linux.git/arch/openrisc, branch v5.4.64

openrisc: Fix oops caused when dumping stack

2020-08-21T11:05:35+00:00

[ Upstream commit 57b8e277c33620e115633cdf700a260b55095460 ]

When dumping a stack with 'cat /proc/#/stack' the kernel would oops.
For example:

    # cat /proc/690/stack
    Unable to handle kernel access
     at virtual address 0x7fc60f58

    Oops#: 0000
    CPU #: 0
       PC: c00097fc    SR: 0000807f    SP: d6f09b9c
    GPR00: 00000000 GPR01: d6f09b9c GPR02: d6f09bb8 GPR03: d6f09bc4
    GPR04: 7fc60f5c GPR05: c00099b4 GPR06: 00000000 GPR07: d6f09ba3
    GPR08: ffffff00 GPR09: c0009804 GPR10: d6f08000 GPR11: 00000000
    GPR12: ffffe000 GPR13: dbb86000 GPR14: 00000001 GPR15: dbb86250
    GPR16: 7fc60f63 GPR17: 00000f5c GPR18: d6f09bc4 GPR19: 00000000
    GPR20: c00099b4 GPR21: ffffffc0 GPR22: 00000000 GPR23: 00000000
    GPR24: 00000001 GPR25: 000002c6 GPR26: d78b6850 GPR27: 00000001
    GPR28: 00000000 GPR29: dbb86000 GPR30: ffffffff GPR31: dbb862fc
      RES: 00000000 oGPR11: ffffffff
    Process cat (pid: 702, stackpage=d79d6000)

    Stack:
    Call trace:
    [<598977f2>] save_stack_trace_tsk+0x40/0x74
    [<95063f0e>] stack_trace_save_tsk+0x44/0x58
    [] proc_pid_stack+0xd0/0x13c
    [] proc_single_show+0x6c/0xf0
    [] seq_read+0x1b4/0x688
    [<2d6c7480>] do_iter_read+0x208/0x248
    [<2182a2fb>] vfs_readv+0x64/0x90

This was caused by the stack trace code in save_stack_trace_tsk using
the wrong stack pointer.  It was using the user stack pointer instead of
the kernel stack pointer.  Fix this by using the right stack.

Also for good measure we add try_get_task_stack/put_task_stack to ensure
the task is not lost while we are walking it's stack.

Fixes: eecac38b0423a ("openrisc: support framepointers and STACKTRACE_SUPPORT")
Signed-off-by: Stafford Horne 
Signed-off-by: Sasha Levin

openrisc: Fix issue with argument clobbering for clone/fork

2020-06-24T15:50:37+00:00

[ Upstream commit 6bd140e14d9aaa734ec37985b8b20a96c0ece948 ]

Working on the OpenRISC glibc port I found that sometimes clone was
working strange.  That the tls data argument sent in r7 was always
wrong.  Further investigation revealed that the arguments were getting
clobbered in the entry code.  This patch removes the code that writes to
the argument registers.  This was likely due to some old code hanging
around.

This patch fixes this up for clone and fork.  This fork clobber is
harmless but also useless so remove.

Signed-off-by: Stafford Horne 
Signed-off-by: Sasha Levin

mm: treewide: clarify pgtable_page_{ctor,dtor}() naming

2019-09-26T17:10:44+00:00

The naming of pgtable_page_{ctor,dtor}() seems to have confused a few
people, and until recently arm64 used these erroneously/pointlessly for
other levels of page table.

To make it incredibly clear that these only apply to the PTE level, and to
align with the naming of pgtable_pmd_page_{ctor,dtor}(), let's rename them
to pgtable_pte_page_{ctor,dtor}().

These changes were generated with the following shell script:

----
git grep -lw 'pgtable_page_.tor' | while read FILE; do
    sed -i '{s/pgtable_page_ctor/pgtable_pte_page_ctor/}' $FILE;
    sed -i '{s/pgtable_page_dtor/pgtable_pte_page_dtor/}' $FILE;
done
----

... with the documentation re-flowed to remain under 80 columns, and
whitespace fixed up in macros to keep backslashes aligned.

There should be no functional change as a result of this patch.

Link: http://lkml.kernel.org/r/20190722141133.3116-1-mark.rutland@arm.com
Signed-off-by: Mark Rutland 
Reviewed-by: Mike Rapoport 
Acked-by: Geert Uytterhoeven 	[m68k]
Cc: Anshuman Khandual 
Cc: Matthew Wilcox 
Cc: Michal Hocko 
Cc: Yu Zhao 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: consolidate pgtable_cache_init() and pgd_cache_init()

2019-09-24T22:54:09+00:00

Both pgtable_cache_init() and pgd_cache_init() are used to initialize kmem
cache for page table allocations on several architectures that do not use
PAGE_SIZE tables for one or more levels of the page table hierarchy.

Most architectures do not implement these functions and use __weak default
NOP implementation of pgd_cache_init().  Since there is no such default
for pgtable_cache_init(), its empty stub is duplicated among most
architectures.

Rename the definitions of pgd_cache_init() to pgtable_cache_init() and
drop empty stubs of pgtable_cache_init().

Link: http://lkml.kernel.org/r/1566457046-22637-1-git-send-email-rppt@linux.ibm.com
Signed-off-by: Mike Rapoport 
Acked-by: Will Deacon 		[arm64]
Acked-by: Thomas Gleixner 	[x86]
Cc: Catalin Marinas 
Cc: Ingo Molnar 
Cc: Borislav Petkov 
Cc: Matthew Wilcox 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: remove quicklist page table caches

2019-09-24T22:54:09+00:00

Patch series "mm: remove quicklist page table caches".

