuinit macros from all C files. Currently tile does not have any __CPUINIT used in assembly files. [1] https://lkml.org/lkml/2013/5/20/589 Cc: Chris Metcalf Signed-off-by: Paul Gortmaker

mm: remove free_area_cache

2013-07-11T01:11:34Z

Since all architectures have been converted to use vm_unmapped_area(), there is no remaining use for the free_area_cache. Signed-off-by: Michel Lespinasse Acked-by: Rik van Riel Cc: "James E.J. Bottomley" Cc: "Luck, Tony" Cc: Benjamin Herrenschmidt Cc: David Howells Cc: Helge Deller Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Paul Mackerras Cc: Richard Henderson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: invoke oom-killer from remaining unconverted page fault handlers

2013-07-09T17:33:20Z

A few remaining architectures directly kill the page faulting task in an out of memory situation. This is usually not a good idea since that task might not even use a significant amount of memory and so may not be the optimal victim to resolve the situation. Since 2.6.29's 1c0fe6e ("mm: invoke oom-killer from page fault") there is a hook that architecture page fault handlers are supposed to call to invoke the OOM killer and let it pick the right task to kill. Convert the remaining architectures over to this hook. To have the previous behavior of simply taking out the faulting task the vm.oom_kill_allocating_task sysctl can be set to 1. Signed-off-by: Johannes Weiner Reviewed-by: Michal Hocko Cc: KAMEZAWA Hiroyuki Acked-by: David Rientjes Acked-by: Vineet Gupta [arch/arc bits] Cc: James Hogan Cc: David Howells Cc: Jonas Bonn Cc: Chen Liqin Cc: Lennox Wu Cc: Chris Metcalf Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'kconfig-diet' from Dave Hansen

2013-07-04T18:25:51Z

Merge Kconfig menu diet patches from Dave Hansen: "I think the "Kernel Hacking" menu has gotten a bit out of hand. It is over 120 lines long on my system with everything enabled and options are scattered around it haphazardly. http://sr71.net/~dave/linux/kconfig-horror.png Let's try to introduce some sanity. This set takes that 120 lines down to 55 and makes it vastly easier to find some things. It's a start. This set stands on its own, but there is plenty of room for follow-up patches. The arch-specific debug options still end up getting stuck in the top-level "kernel hacking" menu. OPTIMIZE_INLINING, for instance, could obviously go in to the "compiler options" menu, but the fact that it is defined in arch/ in a separate Kconfig file keeps it on its own for the moment. The Signed-off-by's in here look funky. I changed employers while working on this set, so I have signoffs from both email addresses" * emailed patches from Dave Hansen : hang and lockup detection menu kconfig: consolidate printk options group locking debugging options consolidate compilation option configs consolidate runtime testing configs order memory debugging Kconfig options consolidate per-arch stack overflow debugging options

consolidate per-arch stack overflow debugging options

2013-07-04T18:25:39Z

Original posting: http://lkml.kernel.org/r/20121214184202.F54094D9@kernel.stglabs.ibm.com Several architectures have similar stack debugging config options. They all pretty much do the same thing, some with slightly differing help text. This patch changes the architectures to instead enable a Kconfig boolean, and then use that boolean in the generic Kconfig.debug to present the actual menu option. This removes a bunch of duplication and adds consistency across arches. Signed-off-by: Dave Hansen Reviewed-by: H. Peter Anvin Reviewed-by: James Hogan Acked-by: Chris Metcalf [for tile] Signed-off-by: Dave Hansen Signed-off-by: Linus Torvalds

mm/tile: prepare for removing num_physpages and simplify mem_init()

2013-07-03T23:07:37Z

Prepare for removing num_physpages and simplify mem_init(). Signed-off-by: Jiang Liu Acked-by: Chris Metcalf Cc: Bjorn Helgaas Cc: "David S. Miller" Cc: Wen Congyang Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tile: normalize global variables exported by vmlinux.lds

2013-07-03T23:07:34Z

Normalize global variables exported by vmlinux.lds to conform usage guidelines from include/asm-generic/sections.h. 1) Use _text to mark the start of the kernel image including the head text, and _stext to mark the start of the .text section. 2) Export mandatory global variables __init_begin and __init_end. Signed-off-by: Jiang Liu Acked-by: Chris Metcalf Cc: Rusty Russell Cc: Bjorn Helgaas Cc: "David S. Miller" Cc: Wen Congyang Cc: David Howells Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm: concentrate modification of totalram_pages into the mm core

2013-07-03T23:07:33Z

Concentrate code to modify totalram_pages into the mm core, so the arch memory initialized code doesn't need to take care of it. With these changes applied, only following functions from mm core modify global variable totalram_pages: free_bootmem_late(), free_all_bootmem(), free_all_bootmem_node(), adjust_managed_page_count(). With this patch applied, it will be much more easier for us to keep totalram_pages and zone->managed_pages in consistence. Signed-off-by: Jiang Liu Acked-by: David Howells Cc: "H. Peter Anvin" Cc: "Michael S. Tsirkin" Cc: Cc: Arnd Bergmann Cc: Catalin Marinas Cc: Chris Metcalf Cc: Geert Uytterhoeven Cc: Ingo Molnar Cc: Jeremy Fitzhardinge Cc: Jianguo Wu Cc: Joonsoo Kim Cc: Kamezawa Hiroyuki Cc: Konrad Rzeszutek Wilk Cc: Marek Szyprowski Cc: Mel Gorman Cc: Michel Lespinasse Cc: Minchan Kim Cc: Rik van Riel Cc: Rusty Russell Cc: Tang Chen Cc: Tejun Heo Cc: Thomas Gleixner Cc: Wen Congyang Cc: Will Deacon Cc: Yasuaki Ishimatsu Cc: Yinghai Lu Cc: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm/tile: use common help functions to free reserved pages

2013-07-03T23:07:33Z

Use common help functions to free reserved pages. Signed-off-by: Jiang Liu Cc: Chris Metcalf Cc: Wen Congyang Cc: "H. Peter Anvin" Cc: "Michael S. Tsirkin" Cc: Cc: Arnd Bergmann Cc: Catalin Marinas Cc: David Howells Cc: Geert Uytterhoeven Cc: Ingo Molnar Cc: Jeremy Fitzhardinge Cc: Jianguo Wu Cc: Joonsoo Kim Cc: Kamezawa Hiroyuki Cc: Konrad Rzeszutek Wilk Cc: Marek Szyprowski Cc: Mel Gorman Cc: Michel Lespinasse Cc: Minchan Kim Cc: Rik van Riel Cc: Rusty Russell Cc: Tang Chen Cc: Tejun Heo Cc: Thomas Gleixner Cc: Will Deacon Cc: Yasuaki Ishimatsu Cc: Yinghai Lu Cc: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds