linux.git/fs/proc/task_mmu.c, branch v5.9

/proc/PID/smaps: consistent whitespace output format

2020-08-12T17:57:56+00:00

The keys in smaps output are padded to fixed width with spaces.  All
except for THPeligible that uses tabs (only since commit c06306696f83
("mm: thp: fix false negative of shmem vma's THP eligibility")).

Unify the output formatting to save time debugging some naïve parsers.
(Part of the unification is also aligning FilePmdMapped with others.)

Signed-off-by: Michal Koutný 
Signed-off-by: Andrew Morton 
Acked-by: Yang Shi 
Cc: Alexey Dobriyan 
Cc: Matthew Wilcox 
Link: http://lkml.kernel.org/r/20200728083207.17531-1-mkoutny@suse.com
Signed-off-by: Linus Torvalds

mmap locking API: convert mmap_sem comments

2020-06-09T16:39:14+00:00

Convert comments that reference mmap_sem to reference mmap_lock instead.

[akpm@linux-foundation.org: fix up linux-next leftovers]
[akpm@linux-foundation.org: s/lockaphore/lock/, per Vlastimil]
[akpm@linux-foundation.org: more linux-next fixups, per Michel]

Signed-off-by: Michel Lespinasse 
Signed-off-by: Andrew Morton 
Reviewed-by: Vlastimil Babka 
Reviewed-by: Daniel Jordan 
Cc: Davidlohr Bueso 
Cc: David Rientjes 
Cc: Hugh Dickins 
Cc: Jason Gunthorpe 
Cc: Jerome Glisse 
Cc: John Hubbard 
Cc: Laurent Dufour 
Cc: Liam Howlett 
Cc: Matthew Wilcox 
Cc: Peter Zijlstra 
Cc: Ying Han 
Link: http://lkml.kernel.org/r/20200520052908.204642-13-walken@google.com
Signed-off-by: Linus Torvalds

mmap locking API: use coccinelle to convert mmap_sem rwsem call sites

2020-06-09T16:39:14+00:00

This change converts the existing mmap_sem rwsem calls to use the new mmap
locking API instead.

The change is generated using coccinelle with the following rule:

// spatch --sp-file mmap_lock_api.cocci --in-place --include-headers --dir .

@@
expression mm;
@@
(
-init_rwsem
+mmap_init_lock
|
-down_write
+mmap_write_lock
|
-down_write_killable
+mmap_write_lock_killable
|
-down_write_trylock
+mmap_write_trylock
|
-up_write
+mmap_write_unlock
|
-downgrade_write
+mmap_write_downgrade
|
-down_read
+mmap_read_lock
|
-down_read_killable
+mmap_read_lock_killable
|
-down_read_trylock
+mmap_read_trylock
|
-up_read
+mmap_read_unlock
)
-(&mm->mmap_sem)
+(mm)

Signed-off-by: Michel Lespinasse 
Signed-off-by: Andrew Morton 
Reviewed-by: Daniel Jordan 
Reviewed-by: Laurent Dufour 
Reviewed-by: Vlastimil Babka 
Cc: Davidlohr Bueso 
Cc: David Rientjes 
Cc: Hugh Dickins 
Cc: Jason Gunthorpe 
Cc: Jerome Glisse 
Cc: John Hubbard 
Cc: Liam Howlett 
Cc: Matthew Wilcox 
Cc: Peter Zijlstra 
Cc: Ying Han 
Link: http://lkml.kernel.org/r/20200520052908.204642-5-walken@google.com
Signed-off-by: Linus Torvalds

Merge branch 'akpm' (patches from Andrew)

2020-06-02T19:21:36+00:00

Merge updates from Andrew Morton:
 "A few little subsystems and a start of a lot of MM patches.

  Subsystems affected by this patch series: squashfs, ocfs2, parisc,
  vfs. With mm subsystems: slab-generic, slub, debug, pagecache, gup,
  swap, memcg, pagemap, memory-failure, vmalloc, kasan"

* emailed patches from Andrew Morton : (128 commits)
  kasan: move kasan_report() into report.c
  mm/mm_init.c: report kasan-tag information stored in page->flags
  ubsan: entirely disable alignment checks under UBSAN_TRAP
  kasan: fix clang compilation warning due to stack protector
  x86/mm: remove vmalloc faulting
  mm: remove vmalloc_sync_(un)mappings()
  x86/mm/32: implement arch_sync_kernel_mappings()
  x86/mm/64: implement arch_sync_kernel_mappings()
  mm/ioremap: track which page-table levels were modified
  mm/vmalloc: track which page-table levels were modified
  mm: add functions to track page directory modifications
  s390: use __vmalloc_node in stack_alloc
  powerpc: use __vmalloc_node in alloc_vm_stack
  arm64: use __vmalloc_node in arch_alloc_vmap_stack
  mm: remove vmalloc_user_node_flags
  mm: switch the test_vmalloc module to use __vmalloc_node
  mm: remove __vmalloc_node_flags_caller
  mm: remove both instances of __vmalloc_node_flags
  mm: remove the prot argument to __vmalloc_node
  mm: remove the pgprot argument to __vmalloc
  ...

