linux.git/arch/hexagon, branch v6.16

mm: pgtable: fix pte_swp_exclusive

2025-06-11T21:52:08+00:00

Make pte_swp_exclusive return bool instead of int.  This will better
reflect how pte_swp_exclusive is actually used in the code.

This fixes swap/swapoff problems on Alpha due pte_swp_exclusive not
returning correct values when _PAGE_SWP_EXCLUSIVE bit resides in upper
32-bits of PTE (like on alpha).

Suggested-by: Al Viro 
Signed-off-by: Magnus Lindholm 
Cc: Sam James 
Link: https://lore.kernel.org/lkml/20250218175735.19882-2-linmag7@gmail.com/
Link: https://lore.kernel.org/lkml/20250602041118.GA2675383@ZenIV/
[ Applied as the 'sed' script Al suggested   - Linus ]
Signed-off-by: Linus Torvalds

Merge tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2025-06-07T17:05:35+00:00

Pull Kbuild updates from Masahiro Yamada:

 - Add support for the EXPORT_SYMBOL_GPL_FOR_MODULES() macro, which
   exports a symbol only to specified modules

 - Improve ABI handling in gendwarfksyms

 - Forcibly link lib-y objects to vmlinux even if CONFIG_MODULES=n

 - Add checkers for redundant or missing  inclusion

 - Deprecate the extra-y syntax

 - Fix a genksyms bug when including enum constants from *.symref files

* tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (28 commits)
  genksyms: Fix enum consts from a reference affecting new values
  arch: use always-$(KBUILD_BUILTIN) for vmlinux.lds
  kbuild: set y instead of 1 to KBUILD_{BUILTIN,MODULES}
  efi/libstub: use 'targets' instead of extra-y in Makefile
  module: make __mod_device_table__* symbols static
  scripts/misc-check: check unnecessary #include  when W=1
  scripts/misc-check: check missing #include  when W=1
  scripts/misc-check: add double-quotes to satisfy shellcheck
  kbuild: move W=1 check for scripts/misc-check to top-level Makefile
  scripts/tags.sh: allow to use alternative ctags implementation
  kconfig: introduce menu type enum
  docs: symbol-namespaces: fix reST warning with literal block
  kbuild: link lib-y objects to vmlinux forcibly even when CONFIG_MODULES=n
  tinyconfig: enable CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  docs/core-api/symbol-namespaces: drop table of contents and section numbering
  modpost: check forbidden MODULE_IMPORT_NS("module:") at compile time
  kbuild: move kbuild syntax processing to scripts/Makefile.build
  Makefile: remove dependency on archscripts for header installation
  Documentation/kbuild: Add new gendwarfksyms kABI rules
  Documentation/kbuild: Drop section numbers
  ...

arch: use always-$(KBUILD_BUILTIN) for vmlinux.lds

2025-06-07T05:38:07+00:00

The extra-y syntax is deprecated. Instead, use always-$(KBUILD_BUILTIN),
which behaves equivalently.

Signed-off-by: Masahiro Yamada 
Acked-by: Johannes Berg 
Reviewed-by: Nicolas Schier

syscall.h: introduce syscall_set_nr()

2025-05-12T00:48:15+00:00

Similar to syscall_set_arguments() that complements
syscall_get_arguments(), introduce syscall_set_nr() that complements
syscall_get_nr().

syscall_set_nr() is going to be needed along with syscall_set_arguments()
on all HAVE_ARCH_TRACEHOOK architectures to implement
PTRACE_SET_SYSCALL_INFO API.

Link: https://lkml.kernel.org/r/20250303112020.GD24170@strace.io
Signed-off-by: Dmitry V. Levin 
Tested-by: Charlie Jenkins 
Reviewed-by: Charlie Jenkins 
Acked-by: Helge Deller  # parisc
Reviewed-by: Maciej W. Rozycki  # mips
Cc: Alexander Gordeev 
Cc: Alexey Gladkov (Intel) 
Cc: Andreas Larsson 
Cc: anton ivanov 
Cc: Arnd Bergmann 
Cc: Borislav Betkov 
Cc: Brian Cain 
Cc: Christian Borntraeger 
Cc: Christian Zankel 
Cc: Christophe Leroy 
Cc: Dave Hansen 
Cc: Davide Berardi 
Cc: David S. Miller 
Cc: Dinh Nguyen 
Cc: Eugene Syromiatnikov 
Cc: Eugene Syromyatnikov 
Cc: Geert Uytterhoeven 
Cc: Guo Ren 
Cc: Heiko Carstens 
Cc: "H. Peter Anvin" 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Johannes Berg 
Cc: John Paul Adrian Glaubitz 
Cc: Jonas Bonn 
Cc: Madhavan Srinivasan 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Mike Frysinger 
Cc: Naveen N Rao 
Cc: Nicholas Piggin 
Cc: Oleg Nesterov 
Cc: Renzo Davoi 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Russel King 
Cc: Shuah Khan 
Cc: Stafford Horne 
Cc: Stefan Kristiansson 
Cc: Sven Schnelle 
Cc: Thomas Gleinxer 
Cc: Vasily Gorbik 
Cc: Vineet Gupta 
Cc: WANG Xuerui 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Signed-off-by: Andrew Morton

syscall.h: add syscall_set_arguments()

2025-05-12T00:48:15+00:00

This function is going to be needed on all HAVE_ARCH_TRACEHOOK
architectures to implement PTRACE_SET_SYSCALL_INFO API.

This partially reverts commit 7962c2eddbfe ("arch: remove unused function
syscall_set_arguments()") by reusing some of old syscall_set_arguments()
implementations.

[nathan@kernel.org: fix compile time fortify checks]
  Link: https://lkml.kernel.org/r/20250408213131.GA2872426@ax162
Link: https://lkml.kernel.org/r/20250303112009.GC24170@strace.io
Signed-off-by: Dmitry V. Levin 
Signed-off-by: Nathan Chancellor 
Tested-by: Charlie Jenkins 
Reviewed-by: Charlie Jenkins 
Acked-by: Helge Deller  # parisc
Reviewed-by: Maciej W. Rozycki 	[mips]
Cc: Alexander Gordeev 
Cc: Alexey Gladkov (Intel) 
Cc: Andreas Larsson 
Cc: anton ivanov 
Cc: Arnd Bergmann 
Cc: Borislav Betkov 
Cc: Brian Cain 
Cc: Christian Borntraeger 
Cc: Christian Zankel 
Cc: Christophe Leroy 
Cc: Dave Hansen 
Cc: Davide Berardi 
Cc: David S. Miller 
Cc: Dinh Nguyen 
Cc: Eugene Syromiatnikov 
Cc: Eugene Syromyatnikov 
Cc: Geert Uytterhoeven 
Cc: Guo Ren 
Cc: Heiko Carstens 
Cc: "H. Peter Anvin" 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Johannes Berg 
Cc: John Paul Adrian Glaubitz 
Cc: Jonas Bonn 
Cc: Madhavan Srinivasan 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Mike Frysinger 
Cc: Naveen N Rao 
Cc: Nicholas Piggin 
Cc: Oleg Nesterov 
Cc: Renzo Davoi 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Russel King 
Cc: Shuah Khan 
Cc: Stafford Horne 
Cc: Stefan Kristiansson 
Cc: Sven Schnelle 
Cc: Thomas Gleinxer 
Cc: Vasily Gorbik 
Cc: Vineet Gupta 
Cc: WANG Xuerui 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Signed-off-by: Andrew Morton

hexagon: add syscall_set_return_value()

2025-05-12T00:48:14+00:00

Patch series "ptrace: introduce PTRACE_SET_SYSCALL_INFO API", v7.

PTRACE_SET_SYSCALL_INFO is a generic ptrace API that complements
PTRACE_GET_SYSCALL_INFO by letting the ptracer modify details of system
calls the tracee is blocked in.

This API allows ptracers to obtain and modify system call details in a
straightforward and architecture-agnostic way, providing a consistent way
of manipulating the system call number and arguments across architectures.

As in case of PTRACE_GET_SYSCALL_INFO, PTRACE_SET_SYSCALL_INFO also does
not aim to address numerous architecture-specific system call ABI
peculiarities, like differences in the number of system call arguments for
such system calls as pread64 and preadv.

The current implementation supports changing only those bits of system
call information that are used by strace system call tampering, namely,
syscall number, syscall arguments, and syscall return value.

Support of changing additional details returned by
PTRACE_GET_SYSCALL_INFO, such as instruction pointer and stack pointer,
could be added later if needed, by using struct ptrace_syscall_info.flags
to specify the additional details that should be set.  Currently, "flags"
and "reserved" fields of struct ptrace_syscall_info must be initialized
with zeroes; "arch", "instruction_pointer", and "stack_pointer" fields are
currently ignored.

PTRACE_SET_SYSCALL_INFO currently supports only PTRACE_SYSCALL_INFO_ENTRY,
PTRACE_SYSCALL_INFO_EXIT, and PTRACE_SYSCALL_INFO_SECCOMP operations. 
Other operations could be added later if needed.

Ideally, PTRACE_SET_SYSCALL_INFO should have been introduced along with
PTRACE_GET_SYSCALL_INFO, but it didn't happen.  The last straw that
convinced me to implement PTRACE_SET_SYSCALL_INFO was apparent failure to
provide an API of changing the first system call argument on riscv
architecture [1].

ptrace(2) man page:

long ptrace(enum __ptrace_request request, pid_t pid, void *addr, void *data);
...
PTRACE_SET_SYSCALL_INFO
       Modify information about the system call that caused the stop.
       The "data" argument is a pointer to struct ptrace_syscall_info
       that specifies the system call information to be set.
       The "addr" argument should be set to sizeof(struct ptrace_syscall_info)).


This patch (of 6):

hexagon is the only architecture that provides HAVE_ARCH_TRACEHOOK but
doesn't define syscall_set_return_value().  Since this function is going
to be needed on all HAVE_ARCH_TRACEHOOK architectures to implement
PTRACE_SET_SYSCALL_INFO API, add it on hexagon, too.

Link: https://lore.kernel.org/all/59505464-c84a-403d-972f-d4b2055eeaac@gmail.com/ [1]
Link: https://lkml.kernel.org/r/20250303111953.GB24170@strace.io
Signed-off-by: Dmitry V. Levin 
Cc: Alexander Gordeev 
Cc: Alexey Gladkov (Intel) 
Cc: Andreas Larsson 
Cc: anton ivanov 
Cc: Arnd Bergmann 
Cc: Borislav Betkov 
Cc: Brian Cain 
Cc: Charlie Jenkins 
Cc: Christian Borntraeger 
Cc: Christian Zankel 
Cc: Christophe Leroy 
Cc: Dave Hansen 
Cc: Davide Berardi 
Cc: David S. Miller 
Cc: Dinh Nguyen 
Cc: Eugene Syromyatnikov 
Cc: Geert Uytterhoeven 
Cc: Guo Ren 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: "H. Peter Anvin" 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Johannes Berg 
Cc: John Paul Adrian Glaubitz 
Cc: Jonas Bonn 
Cc: Maciej W. Rozycki 
Cc: Madhavan Srinivasan 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Mike Frysinger 
Cc: Naveen N Rao 
Cc: Nicholas Piggin 
Cc: Oleg Nesterov 
Cc: Renzo Davoi 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Russel King 
Cc: Shuah Khan 
Cc: Stafford Horne 
Cc: Stefan Kristiansson 
Cc: Sven Schnelle 
Cc: Thomas Gleinxer 
Cc: Vasily Gorbik 
Cc: Vineet Gupta 
Cc: WANG Xuerui 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Cc: Eugene Syromiatnikov 
Signed-off-by: Andrew Morton

mm: introduce a common definition of mk_pte()

2025-05-12T00:48:02+00:00

Most architectures simply call pfn_pte().  Centralise that as the normal
definition and remove the definition of mk_pte() from the architectures
which have either that exact definition or something similar.

Link: https://lkml.kernel.org/r/20250402181709.2386022-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) 
Acked-by: Geert Uytterhoeven  # m68k
Acked-by: David Hildenbrand 
Reviewed-by: Alexander Gordeev  # s390
Cc: Zi Yan 
Cc: Andreas Larsson 
Cc: Anton Ivanov 
Cc: Dave Hansen 
Cc: "David S. Miller" 
Cc: Johannes Berg 
Cc: Muchun Song 
Cc: Richard Weinberger 
Cc: 
Signed-off-by: Andrew Morton

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

2025-04-08T19:09:28+00:00

Pull CRC cleanups from Eric Biggers:
 "Finish cleaning up the CRC kconfig options by removing the remaining
  unnecessary prompts and an unnecessary 'default y', removing
  CONFIG_LIBCRC32C, and documenting all the CRC library options"

* tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
  lib/crc: remove CONFIG_LIBCRC32C
  lib/crc: document all the CRC library kconfig options
  lib/crc: remove unnecessary prompt for CONFIG_CRC_ITU_T
  lib/crc: remove unnecessary prompt for CONFIG_CRC_T10DIF
  lib/crc: remove unnecessary prompt for CONFIG_CRC16
  lib/crc: remove unnecessary prompt for CONFIG_CRC_CCITT
  lib/crc: remove unnecessary prompt for CONFIG_CRC32 and drop 'default y'

lib/crc: remove unnecessary prompt for CONFIG_CRC_T10DIF

2025-04-04T18:31:42+00:00

All modules that need CONFIG_CRC_T10DIF already select it, so there is no
need to bother users about the option.

Reviewed-by: Christoph Hellwig 
Reviewed-by: "Martin K. Petersen" 
Acked-by: Ard Biesheuvel 
Link: https://lore.kernel.org/r/20250401221600.24878-5-ebiggers@kernel.org
Signed-off-by: Eric Biggers

lib/crc: remove unnecessary prompt for CONFIG_CRC16

2025-04-04T18:31:42+00:00

All modules that need CONFIG_CRC16 already select it, so there is no
need to bother users about the option.

Reviewed-by: Christoph Hellwig 
Reviewed-by: "Martin K. Petersen" 
Acked-by: Ard Biesheuvel 
Link: https://lore.kernel.org/r/20250401221600.24878-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers