linux.git/arch/sparc/include/asm, branch v6.9

Merge tag 'sparc-for-6.9-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/alarsson/linux-sparc

2024-03-15T19:47:21+00:00

Pull sparc updates from Andreas Larsson:

 - Fix missing prototype warnings in various places, including switching
   to using generic cmpdi2/ucmpdi2 and parport.h and stop selecting
   unneeded GENERIC_ISA_DMA.

 - Reduce duplicate code by using shared font data, with dependency
   fixup in separate commit touching lib/fonts.

 - Convert sbus drives to use remove callbacks returning void

 - Fix return values of __setup handlers

 - Section mismatch fix for grpci pci drivers

 - Make the vio bus type constant

 - Kconfig cleanups and fixes

 - Typo fixes

* tag 'sparc-for-6.9-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/alarsson/linux-sparc:
  lib/fonts: Allow Sparc console 8x16 font for sparc64 early boot text console
  sbus: uctrl: Convert to platform remove callback returning void
  sbus: flash: Convert to platform remove callback returning void
  sbus: envctrl: Convert to platform remove callback returning void
  sbus: display7seg: Convert to platform remove callback returning void
  sbus: bbc_i2c: Convert to platform remove callback returning void
  sbus: Add prototype for bbc_envctrl_init and bbc_envctrl_cleanup to header
  sparc32: Fix section mismatch in leon_pci_grpci
  sparc32: Fix parport build with sparc32
  sparc32: Do not select GENERIC_ISA_DMA
  mtd: maps: sun_uflash: Declare uflash_devinit static
  sparc32: Fix build with trapbase
  sparc32: Use generic cmpdi2/ucmpdi2 variants
  sparc: select FRAME_POINTER instead of redefining it
  sparc: vDSO: fix return value of __setup handler
  sparc64: NMI watchdog: fix return value of __setup handler
  sparc: vio: make vio_bus_type const
  sparc: Fix typos
  sparc: Use shared font data
  sparc: remove obsolete config ARCH_ATU

Merge tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2024-03-15T00:43:30+00:00

Pull MM updates from Andrew Morton:

- Sumanth Korikkar has taught s390 to allocate hotplug-time page frames
from hotplugged memory rather than only from main memory. Series
"implement "memmap on memory" feature on s390".

- More folio conversions from Matthew Wilcox in the series

"Convert memcontrol charge moving to use folios"
"mm: convert mm counter to take a folio"

- Chengming Zhou has optimized zswap's rbtree locking, providing
significant reductions in system time and modest but measurable
reductions in overall runtimes. The series is "mm/zswap: optimize the
scalability of zswap rb-tree".

- Chengming Zhou has also provided the series "mm/zswap: optimize zswap
lru list" which provides measurable runtime benefits in some
swap-intensive situations.

- And Chengming Zhou further optimizes zswap in the series "mm/zswap:
optimize for dynamic zswap_pools". Measured improvements are modest.

- zswap cleanups and simplifications from Yosry Ahmed in the series
"mm: zswap: simplify zswap_swapoff()".

- In the series "Add DAX ABI for memmap_on_memory", Vishal Verma has
contributed several DAX cleanups as well as adding a sysfs tunable to
control the memmap_on_memory setting when the dax device is
hotplugged as system memory.

- Johannes Weiner has added the large series "mm: zswap: cleanups",
which does that.

- More DAMON work from SeongJae Park in the series

"mm/damon: make DAMON debugfs interface deprecation unignorable"
"selftests/damon: add more tests for core functionalities and corner cases"
"Docs/mm/damon: misc readability improvements"
"mm/damon: let DAMOS feeds and tame/auto-tune itself"

- In the series "mm/mempolicy: weighted interleave mempolicy and sysfs
extension" Rakie Kim has developed a new mempolicy interleaving
policy wherein we allocate memory across nodes in a weighted fashion
rather than uniformly. This is beneficial in heterogeneous memory
environments appearing with CXL.

- Christophe Leroy has contributed some cleanup and consolidation work
against the ARM pagetable dumping code in the series "mm: ptdump:
Refactor CONFIG_DEBUG_WX and check_wx_pages debugfs attribute".