/proc/PID/smaps: Add PMD migration entry parsing

2020-06-02T17:59:10+00:00

Now, when reading /proc/PID/smaps, the PMD migration entry in page table
is simply ignored.  To improve the accuracy of /proc/PID/smaps, its
parsing and processing is added.

To test the patch, we run pmbench to eat 400 MB memory in background,
then run /usr/bin/migratepages and `cat /proc/PID/smaps` every second.
The issue as follows can be reproduced within 60 seconds.

Before the patch, for the fully populated 400 MB anonymous VMA, some THP
pages under migration may be lost as below.

  7f3f6a7e5000-7f3f837e5000 rw-p 00000000 00:00 0
  Size:             409600 kB
  KernelPageSize:        4 kB
  MMUPageSize:           4 kB
  Rss:              407552 kB
  Pss:              407552 kB
  Shared_Clean:          0 kB
  Shared_Dirty:          0 kB
  Private_Clean:         0 kB
  Private_Dirty:    407552 kB
  Referenced:       301056 kB
  Anonymous:        407552 kB
  LazyFree:              0 kB
  AnonHugePages:    405504 kB
  ShmemPmdMapped:        0 kB
  FilePmdMapped:        0 kB
  Shared_Hugetlb:        0 kB
  Private_Hugetlb:       0 kB
  Swap:                  0 kB
  SwapPss:               0 kB
  Locked:                0 kB
  THPeligible:		1
  VmFlags: rd wr mr mw me ac

After the patch, it will be always,

  7f3f6a7e5000-7f3f837e5000 rw-p 00000000 00:00 0
  Size:             409600 kB
  KernelPageSize:        4 kB
  MMUPageSize:           4 kB
  Rss:              409600 kB
  Pss:              409600 kB
  Shared_Clean:          0 kB
  Shared_Dirty:          0 kB
  Private_Clean:         0 kB
  Private_Dirty:    409600 kB
  Referenced:       294912 kB
  Anonymous:        409600 kB
  LazyFree:              0 kB
  AnonHugePages:    407552 kB
  ShmemPmdMapped:        0 kB
  FilePmdMapped:        0 kB
  Shared_Hugetlb:        0 kB
  Private_Hugetlb:       0 kB
  Swap:                  0 kB
  SwapPss:               0 kB
  Locked:                0 kB
  THPeligible:		1
  VmFlags: rd wr mr mw me ac

Signed-off-by: "Huang, Ying" 
Signed-off-by: Andrew Morton 
Reviewed-by: Zi Yan 
Acked-by: Michal Hocko 
Acked-by: Kirill A. Shutemov 
Acked-by: Vlastimil Babka 
Cc: Andrea Arcangeli 
Cc: Alexey Dobriyan 
Cc: Konstantin Khlebnikov 
Cc: "Jérôme Glisse" 
Cc: Yang Shi 
Link: http://lkml.kernel.org/r/20200403123059.1846960-1-ying.huang@intel.com
Signed-off-by: Linus Torvalds

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2020-06-01T22:18:27+00:00

Pull arm64 updates from Will Deacon:
"A sizeable pile of arm64 updates for 5.8.

Summary below, but the big two features are support for Branch Target
Identification and Clang's Shadow Call stack. The latter is currently
arm64-only, but the high-level parts are all in core code so it could
easily be adopted by other architectures pending toolchain support

Branch Target Identification (BTI):

- Support for ARMv8.5-BTI in both user- and kernel-space. This allows
branch targets to limit the types of branch from which they can be
called and additionally prevents branching to arbitrary code,
although kernel support requires a very recent toolchain.

- Function annotation via SYM_FUNC_START() so that assembly functions
are wrapped with the relevant "landing pad" instructions.

- BPF and vDSO updates to use the new instructions.

- Addition of a new HWCAP and exposure of BTI capability to userspace
via ID register emulation, along with ELF loader support for the
BTI feature in .note.gnu.property.

- Non-critical fixes to CFI unwind annotations in the sigreturn
trampoline.

Shadow Call Stack (SCS):

- Support for Clang's Shadow Call Stack feature, which reserves
platform register x18 to point at a separate stack for each task
that holds only return addresses. This protects function return
control flow from buffer overruns on the main stack.

- Save/restore of x18 across problematic boundaries (user-mode,
hypervisor, EFI, suspend, etc).

- Core support for SCS, should other architectures want to use it
too.

- SCS overflow checking on context-switch as part of the existing
stack limit check if CONFIG_SCHED_STACK_END_CHECK=y.

CPU feature detection:

- Removed numerous "SANITY CHECK" errors when running on a system
with mismatched AArch32 support at EL1. This is primarily a concern
for KVM, which disabled support for 32-bit guests on such a system.

- Addition of new ID registers and fields as the architecture has
been extended.