A while ago Nicholas proposed to remove quicklist page table caches [1].

I've rebased his patch on the curren upstream and switched ia64 and sh to
use generic versions of PTE allocation.

[1] https://lore.kernel.org/linux-mm/20190711030339.20892-1-npiggin@gmail.com

This patch (of 3):

Remove page table allocator "quicklists".  These have been around for a
long time, but have not got much traction in the last decade and are only
used on ia64 and sh architectures.

The numbers in the initial commit look interesting but probably don't
apply anymore.  If anybody wants to resurrect this it's in the git
history, but it's unhelpful to have this code and divergent allocator
behaviour for minor archs.

Also it might be better to instead make more general improvements to page
allocator if this is still so slow.

Link: http://lkml.kernel.org/r/1565250728-21721-2-git-send-email-rppt@linux.ibm.com
Signed-off-by: Nicholas Piggin 
Signed-off-by: Mike Rapoport 
Cc: Tony Luck 
Cc: Yoshinori Sato 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

2019-09-21T17:07:42+00:00

Pull hmm updates from Jason Gunthorpe:
 "This is more cleanup and consolidation of the hmm APIs and the very
  strongly related mmu_notifier interfaces. Many places across the tree
  using these interfaces are touched in the process. Beyond that a
  cleanup to the page walker API and a few memremap related changes
  round out the series:

   - General improvement of hmm_range_fault() and related APIs, more
     documentation, bug fixes from testing, API simplification &
     consolidation, and unused API removal

   - Simplify the hmm related kconfigs to HMM_MIRROR and DEVICE_PRIVATE,
     and make them internal kconfig selects

   - Hoist a lot of code related to mmu notifier attachment out of
     drivers by using a refcount get/put attachment idiom and remove the
     convoluted mmu_notifier_unregister_no_release() and related APIs.

   - General API improvement for the migrate_vma API and revision of its
     only user in nouveau

   - Annotate mmu_notifiers with lockdep and sleeping region debugging

  Two series unrelated to HMM or mmu_notifiers came along due to
  dependencies:

   - Allow pagemap's memremap_pages family of APIs to work without
     providing a struct device

   - Make walk_page_range() and related use a constant structure for
     function pointers"

* tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (75 commits)
  libnvdimm: Enable unit test infrastructure compile checks
  mm, notifier: Catch sleeping/blocking for !blockable
  kernel.h: Add non_block_start/end()
  drm/radeon: guard against calling an unpaired radeon_mn_unregister()
  csky: add missing brackets in a macro for tlb.h
  pagewalk: use lockdep_assert_held for locking validation
  pagewalk: separate function pointers from iterator data
  mm: split out a new pagewalk.h header from mm.h
  mm/mmu_notifiers: annotate with might_sleep()
  mm/mmu_notifiers: prime lockdep
  mm/mmu_notifiers: add a lockdep map for invalidate_range_start/end
  mm/mmu_notifiers: remove the __mmu_notifier_invalidate_range_start/end exports
  mm/hmm: hmm_range_fault() infinite loop
  mm/hmm: hmm_range_fault() NULL pointer bug
  mm/hmm: fix hmm_range_fault()'s handling of swapped out pages
  mm/mmu_notifiers: remove unregister_no_release
  RDMA/odp: remove ib_ucontext from ib_umem
  RDMA/odp: use mmu_notifier_get/put for 'struct ib_ucontext_per_mm'
  RDMA/mlx5: Use odp instead of mr->umem in pagefault_mr
  RDMA/mlx5: Use ib_umem_start instead of umem.address
  ...

pagewalk: separate function pointers from iterator data

2019-09-07T07:28:04+00:00

The mm_walk structure currently mixed data and code.  Split out the
operations vectors into a new mm_walk_ops structure, and while we are
changing the API also declare the mm_walk structure inside the
walk_page_range and walk_page_vma functions.

Based on patch from Linus Torvalds.

Link: https://lore.kernel.org/r/20190828141955.22210-3-hch@lst.de
Signed-off-by: Christoph Hellwig 
Reviewed-by: Thomas Hellstrom 
Reviewed-by: Steven Price 
Reviewed-by: Jason Gunthorpe 
Signed-off-by: Jason Gunthorpe

mm: split out a new pagewalk.h header from mm.h

2019-09-07T07:28:04+00:00

Add a new header for the two handful of users of the walk_page_range /
walk_page_vma interface instead of polluting all users of mm.h with it.

Link: https://lore.kernel.org/r/20190828141955.22210-2-hch@lst.de
Signed-off-by: Christoph Hellwig 
Reviewed-by: Thomas Hellstrom 
Reviewed-by: Steven Price 
Reviewed-by: Jason Gunthorpe 
Signed-off-by: Jason Gunthorpe

openrisc: map as uncached in ioremap

2019-08-31T02:57:53+00:00

Openrisc is the only architecture not mapping ioremap as uncached,
which has been the default since the Linux 2.6.x days.  Switch it
over to implement uncached semantics by default.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Stafford Horne

or1k: dts: Add ethoc device to SMP devicetree

2019-08-31T02:56:19+00:00

This patch adds the ethoc device configuration to the OpenRISC basic SMP
device tree config.  This was tested with qemu.

Signed-off-by: Stafford Horne