- Luis Chamberlain has added some additional xarray selftesting in the
series "test_xarray: advanced API multi-index tests".

- Muhammad Usama Anjum has reworked the selftest code to make its
human-readable output conform to the TAP ("Test Anything Protocol")
format. Amongst other things, this opens up the use of third-party
tools to parse and process out selftesting results.

- Ryan Roberts has added fork()-time PTE batching of THP ptes in the
series "mm/memory: optimize fork() with PTE-mapped THP". Mainly
targeted at arm64, this significantly speeds up fork() when the
process has a large number of pte-mapped folios.

- David Hildenbrand also gets in on the THP pte batching game in his
series "mm/memory: optimize unmap/zap with PTE-mapped THP". It
implements batching during munmap() and other pte teardown
situations. The microbenchmark improvements are nice.

- And in the series "Transparent Contiguous PTEs for User Mappings"
Ryan Roberts further utilizes arm's pte's contiguous bit ("contpte
mappings"). Kernel build times on arm64 improved nicely. Ryan's
series "Address some contpte nits" provides some followup work.

- In the series "mm/hugetlb: Restore the reservation" Breno Leitao has
fixed an obscure hugetlb race which was causing unnecessary page
faults. He has also added a reproducer under the selftest code.

- In the series "selftests/mm: Output cleanups for the compaction
test", Mark Brown did what the title claims.

- Kinsey Ho has added the series "mm/mglru: code cleanup and
refactoring".

- Even more zswap material from Nhat Pham. The series "fix and extend
zswap kselftests" does as claimed.

- In the series "Introduce cpu_dcache_is_aliasing() to fix DAX
regression" Mathieu Desnoyers has cleaned up and fixed rather a mess
in our handling of DAX on archiecctures which have virtually aliasing
data caches. The arm architecture is the main beneficiary.

- Lokesh Gidra's series "per-vma locks in userfaultfd" provides
dramatic improvements in worst-case mmap_lock hold times during
certain userfaultfd operations.

- Some page_owner enhancements and maintenance work from Oscar Salvador
in his series

"page_owner: print stacks and their outstanding allocations"
"page_owner: Fixup and cleanup"

- Uladzislau Rezki has contributed some vmalloc scalability
improvements in his series "Mitigate a vmap lock contention". It
realizes a 12x improvement for a certain microbenchmark.

- Some kexec/crash cleanup work from Baoquan He in the series "Split
crash out from kexec and clean up related config items".

- Some zsmalloc maintenance work from Chengming Zhou in the series

"mm/zsmalloc: fix and optimize objects/page migration"
"mm/zsmalloc: some cleanup for get/set_zspage_mapping()"

- Zi Yan has taught the MM to perform compaction on folios larger than
order=0. This a step along the path to implementaton of the merging
of large anonymous folios. The series is named "Enable >0 order folio
memory compaction".

- Christoph Hellwig has done quite a lot of cleanup work in the
pagecache writeback code in his series "convert write_cache_pages()
to an iterator".

- Some modest hugetlb cleanups and speedups in Vishal Moola's series
"Handle hugetlb faults under the VMA lock".

- Zi Yan has changed the page splitting code so we can split huge pages
into sizes other than order-0 to better utilize large folios. The
series is named "Split a folio to any lower order folios".

- David Hildenbrand has contributed the series "mm: remove
total_mapcount()", a cleanup.

- Matthew Wilcox has sought to improve the performance of bulk memory
freeing in his series "Rearrange batched folio freeing".

- Gang Li's series "hugetlb: parallelize hugetlb page init on boot"
provides large improvements in bootup times on large machines which
are configured to use large numbers of hugetlb pages.

- Matthew Wilcox's series "PageFlags cleanups" does that.

- Qi Zheng's series "minor fixes and supplement for ptdesc" does that
also. S390 is affected.

- Cleanups to our pagemap utility functions from Peter Xu in his series
"mm/treewide: Replace pXd_large() with pXd_leaf()".