Perf and PMU drivers:

- Minor fixes and cleanups to system PMU drivers.

Hardware errata:

- Unify KVM workarounds for VHE and nVHE configurations.

- Sort vendor errata entries in Kconfig.

Secure Monitor Call Calling Convention (SMCCC):

- Update to the latest specification from Arm (v1.2).

- Allow PSCI code to query the SMCCC version.

Software Delegated Exception Interface (SDEI):

- Unexport a bunch of unused symbols.

- Minor fixes to handling of firmware data.

Pointer authentication:

- Add support for dumping the kernel PAC mask in vmcoreinfo so that
the stack can be unwound by tools such as kdump.

- Simplification of key initialisation during CPU bringup.

BPF backend:

- Improve immediate generation for logical and add/sub instructions.

vDSO:

- Minor fixes to the linker flags for consistency with other
architectures and support for LLVM's unwinder.

- Clean up logic to initialise and map the vDSO into userspace.

ACPI:

- Work around for an ambiguity in the IORT specification relating to
the "num_ids" field.

- Support _DMA method for all named components rather than only PCIe
root complexes.

- Minor other IORT-related fixes.

Miscellaneous:

- Initialise debug traps early for KGDB and fix KDB cacheflushing
deadlock.

- Minor tweaks to early boot state (documentation update, set
TEXT_OFFSET to 0x0, increase alignment of PE/COFF sections).

- Refactoring and cleanup"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (148 commits)
KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h
KVM: arm64: Check advertised Stage-2 page size capability
arm64/cpufeature: Add get_arm64_ftr_reg_nowarn()
ACPI/IORT: Remove the unused __get_pci_rid()
arm64/cpuinfo: Add ID_MMFR4_EL1 into the cpuinfo_arm64 context
arm64/cpufeature: Add remaining feature bits in ID_AA64PFR1 register
arm64/cpufeature: Add remaining feature bits in ID_AA64PFR0 register
arm64/cpufeature: Add remaining feature bits in ID_AA64ISAR0 register
arm64/cpufeature: Add remaining feature bits in ID_MMFR4 register
arm64/cpufeature: Add remaining feature bits in ID_PFR0 register
arm64/cpufeature: Introduce ID_MMFR5 CPU register
arm64/cpufeature: Introduce ID_DFR1 CPU register
arm64/cpufeature: Introduce ID_PFR2 CPU register
arm64/cpufeature: Make doublelock a signed feature in ID_AA64DFR0
arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register
arm64/cpufeature: Add explicit ftr_id_isar0[] for ID_ISAR0 register
arm64: mm: Add asid_gen_match() helper
firmware: smccc: Fix missing prototype warning for arm_smccc_version_init
arm64: vdso: Fix CFI directives in sigreturn trampoline
arm64: vdso: Don't prefix sigreturn trampoline with a BTI C instruction
...

Merge branch 'for-next/bti-user' into for-next/bti

2020-05-05T14:15:58+00:00

Merge in user support for Branch Target Identification, which narrowly
missed the cut for 5.7 after a late ABI concern.

* for-next/bti-user:
  arm64: bti: Document behaviour for dynamically linked binaries
  arm64: elf: Fix allnoconfig kernel build with !ARCH_USE_GNU_PROPERTY
  arm64: BTI: Add Kconfig entry for userspace BTI
  mm: smaps: Report arm64 guarded pages in smaps
  arm64: mm: Display guarded pages in ptdump
  KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions
  arm64: BTI: Reset BTYPE when skipping emulated instructions
  arm64: traps: Shuffle code to eliminate forward declarations
  arm64: unify native/compat instruction skipping
  arm64: BTI: Decode BYTPE bits when printing PSTATE
  arm64: elf: Enable BTI at exec based on ELF program properties
  elf: Allow arch to tweak initial mmap prot flags
  arm64: Basic Branch Target Identification support
  ELF: Add ELF program property parsing support
  ELF: UAPI and Kconfig additions for ELF program properties

mm: Remove MPX leftovers

2020-04-22T19:02:35+00:00

Remove MPX leftovers in generic code.

Fixes: 45fc24e89b7c ("x86/mpx: remove MPX from arch/x86")
Signed-off-by: Jimmy Assarsson 
Signed-off-by: Borislav Petkov 
Acked-by: Dave Hansen 
Link: https://lkml.kernel.org/r/20200402172507.2786-1-jimmyassarsson@gmail.com

proc: inline m_next_vma into m_next

2020-04-07T17:43:42+00:00

It's clearer to just put this inline.

Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Link: http://lkml.kernel.org/r/20200317193201.9924-5-adobriyan@gmail.com
Signed-off-by: Linus Torvalds

proc: use ppos instead of m->version

2020-04-07T17:43:42+00:00

The ppos is a private cursor, just like m->version.  Use the canonical
cursor, not a special one.

Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Link: http://lkml.kernel.org/r/20200317193201.9924-3-adobriyan@gmail.com
Signed-off-by: Linus Torvalds