linux.git/arch/powerpc/boot, branch master

Merge tag 'powerpc-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2026-08-18T19:08:13+00:00

Pull powerpc updates from Madhavan Srinivasan:

 - Enable Rust for ppc64le

 - ppc4xx gpio driver updates

 - Add power12 base enablement support

 - Validate arch_compat against host compatibility mode

 - Simplify bootx_scan_dt_build_struct() in powermac platform

 - Implement get_direction() in cpm2

 - Use cpu_relax() in ps3_create_spu()

 - Add NULL guard for cause_ipi in smp_muxed_ipi_message_pass

 - Fixes to handle pseries watchdogs in kdump path

 - Fix missing r2 clobber in PCREL inline assembly

 - Set GPIO chip parent on ppc44x

 - KVM: Introduce KVM_CAP_PPC_COMPAT_CAPS and wire up ioctl

 - KVM: Use generic xfer to guest work function

 - Enable to run posix cpu timers in task context

 - Misc fixes and cleanups

Thanks to Aditya Gupta, Alice Ryhl, Amit Machhiwal, Andrew Morton,
Anushree Mathur, Athira Rajeev, Bartosz Golaszewski, Cédric Le Goater,
Christian König, Christophe Leroy (CS GROUP), Gary Guo, Gaurav Batra,
Gautam Menghani, Gou Hao, Hari Bathini, Harsh Prateek Bora, jiazhenyuan,
Jinjie Ruan, Link Mauve, Linus Walleij, Mahesh Kumar G Mahesh
Salgaonkar, Michael Walle, Michal Suchánek, Mukesh Kumar Chaurasiya
(IBM), Nicholas Piggin, Nikhil Kumar Singh, Praveen K Pandey, Ritesh
Harjani (IBM), Rosen Penev, Saket Kumar Bhaskar, Shrikanth Hegde,
Sourabh Jain, Thorsten Blum, Vaibhav Jain, Venkat Rao Bagalkote, Vishal
Chourasia, Wentao Guan, and Yanfei Xu.

* tag 'powerpc-7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (62 commits)
  powerpc/pseries/iommu: switch to Default DMA window during kdump
  powerpc/configs: enable CONFIG_RAS to fix EDAC support
  KVM: PPC: Document KVM_PPC_GET_COMPAT_CAPS ioctl
  KVM: PPC: Book3S HV: Add support for compat CPU capabilities for KVM on PowerNV
  KVM: PPC: Book3S HV: Implement compat CPU capability retrieval for KVM on PowerVM
  KVM: PPC: Introduce KVM_CAP_PPC_COMPAT_CAPS and wire up ioctl
  gpio: ppc44x: use dev_name() for chip label
  gpio: ppc44x: fix undefined behavior in GPIO_MASK2 macro
  gpio: ppc44x: drop PPC-specific IO helpers
  gpio: ppc44x: Convert GPIO to generic MMIO
  gpio: ppc44x: Use platform resource helper for GPIO MMIO
  gpio: ppc44x: Use module platform driver helper for GPIO
  gpio: ppc44x: update all 4xx to 44x
  gpio: move ppc4xx gpio driver from arch/powerpc to drivers/gpio
  KVM: PPC: Use min() in kvm_vm_ioctl_check_extension()
  KVM: PPC: booke: Use min() in watchdog_next_timeout()
  powerpc/perf: Add power12 Base Performance Monitoring support
  powerpc: Add Power12 architected mode
  powerpc: Add Power12 raw mode
  powerpc/pseries: Limit PVR list to 16 entries for CAS negotiation
  ...

powerpc/boot: Remove unused sprintf()

2026-07-31T11:37:20+00:00

There have been no sprintf() callers in the boot wrapper since commit
e275e023aa69 ("powerpc/44x: Warp patches for the new NDFC driver").

Remove the function definition and declaration.

Signed-off-by: Thorsten Blum 
Reviewed-by: Christophe Leroy (CS GROUP) 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260724172200.208722-2-thorsten.blum@linux.dev

powerpc/boot: drop redundant assignment in serial_edit_cmdline

2026-07-31T11:31:03+00:00

Drop the redundant buffer assignment in serial_edit_cmdline() since the
cp pointer is immediately overwritten.

Signed-off-by: Thorsten Blum 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260528082357.1397611-3-thorsten.blum@linux.dev

powerpc/boot: Fix treeboot-akebono CPU node lookup check

2026-07-28T04:53:31+00:00

fdt_node_offset_by_prop_value() returns a negative error code on
failure - fix the check accordingly.

Fixes: 2a2c74b2efcb ("IBM Akebono: Add the Akebono platform")
Signed-off-by: Thorsten Blum 
Reviewed-by: Ritesh Harjani (IBM) 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260702211554.56923-6-thorsten.blum@linux.dev

powerpc/boot: Fix treeboot-currituck CPU node lookup check

2026-07-28T04:53:31+00:00

fdt_node_offset_by_prop_value() returns a negative error code on
failure - fix the check accordingly.

Fixes: 228d55053397 ("powerpc/47x: Add support for the new IBM currituck platform")
Signed-off-by: Thorsten Blum 
Reviewed-by: Ritesh Harjani (IBM) 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260702211554.56923-5-thorsten.blum@linux.dev

powerpc/boot: Fix simpleboot CPU node lookup check

2026-07-28T04:53:31+00:00

fdt_node_offset_by_prop_value() returns a negative error code on
failure - fix the check accordingly.

Fixes: d2477b5cc8ca ("[POWERPC] bootwrapper: Add a firmware-independent simpleboot target.")
Signed-off-by: Thorsten Blum 
Reviewed-by: Ritesh Harjani (IBM) 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260702211554.56923-4-thorsten.blum@linux.dev

Merge tag 'strncpy-removal-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

2026-06-19T21:56:45+00:00

Pull strncpy removal from Kees Cook:

 - Remove the per-arch strncpy implementations in alpha, m68k, powerpc,
   x86, and xtensa

 - Remove strncpy API

   Over the last 6 years working on strncpy removal there were 362
   commits by 70 contributors. Folks with more than 1 commit were:

    211  Justin Stitt 
     22  Xu Panda 
     21  Kees Cook 
     17  Thorsten Blum 
     12  Arnd Bergmann 
      4  Pranav Tyagi 
      4  Lee Jones 
      2  Steven Rostedt 
      2  Sam Ravnborg 
      2  Marcelo Moreira 
      2  Krzysztof Kozlowski 
      2  Kalle Valo 
      2  Jaroslav Kysela 
      2  Daniel Thompson 
      2  Andrew Lunn 

* tag 'strncpy-removal-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  string: Remove strncpy() from the kernel
  xtensa: Remove arch-specific strncpy() implementation
  x86: Remove arch-specific strncpy() implementation
  powerpc: Remove arch-specific strncpy() implementation
  m68k: Remove arch-specific strncpy() implementation
  alpha: Remove arch-specific strncpy() implementation

powerpc: Remove arch-specific strncpy() implementation

2026-06-18T23:37:13+00:00

strncpy() has no remaining callers in the kernel[1]. Remove the
powerpc-specific assembly implementation from both the kernel
(arch/powerpc/lib/string.S) and the boot wrapper
(arch/powerpc/boot/string.S), along with the __HAVE_ARCH_STRNCPY
define and declaration, falling back to the generic version in
lib/string.c.

The boot wrapper's strncpy had no callers in arch/powerpc/boot/.

Link: https://github.com/KSPP/linux/issues/90 [1]
Signed-off-by: Kees Cook

powerpc/boot: Allow text relocations for pseries wrapper with binutils 2.46+

2026-06-15T10:54:07+00:00

Binutils 2.46 changed the default linker behavior from '-z notext' to
'-z text', which treats dynamic relocations in read-only segments as
errors rather than warnings. This causes the pseries boot wrapper build
to fail with:

  /usr/bin/ld.bfd: arch/powerpc/boot/wrapper.a(crt0.o): warning:
    relocation against `_platform_stack_top' in read-only section `.text'
  /usr/bin/ld.bfd: error: read-only segment has dynamic relocations

The pseries wrapper uses '-pie' to create position-independent code.
However, crt0.S contains a pointer to '_platform_stack_top' in the .text
section, which requires a dynamic relocation at runtime. This creates
DT_TEXTREL (text relocations), which were allowed by default in binutils
2.45 and earlier (via implicit '-z notext') but are now rejected by
binutils 2.46+.

Add '-z notext' linker flag to explicitly allow text relocations for
the pseries platform, similar to what is already done for the epapr
platform. This restores the previous behavior and allows the boot
wrapper to build successfully with binutils 2.46+.

Signed-off-by: Amit Machhiwal 
Tested-by: Anushree Mathur 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20260525161601.32097-1-amachhiw@linux.ibm.com

powerpc: Fix indentation and replace typedef with struct name

2026-06-02T05:54:33+00:00

Indent several struct members using tabs instead of spaces.

Replace the typedef alias AOUTHDR with an explicit struct name to
silence a checkpatch warning.

Signed-off-by: Thorsten Blum 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20250517125834.421088-2-thorsten.blum@linux.dev