kernel.git/arch/mips/mm/init.c, branch linux-4.5.y

mm: differentiate page_mapped() from page_mapcount() for compound pages

2016-01-16T01:56:32Z

Let's define page_mapped() to be true for compound pages if any sub-pages of the compound page is mapped (with PMD or PTE). On other hand page_mapcount() return mapcount for this particular small page. This will make cases like page_get_anon_vma() behave correctly once we allow huge pages to be mapped with PTE. Most users outside core-mm should use page_mapcount() instead of page_mapped(). Signed-off-by: Kirill A. Shutemov Tested-by: Sasha Levin Tested-by: Aneesh Kumar K.V Acked-by: Jerome Marchand Cc: Vlastimil Babka Cc: Andrea Arcangeli Cc: Hugh Dickins Cc: Dave Hansen Cc: Mel Gorman Cc: Rik van Riel Cc: Naoya Horiguchi Cc: Steve Capper Cc: Johannes Weiner Cc: Michal Hocko Cc: Christoph Lameter Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

MIPS: Initialise MAARs on secondary CPUs

2015-09-27T12:15:26Z

MAARs should be initialised on each CPU (or rather, core) in the system in order to achieve consistent behaviour & performance. Previously they have only been initialised on the boot CPU which leads to performance problems if tasks are later scheduled on a secondary CPU, particularly if those tasks make use of unaligned vector accesses where some CPUs don't handle any cases in hardware for non-speculative memory regions. Fix this by recording the MAAR configuration from the boot CPU and applying it to secondary CPUs as part of their bringup. Reported-by: Doug Gilmore Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: Rusty Russell Cc: Steven J. Hill Cc: Andrew Bresticker Cc: Bjorn Helgaas Cc: David Hildenbrand Cc: linux-kernel@vger.kernel.org Cc: Aaro Koskinen Cc: James Hogan Cc: Ingo Molnar Cc: Markos Chandras Cc: Hemmo Nieminen Cc: Alex Smith Cc: Peter Zijlstra (Intel) Patchwork: https://patchwork.linux-mips.org/patch/11239/ Signed-off-by: Ralf Baechle

MIPS: print MAAR configuration during boot

2015-09-27T12:14:47Z

Verifying that the MAAR configuration is as expected is useful when debugging the performance of a system. Print out the memory regions configured via MAAR along with their attributes. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: Steven J. Hill Cc: David Hildenbrand Cc: linux-kernel@vger.kernel.org Cc: Peter Zijlstra (Intel) Patchwork: https://patchwork.linux-mips.org/patch/11238/ Signed-off-by: Ralf Baechle

MIPS: mm: compile maar_init unconditionally

2015-09-27T12:14:00Z

maar_init was previously only compiled when CONFIG_NEED_MULTIPLE_NODES was not set, which has been fine since it is only called from the standard implementation of mem_init which has the same condition. In preparation for calling it from the SMP startup code on secondary CPUs, move maar_init outside of the #ifndef such that it is always compiled. Signed-off-by: Paul Burton Cc: Markos Chandras Cc: linux-mips@linux-mips.org Cc: Steven J. Hill Cc: David Hildenbrand Cc: linux-kernel@vger.kernel.org Cc: Ingo Molnar Patchwork: https://patchwork.linux-mips.org/patch/11237/ Signed-off-by: Ralf Baechle

MIPS: mm: default platform_maar_init using bootmem data

2015-09-03T10:07:40Z

Introduce a default weak implementation of platform_maar_init which makes use of the data that platforms already provide to the bootmem allocator. This should hopefully cover the most common configurations, reduce the duplication of information provided by platforms & leaves platforms with the option of providing a custom implementation if required. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: Paolo Bonzini Cc: Steven J. Hill Cc: linux-kernel@vger.kernel.org Cc: Ard Biesheuvel Patchwork: https://patchwork.linux-mips.org/patch/10676/ Signed-off-by: Ralf Baechle

sched/preempt, mm/kmap, MIPS: Disable preemption in kmap_coherent() explicitly

2015-05-19T06:39:15Z

k(un)map_coherent relies on pagefault_disable() to also disable preemption. Let's make this explicit, to prepare for pagefault_disable() not touching preemption anymore. This patch is based on a patch by Yang Shi on the -rt tree: "k{un}map_coherent are just called when cpu_has_dc_aliases == 1 with VIPT cache. However, actually, the most modern MIPS processors have PIPT dcache without dcache alias issue. In such case, k{un}map_atomic will be called with preempt enabled." Reviewed-and-tested-by: Thomas Gleixner Signed-off-by: David Hildenbrand Signed-off-by: Peter Zijlstra (Intel) Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-6-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar

MIPS: Add support for XPA.

2015-03-19T16:39:49Z

Add support for extended physical addressing (XPA) so that 32-bit platforms can access equal to or greater than 40 bits of physical addresses. NOTE: 1) XPA and EVA are not the same and cannot be used simultaneously. 2) If you configure your kernel for XPA, the PTEs and all address sizes become 64-bit. 3) Your platform MUST have working HIGHMEM support. Signed-off-by: Steven J. Hill Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9355/ Signed-off-by: Ralf Baechle

MIPS: Replace MIPS-specific 64BIT_PHYS_ADDR with generic PHYS_ADDR_T_64BIT

2014-11-24T21:46:44Z

Signed-off-by: Ralf Baechle

mm: export symbol dependencies of is_zero_pfn()

2014-09-14T14:25:14Z

In order to make the static inline function is_zero_pfn() callable by modules, export its symbol dependencies 'zero_pfn' and (for s390 and mips) 'zero_page_mask'. We need this for KVM, as CONFIG_KVM is a tristate for all supported architectures except ARM and arm64, and testing a pfn whether it refers to the zero page is required to correctly distinguish the zero page from other special RAM ranges that may also have the PG_reserved bit set, but need to be treated as MMIO memory. Signed-off-by: Ard Biesheuvel Acked-by: Andrew Morton Signed-off-by: Paolo Bonzini

MIPS: Initialise MAARs

2014-08-01T22:06:46Z

Add initialisation for Memory Accessibility Attribute Registers. Generic code cannot know the platform-specific requirements with regards to speculative accesses, so it simply calls a platform_maar_init function which platforms with MAARs are expected to implement by calling the provided write_maar_pair function & returning the number of MAAR pairs used. A weak default implementation will simply use no MAAR pairs. Any present but unused MAAR pairs are then marked invalid, effectively disabling them. The end result of this patch is that MAARs are all marked invalid, until platforms implement the platform_maar_init function. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7331/ Signed-off-by: Ralf Baechle