17 Oct, 2020
11 commits
-
With highmem, pte_alloc_map() keep the level4 page table mapped using
kmap_atomic(). Avoid doing new memory allocation with page table mapped
like above.[ 9.409233] BUG: sleeping function called from invalid context at mm/page_alloc.c:4822
[ 9.410557] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper
[ 9.411932] no locks held by swapper/1.
[ 9.412595] CPU: 0 PID: 1 Comm: swapper Not tainted 5.9.0-rc3-00323-gc50eb1ed654b5 #2
[ 9.413824] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 9.415207] Call Trace:
[ 9.415651] ? ___might_sleep.cold+0xa7/0xcc
[ 9.416367] ? __alloc_pages_nodemask+0x14c/0x5b0
[ 9.417055] ? swap_migration_tests+0x50/0x293
[ 9.417704] ? debug_vm_pgtable+0x4bc/0x708
[ 9.418287] ? swap_migration_tests+0x293/0x293
[ 9.418911] ? do_one_initcall+0x82/0x3cb
[ 9.419465] ? parse_args+0x1bd/0x280
[ 9.419983] ? rcu_read_lock_sched_held+0x36/0x60
[ 9.420673] ? trace_initcall_level+0x1f/0xf3
[ 9.421279] ? trace_initcall_level+0xbd/0xf3
[ 9.421881] ? do_basic_setup+0x9d/0xdd
[ 9.422410] ? do_basic_setup+0xc3/0xdd
[ 9.422938] ? kernel_init_freeable+0x72/0xa3
[ 9.423539] ? rest_init+0x134/0x134
[ 9.424055] ? kernel_init+0x5/0x12c
[ 9.424574] ? ret_from_fork+0x19/0x30Reported-by: kernel test robot
Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Link: https://lkml.kernel.org/r/20200913110327.645310-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
pte_clear_tests operate on an existing pte entry. Make sure that is not a
none pte entry.[aneesh.kumar@linux.ibm.com: avoid kernel crash with riscv]
Link: https://lkml.kernel.org/r/20201015033206.140550-1-aneesh.kumar@linux.ibm.comSigned-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Reviewed-by: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Cc: Nathan Chancellor
Cc: Guenter Roeck
Cc: Paul Walmsley
Cc: Albert Ou
Cc: Palmer Dabbelt
Link: https://lkml.kernel.org/r/20200902114222.181353-14-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
The seems to be missing quite a lot of details w.r.t allocating the
correct pgtable_t page (huge_pte_alloc()), holding the right lock
(huge_pte_lock()) etc. The vma used is also not a hugetlb VMA.ppc64 do have runtime checks within CONFIG_DEBUG_VM for most of these.
Hence disable the test on ppc64.[anshuman.khandual@arm.com: drop hugetlb_advanced_tests()]
Link: https://lore.kernel.org/lkml/289c3fdb-1394-c1af-bdc4-5542907089dc@linux.ibm.com/#t
Link: https://lkml.kernel.org/r/1600914446-21890-1-git-send-email-anshuman.khandual@arm.comSigned-off-by: Aneesh Kumar K.V
Signed-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-13-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
pmd_clear() should not be used to clear pmd level pte entries.
Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Cc: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-12-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
Architectures like ppc64 use deposited page table while updating the huge
pte entries.Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Reviewed-by: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-11-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
Make sure we call pte accessors with correct lock held.
Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Cc: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-10-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
This will help in adding proper locks in a later patch
Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Cc: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-9-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
set_pte_at() should not be used to set a pte entry at locations that
already holds a valid pte entry. Architectures like ppc64 don't do TLB
invalidate in set_pte_at() and hence expect it to be used to set locations
that are not a valid PTE.Link: https://lkml.kernel.org/r/20200902114222.181353-8-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V
Reviewed-by: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Saved write support was added to track the write bit of a pte after
marking the pte protnone. This was done so that AUTONUMA can convert a
write pte to protnone and still track the old write bit. When converting
it back we set the pte write bit correctly thereby avoiding a write fault
again. Hence enable the test only when CONFIG_NUMA_BALANCING is enabled
and use protnone protflags.Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Reviewed-by: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-6-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
ppc64 supports huge vmap only with radix translation. Hence use arch
helper to determine the huge vmap support.Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Reviewed-by: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-5-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds -
ppc64 use bit 62 to indicate a pte entry (_PAGE_PTE). Avoid setting that
bit in random value.Signed-off-by: Aneesh Kumar K.V
Signed-off-by: Andrew Morton
Reviewed-by: Anshuman Khandual
Cc: Christophe Leroy
Cc: Michael Ellerman
Link: https://lkml.kernel.org/r/20200902114222.181353-4-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds
08 Aug, 2020
4 commits
-
This adds a specific description file for all arch page table helpers which
is in sync with the semantics being tested via CONFIG_DEBUG_VM_PGTABLE. All
future changes either to these descriptions here or the debug test should
always remain in sync.[anshuman.khandual@arm.com: fold in Mike's patch for the rst document, fix typos in the rst document]
Link: http://lkml.kernel.org/r/1594610587-4172-5-git-send-email-anshuman.khandual@arm.comSuggested-by: Mike Rapoport
Signed-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Acked-by: Mike Rapoport
Cc: Jonathan Corbet
Cc: Mike Rapoport
Cc: Vineet Gupta
Cc: Catalin Marinas
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Heiko Carstens
Cc: Vasily Gorbik
Cc: Christian Borntraeger
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Kirill A. Shutemov
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Cc: Zi Yan
Link: http://lkml.kernel.org/r/1593996516-7186-5-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds -
This adds debug print information that enlists all tests getting executed
on a given platform. With dynamic debug enabled, the following
information will be splashed during boot. For compactness purpose,
dropped both time stamp and prefix (i.e debug_vm_pgtable) from this sample
output.[debug_vm_pgtable ]: Validating architecture page table helpers
[pte_basic_tests ]: Validating PTE basic
[pmd_basic_tests ]: Validating PMD basic
[p4d_basic_tests ]: Validating P4D basic
[pgd_basic_tests ]: Validating PGD basic
[pte_clear_tests ]: Validating PTE clear
[pmd_clear_tests ]: Validating PMD clear
[pte_advanced_tests ]: Validating PTE advanced
[pmd_advanced_tests ]: Validating PMD advanced
[hugetlb_advanced_tests]: Validating HugeTLB advanced
[pmd_leaf_tests ]: Validating PMD leaf
[pmd_huge_tests ]: Validating PMD huge
[pte_savedwrite_tests ]: Validating PTE saved write
[pmd_savedwrite_tests ]: Validating PMD saved write
[pmd_populate_tests ]: Validating PMD populate
[pte_special_tests ]: Validating PTE special
[pte_protnone_tests ]: Validating PTE protnone
[pmd_protnone_tests ]: Validating PMD protnone
[pte_devmap_tests ]: Validating PTE devmap
[pmd_devmap_tests ]: Validating PMD devmap
[pte_swap_tests ]: Validating PTE swap
[swap_migration_tests ]: Validating swap migration
[hugetlb_basic_tests ]: Validating HugeTLB basic
[pmd_thp_tests ]: Validating PMD based THPSigned-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Tested-by: Vineet Gupta [arc]
Reviewed-by: Zi Yan
Cc: Catalin Marinas
Cc: Mike Rapoport
Cc: Vineet Gupta
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Heiko Carstens
Cc: Vasily Gorbik
Cc: Christian Borntraeger
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Kirill A. Shutemov
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Cc: Jonathan Corbet
Cc: Mike Rapoport
Link: http://lkml.kernel.org/r/1593996516-7186-4-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds -
This adds new tests validating for these following arch advanced page
table helpers. These tests create and test specific mapping types at
various page table levels.1. pxxp_set_wrprotect()
2. pxxp_get_and_clear()
3. pxxp_set_access_flags()
4. pxxp_get_and_clear_full()
5. pxxp_test_and_clear_young()
6. pxx_leaf()
7. pxx_set_huge()
8. pxx_(clear|mk)_savedwrite()
9. huge_pxxp_xxx()[anshuman.khandual@arm.com: drop RANDOM_ORVALUE from hugetlb_advanced_tests()]
Link: http://lkml.kernel.org/r/1594610587-4172-3-git-send-email-anshuman.khandual@arm.comSuggested-by: Catalin Marinas
Signed-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Tested-by: Vineet Gupta [arc]
Reviewed-by: Zi Yan
Cc: Mike Rapoport
Cc: Vineet Gupta
Cc: Catalin Marinas
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Heiko Carstens
Cc: Vasily Gorbik
Cc: Christian Borntraeger
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Kirill A. Shutemov
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Cc: Jonathan Corbet
Cc: Mike Rapoport
Cc: Steven Price
Link: http://lkml.kernel.org/r/1593996516-7186-3-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds -
Patch series "mm/debug_vm_pgtable: Add some more tests", v5.