- Nico Pache has fixed a few things with our hugepage selftests in his
series "selftests/mm: Improve Hugepage Test Handling in MM
Selftests".

- Also, of course, many singleton patches to many things. Please see
the individual changelogs for details.

* tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (435 commits)
mm/zswap: remove the memcpy if acomp is not sleepable
crypto: introduce: acomp_is_async to expose if comp drivers might sleep
memtest: use {READ,WRITE}_ONCE in memory scanning
mm: prohibit the last subpage from reusing the entire large folio
mm: recover pud_leaf() definitions in nopmd case
selftests/mm: skip the hugetlb-madvise tests on unmet hugepage requirements
selftests/mm: skip uffd hugetlb tests with insufficient hugepages
selftests/mm: dont fail testsuite due to a lack of hugepages
mm/huge_memory: skip invalid debugfs new_order input for folio split
mm/huge_memory: check new folio order when split a folio
mm, vmscan: retry kswapd's priority loop with cache_trim_mode off on failure
mm: add an explicit smp_wmb() to UFFDIO_CONTINUE
mm: fix list corruption in put_pages_list
mm: remove folio from deferred split list before uncharging it
filemap: avoid unnecessary major faults in filemap_fault()
mm,page_owner: drop unnecessary check
mm,page_owner: check for null stack_record before bumping its refcount
mm: swap: fix race between free_swap_and_cache() and swapoff()
mm/treewide: align up pXd_leaf() retval across archs
mm/treewide: drop pXd_large()
...

sparc32: Fix parport build with sparc32

2024-03-08T20:21:00+00:00

include/asm/parport.h is sparc64 specific.
Rename it to parport_64.h and use the generic version for sparc32.

This fixed all{mod,yes}config build errors like:

parport_pc.c:(.text):undefined-reference-to-ebus_dma_enable
parport_pc.c:(.text):undefined-reference-to-ebus_dma_irq_enable
parport_pc.c:(.text):undefined-reference-to-ebus_dma_register

The errors occur as the sparc32 build references sparc64 symbols.

Signed-off-by: Sam Ravnborg 
Cc: "David S. Miller" 
Cc: Andreas Larsson 
Cc: Randy Dunlap 
Cc: Maciej W. Rozycki 
Closes: https://lore.kernel.org/r/20230406160548.25721-1-rdunlap@infradead.org/
Fixes: 66bcd06099bb ("parport_pc: Also enable driver for PCI systems")
Cc: stable@vger.kernel.org # v5.18+
Tested-by: Randy Dunlap  # build-tested
Reviewed-by: Andreas Larsson 
Signed-off-by: Andreas Larsson 
Link: https://lore.kernel.org/r/20240224-sam-fix-sparc32-all-builds-v2-6-1f186603c5c4@ravnborg.org

mm/treewide: align up pXd_leaf() retval across archs

2024-03-06T21:04:19+00:00

Even if pXd_leaf() API is defined globally, it's not clear on the retval,
and there are three types used (bool, int, unsigned log).

Always return a boolean for pXd_leaf() APIs.

Link: https://lkml.kernel.org/r/20240305043750.93762-11-peterx@redhat.com
Signed-off-by: Peter Xu 
Suggested-by: Jason Gunthorpe 
Reviewed-by: Jason Gunthorpe 
Reviewed-by: Mike Rapoport (IBM) 
Cc: Alexander Potapenko 
Cc: Andrey Konovalov 
Cc: Andrey Ryabinin 
Cc: "Aneesh Kumar K.V" 
Cc: Borislav Petkov 
Cc: Christophe Leroy 
Cc: Dave Hansen 
Cc: Dmitry Vyukov 
Cc: Ingo Molnar 
Cc: Kirill A. Shutemov 
Cc: Michael Ellerman 
Cc: Muchun Song 
Cc: "Naveen N. Rao" 
Cc: Nicholas Piggin 
Cc: Thomas Gleixner 
Cc: Vincenzo Frascino 
Cc: Yang Shi 
Signed-off-by: Andrew Morton

mm/treewide: drop pXd_large()

2024-03-06T21:04:19+00:00

They're not used anymore, drop all of them.

Link: https://lkml.kernel.org/r/20240305043750.93762-10-peterx@redhat.com
Signed-off-by: Peter Xu 
Reviewed-by: Jason Gunthorpe 
Reviewed-by: Mike Rapoport (IBM) 
Cc: Alexander Potapenko 
Cc: Andrey Konovalov 
Cc: Andrey Ryabinin 
Cc: "Aneesh Kumar K.V" 
Cc: Borislav Petkov 
Cc: Christophe Leroy 
Cc: Dave Hansen 
Cc: Dmitry Vyukov 
Cc: Ingo Molnar 
Cc: Kirill A. Shutemov 
Cc: Michael Ellerman 
Cc: Muchun Song 
Cc: "Naveen N. Rao" 
Cc: Nicholas Piggin 
Cc: Thomas Gleixner 
Cc: Vincenzo Frascino 
Cc: Yang Shi 
Signed-off-by: Andrew Morton

arch: define CONFIG_PAGE_SIZE_*KB on all architectures

2024-03-06T18:29:09+00:00

Most architectures only support a single hardcoded page size. In order
to ensure that each one of these sets the corresponding Kconfig symbols,
change over the PAGE_SHIFT definition to the common one and allow
only the hardware page size to be selected.

Acked-by: Guo Ren 
Acked-by: Heiko Carstens 
Acked-by: Stafford Horne 
Acked-by: Johannes Berg 
Acked-by: Geert Uytterhoeven 
Reviewed-by: Thomas Gleixner 
Signed-off-by: Arnd Bergmann

Introduce cpu_dcache_is_aliasing() across all architectures

2024-02-22T23:27:19+00:00

Introduce a generic way to query whether the data cache is virtually
aliased on all architectures. Its purpose is to ensure that subsystems
which are incompatible with virtually aliased data caches (e.g. FS_DAX)
can reliably query this.

For data cache aliasing, there are three scenarios dependending on the
architecture. Here is a breakdown based on my understanding:

A) The data cache is always aliasing:

* arc
* csky
* m68k (note: shared memory mappings are incoherent ? SHMLBA is missing there.)
* sh
* parisc

B) The data cache aliasing is statically known or depends on querying CPU
   state at runtime:

* arm (cache_is_vivt() || cache_is_vipt_aliasing())
* mips (cpu_has_dc_aliases)
* nios2 (NIOS2_DCACHE_SIZE > PAGE_SIZE)
* sparc32 (vac_cache_size > PAGE_SIZE)
* sparc64 (L1DCACHE_SIZE > PAGE_SIZE)
* xtensa (DCACHE_WAY_SIZE > PAGE_SIZE)

C) The data cache is never aliasing:

* alpha
* arm64 (aarch64)
* hexagon
* loongarch (but with incoherent write buffers, which are disabled since
             commit d23b7795 ("LoongArch: Change SHMLBA from SZ_64K to PAGE_SIZE"))
* microblaze
* openrisc
* powerpc
* riscv
* s390
* um
* x86

Require architectures in A) and B) to select ARCH_HAS_CPU_CACHE_ALIASING and
implement "cpu_dcache_is_aliasing()".

Architectures in C) don't select ARCH_HAS_CPU_CACHE_ALIASING, and thus
cpu_dcache_is_aliasing() simply evaluates to "false".

Note that this leaves "cpu_icache_is_aliasing()" to be implemented as future
work. This would be useful to gate features like XIP on architectures
which have aliasing CPU dcache-icache but not CPU dcache-dcache.

Use "cpu_dcache" and "cpu_cache" rather than just "dcache" and "cache"
to clarify that we really mean "CPU data cache" and "CPU cache" to
eliminate any possible confusion with VFS "dentry cache" and "page
cache".

Link: https://lore.kernel.org/lkml/20030910210416.GA24258@mail.jlokier.co.uk/
Link: https://lkml.kernel.org/r/20240215144633.96437-9-mathieu.desnoyers@efficios.com
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches")
Signed-off-by: Mathieu Desnoyers 
Cc: Dan Williams 
Cc: Vishal Verma 
Cc: Dave Jiang 
Cc: Matthew Wilcox 
Cc: Arnd Bergmann 
Cc: Russell King 
Cc: Alasdair Kergon 
Cc: Christoph Hellwig 
Cc: Dave Chinner 
Cc: Heiko Carstens 
Cc: kernel test robot 
Cc: Michael Sclafani 
Cc: Mike Snitzer 
Cc: Mikulas Patocka 
Signed-off-by: Andrew Morton

sparc/pgtable: define PFN_PTE_SHIFT

2024-02-22T18:24:51+00:00

We want to make use of pte_next_pfn() outside of set_ptes().  Let's simply
define PFN_PTE_SHIFT, required by pte_next_pfn().

Link: https://lkml.kernel.org/r/20240129124649.189745-8-david@redhat.com
Signed-off-by: David Hildenbrand 
Tested-by: Ryan Roberts 
Reviewed-by: Mike Rapoport (IBM) 
Cc: Albert Ou 
Cc: Alexander Gordeev 
Cc: Alexandre Ghiti 
Cc: Aneesh Kumar K.V 
Cc: Catalin Marinas 
Cc: Christian Borntraeger 
Cc: Christophe Leroy 
Cc: David S. Miller 
Cc: Dinh Nguyen 
Cc: Gerald Schaefer 
Cc: Heiko Carstens 
Cc: Matthew Wilcox 
Cc: Michael Ellerman 
Cc: Naveen N. Rao 
Cc: Nicholas Piggin 
Cc: Palmer Dabbelt 
Cc: Paul Walmsley 
Cc: Russell King (Oracle) 
Cc: Sven Schnelle 
Cc: Vasily Gorbik 
Cc: Will Deacon 
Signed-off-by: Andrew Morton

sparc: Fix typos

2024-02-16T15:50:25+00:00

Fix typos, most reported by "codespell arch/sparc".  Only touches
comments, no code changes.

Signed-off-by: Bjorn Helgaas 
Cc: sparclinux@vger.kernel.org
Reviewed-by: Randy Dunlap 
Signed-off-by: Andreas Larsson 
Link: https://lore.kernel.org/r/20240103231605.1801364-9-helgaas@kernel.org

work around gcc bugs with 'asm goto' with outputs

2024-02-09T23:57:48+00:00

We've had issues with gcc and 'asm goto' before, and we created a
'asm_volatile_goto()' macro for that in the past: see commits
3f0116c3238a ("compiler/gcc4: Add quirk for 'asm goto' miscompilation
bug") and a9f180345f53 ("compiler/gcc4: Make quirk for
asm_volatile_goto() unconditional").

Then, much later, we ended up removing the workaround in commit
43c249ea0b1e ("compiler-gcc.h: remove ancient workaround for gcc PR
58670") because we no longer supported building the kernel with the
affected gcc versions, but we left the macro uses around.

Now, Sean Christopherson reports a new version of a very similar
problem, which is fixed by re-applying that ancient workaround.  But the
problem in question is limited to only the 'asm goto with outputs'
cases, so instead of re-introducing the old workaround as-is, let's
rename and limit the workaround to just that much less common case.

It looks like there are at least two separate issues that all hit in
this area:

 (a) some versions of gcc don't mark the asm goto as 'volatile' when it
     has outputs:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98619
        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110420

     which is easy to work around by just adding the 'volatile' by hand.

 (b) Internal compiler errors:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110422

     which are worked around by adding the extra empty 'asm' as a
     barrier, as in the original workaround.

but the problem Sean sees may be a third thing since it involves bad
code generation (not an ICE) even with the manually added 'volatile'.

but the same old workaround works for this case, even if this feels a
bit like voodoo programming and may only be hiding the issue.

Reported-and-tested-by: Sean Christopherson 
Link: https://lore.kernel.org/all/20240208220604.140859-1-seanjc@google.com/
Cc: Nick Desaulniers 
Cc: Uros Bizjak 
Cc: Jakub Jelinek 
Cc: Andrew Pinski 
Signed-off-by: Linus Torvalds