This series adds some more arch page table helper validation tests which
are related to core and advanced memory functions. This also creates a
documentation, enlisting expected semantics for all page table helpers as
suggested by Mike Rapoport previously
(https://lkml.org/lkml/2020/1/30/40).There are many TRANSPARENT_HUGEPAGE and ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD
ifdefs scattered across the test. But consolidating all the fallback
stubs is not very straight forward because
ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD is not explicitly dependent on
ARCH_HAS_TRANSPARENT_HUGEPAGE.Tested on arm64, x86 platforms but only build tested on all other enabled
platforms through ARCH_HAS_DEBUG_VM_PGTABLE i.e powerpc, arc, s390. The
following failure on arm64 still exists which was mentioned previously.
It will be fixed with the upcoming THP migration on arm64 enablement
series.WARNING .... mm/debug_vm_pgtable.c:860 debug_vm_pgtable+0x940/0xa54
WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))))This patch (of 4):
This adds new tests validating arch page table helpers for these following
core memory features. These tests create and test specific mapping types
at various page table levels.1. SPECIAL mapping
2. PROTNONE mapping
3. DEVMAP mapping
4. SOFTDIRTY mapping
5. SWAP mapping
6. MIGRATION mapping
7. HUGETLB mapping
8. THP mappingSuggested-by: Catalin Marinas
Signed-off-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Tested-by: Vineet Gupta [arc]
Reviewed-by: Zi Yan
Cc: Mike Rapoport
Cc: Vineet Gupta
Cc: Catalin Marinas
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Heiko Carstens
Cc: Vasily Gorbik
Cc: Christian Borntraeger
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Kirill A. Shutemov
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Cc: Jonathan Corbet
Cc: Mike Rapoport
Cc: Steven Price
Link: http://lkml.kernel.org/r/1594610587-4172-1-git-send-email-anshuman.khandual@arm.com
Link: http://lkml.kernel.org/r/1593996516-7186-1-git-send-email-anshuman.khandual@arm.com
Link: http://lkml.kernel.org/r/1593996516-7186-2-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds
17 Jul, 2020
1 commit
-
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings (e.g.
"unused variable"). If the compiler thinks it is uninitialized, either
simply initialize the variable or make compiler changes. As a precursor
to removing[2] this[3] macro[4], just initialize this variable to NULL.[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/Fixes: 399145f9eb6c ("mm/debug: add tests validating architecture page table helpers")
Reviewed-by: Nick Desaulniers
Signed-off-by: Kees Cook
26 Jun, 2020
1 commit
-
Since commit 9e343b467c70 ("READ_ONCE: Enforce atomicity for
{READ,WRITE}_ONCE() memory accesses"), READ_ONCE() cannot be used
anymore to read complex page table entries.This leads to:
CC mm/debug_vm_pgtable.o
In file included from ./include/asm-generic/bug.h:5,
from ./arch/powerpc/include/asm/bug.h:109,
from ./include/linux/bug.h:5,
from ./include/linux/mmdebug.h:5,
from ./include/linux/gfp.h:5,
from mm/debug_vm_pgtable.c:13:
In function 'pte_clear_tests',
inlined from 'debug_vm_pgtable' at mm/debug_vm_pgtable.c:363:2:
./include/linux/compiler.h:392:38: error: Unsupported access size for {READ,WRITE}_ONCE().
mm/debug_vm_pgtable.c:249:14: note: in expansion of macro 'READ_ONCE'
249 | pte_t pte = READ_ONCE(*ptep);
| ^~~~~~~~~
make[2]: *** [mm/debug_vm_pgtable.o] Error 1Fix it by using the recently added ptep_get() helper.
Link: http://lkml.kernel.org/r/6ca8c972e6c920dc4ae0d4affbed9703afa4d010.1592490570.git.christophe.leroy@csgroup.eu
Fixes: 9e343b467c70 ("READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses")
Signed-off-by: Christophe Leroy
Acked-by: Will Deacon
Reviewed-by: Anshuman Khandual
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: "Peter Zijlstra (Intel)"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
11 Jun, 2020
1 commit
-
Architectures can have CONFIG_TRANSPARENT_HUGEPAGE enabled but no THP
support enabled based on platforms. For ex: with 4K PAGE_SIZE ppc64
supports THP only with radix translation.This results in below crash when running with hash translation and 4K
PAGE_SIZE.kernel BUG at arch/powerpc/include/asm/book3s/64/hash-4k.h:140!
cpu 0x61: Vector: 700 (Program Check) at [c000000ff948f860]
pc: debug_vm_pgtable+0x480/0x8b0
lr: debug_vm_pgtable+0x474/0x8b0
...
debug_vm_pgtable+0x374/0x8b0 (unreliable)
do_one_initcall+0x98/0x4f0
kernel_init_freeable+0x330/0x3fc
kernel_init+0x24/0x148Check for THP support correctly
Link: http://lkml.kernel.org/r/20200608125252.407659-1-aneesh.kumar@linux.ibm.com
Fixes: 399145f9eb6c ("mm/debug: add tests validating architecture page table helpers")
Signed-off-by: Aneesh Kumar K.V
Reviewed-by: Anshuman Khandual
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
10 Jun, 2020
1 commit
-
Patch series "mm: consolidate definitions of page table accessors", v2.
The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once. For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.Most of these definitions are actually identical and typically it boils
down to, e.g.static inline unsigned long pmd_index(unsigned long address)
{
return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.This patch (of 12):
The linux/mm.h header includes to allow inlining of the
functions involving page table manipulations, e.g. pte_alloc() and
pmd_alloc(). So, there is no point to explicitly include
in the files that include .The include statements in such cases are remove with a simple loop:
for f in $(git grep -l "include ") ; do
sed -i -e '/include / d' $f
doneSigned-off-by: Mike Rapoport
Signed-off-by: Andrew Morton
Cc: Arnd Bergmann
Cc: Borislav Petkov
Cc: Brian Cain
Cc: Catalin Marinas
Cc: Chris Zankel
Cc: "David S. Miller"
Cc: Geert Uytterhoeven
Cc: Greentime Hu
Cc: Greg Ungerer
Cc: Guan Xuetao
Cc: Guo Ren
Cc: Heiko Carstens
Cc: Helge Deller
Cc: Ingo Molnar
Cc: Ley Foon Tan
Cc: Mark Salter
Cc: Matthew Wilcox
Cc: Matt Turner
Cc: Max Filippov
Cc: Michael Ellerman
Cc: Michal Simek
Cc: Mike Rapoport
Cc: Nick Hu
Cc: Paul Walmsley
Cc: Richard Weinberger
Cc: Rich Felker
Cc: Russell King
Cc: Stafford Horne
Cc: Thomas Bogendoerfer
Cc: Thomas Gleixner
Cc: Tony Luck
Cc: Vincent Chen
Cc: Vineet Gupta
Cc: Will Deacon
Cc: Yoshinori Sato
Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org
Signed-off-by: Linus Torvalds
05 Jun, 2020
1 commit
-
This adds tests which will validate architecture page table helpers and
other accessors in their compliance with expected generic MM semantics.
This will help various architectures in validating changes to existing
page table helpers or addition of new ones.This test covers basic page table entry transformations including but not
limited to old, young, dirty, clean, write, write protect etc at various
level along with populating intermediate entries with next page table page
and validating them.Test page table pages are allocated from system memory with required size
and alignments. The mapped pfns at page table levels are derived from a
real pfn representing a valid kernel text symbol. This test gets called
via late_initcall().This test gets built and run when CONFIG_DEBUG_VM_PGTABLE is selected.
Any architecture, which is willing to subscribe this test will need to
select ARCH_HAS_DEBUG_VM_PGTABLE. For now this is limited to arc, arm64,
x86, s390 and powerpc platforms where the test is known to build and run
successfully Going forward, other architectures too can subscribe the test
after fixing any build or runtime problems with their page table helpers.Folks interested in making sure that a given platform's page table helpers
conform to expected generic MM semantics should enable the above config
which will just trigger this test during boot. Any non conformity here
will be reported as an warning which would need to be fixed. This test
will help catch any changes to the agreed upon semantics expected from
generic MM and enable platforms to accommodate it thereafter.[anshuman.khandual@arm.com: v17]
Link: http://lkml.kernel.org/r/1587436495-22033-3-git-send-email-anshuman.khandual@arm.com
[anshuman.khandual@arm.com: v18]
Link: http://lkml.kernel.org/r/1588564865-31160-3-git-send-email-anshuman.khandual@arm.com
Suggested-by: Catalin Marinas
Signed-off-by: Anshuman Khandual
Signed-off-by: Christophe Leroy
Signed-off-by: Qian Cai
Signed-off-by: Andrew Morton
Tested-by: Gerald Schaefer [s390]
Tested-by: Christophe Leroy [ppc32]
Reviewed-by: Ingo Molnar
Cc: Mike Rapoport
Cc: Vineet Gupta
Cc: Catalin Marinas
Cc: Will Deacon
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michael Ellerman
Cc: Heiko Carstens
Cc: Vasily Gorbik
Cc: Christian Borntraeger
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Borislav Petkov
Cc: "H. Peter Anvin"
Cc: Kirill A. Shutemov
Cc: Paul Walmsley
Cc: Palmer Dabbelt
Link: http://lkml.kernel.org/r/1583919272-24178-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds