linux.git/arch/arm/kernel/setup.c, branch v6.6.131

ARM: 9308/1: move setup functions to header

2023-06-19T08:35:55+00:00

A couple of functions are declared in arch/arm/mm/mmu.c rather than in a header,
which causes W=1 build warnings:

arch/arm/mm/init.c:97:13: error: no previous prototype for 'setup_dma_zone' [-Werror=missing-prototypes]
arch/arm/mm/mmu.c:118:13: error: no previous prototype for 'init_default_cache_policy' [-Werror=missing-prototypes]
arch/arm/mm/mmu.c:1195:13: error: no previous prototype for 'adjust_lowmem_bounds' [-Werror=missing-prototypes]
arch/arm/mm/mmu.c:1761:13: error: no previous prototype for 'paging_init' [-Werror=missing-prototypes]
arch/arm/mm/mmu.c:1794:13: error: no previous prototype for 'early_mm_init' [-Werror=missing-prototypes]

Move the declaratsion to asm/setup.h so they can be seen by the compiler
while building the definition.

Reviewed-by: Linus Walleij 
Reviewed-by: Kees Cook 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Russell King (Oracle)

ARM: 9300/1: Replace all non-returning strlcpy with strscpy

2023-06-19T08:35:49+00:00

strlcpy() reads the entire source buffer first.  This read may exceed
the destination size limit.  This is both inefficient and can lead to
linear read overflows if a source string is not NUL-terminated [1].  In
an effort to remove strlcpy() completely [2], replace strlcpy() here
with strscpy().  No return values were used, so direct replacement is
safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

[ardb: submitting to the patch tracker on behalf of Azeem]

Signed-off-by: Azeem Shaikh 
Reviewed-by: Linus Walleij 
Reviewed-by: Kees Cook 
Signed-off-by: Ard Biesheuvel 
Signed-off-by: Russell King (Oracle)

ARM: 9298/1: Drop custom mdesc->handle_irq()

2023-06-19T08:35:48+00:00

ARM exclusively uses GENERIC_IRQ_MULTI_HANDLER, so at some point
set_handle_irq() needs to be called to handle system-wide
interrupts.

For all DT-enabled boards, this call happens down in the
drivers/irqchip subsystem, after locating the target irqchip
driver from the device tree.

We still have a few instances of the boardfiles with machine
descriptors passing a machine-specific .handle_irq() to the
ARM kernel core.

Get rid of this by letting the few remaining machines consistently
call set_handle_irq() from the end of the .init_irq() callback
instead and diet down one member from the machine descriptor.

Cc: Marc Zyngier 
Reviewed-by: Arnd Bergmann 
Acked-by: Mark Rutland 
Signed-off-by: Linus Walleij 
Signed-off-by: Russell King (Oracle)

Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

2022-12-13T23:22:14+00:00

Pull ARM updates from Russell King:

 - update unwinder to cope with module PLTs

 - enable UBSAN on ARM

 - improve kernel fault message

 - update UEFI runtime page tables dump

 - avoid clang's __aeabi_uldivmod generated in NWFPE code

 - disable FIQs on CPU shutdown paths

 - update XOR register usage

 - a number of build updates (using .arch, thread pointer, removal of
   lazy evaluation in Makefile)

 - conversion of stacktrace code to stackwalk

 - findbit assembly updates

 - hwcap feature updates for ARMv8 CPUs

 - instruction dump updates for big-endian platforms

 - support for function error injection

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (31 commits)
  ARM: 9279/1: support function error injection
  ARM: 9277/1: Make the dumped instructions are consistent with the disassembled ones
  ARM: 9276/1: Refactor dump_instr()
  ARM: 9275/1: Drop '-mthumb' from AFLAGS_ISA
  ARM: 9274/1: Add hwcap for Speculative Store Bypassing Safe
  ARM: 9273/1: Add hwcap for Speculation Barrier(SB)
  ARM: 9272/1: vfp: Add hwcap for FEAT_AA32I8MM
  ARM: 9271/1: vfp: Add hwcap for FEAT_AA32BF16
  ARM: 9270/1: vfp: Add hwcap for FEAT_FHM
  ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd
  ARM: 9268/1: vfp: Add hwcap FPHP and ASIMDHP for FEAT_FP16
  ARM: 9267/1: Define Armv8 registers in AArch32 state
  ARM: findbit: add unwinder information
  ARM: findbit: operate by words
  ARM: findbit: convert to macros
  ARM: findbit: provide more efficient ARMv7 implementation
  ARM: findbit: document ARMv5 bit offset calculation
  ARM: 9259/1: stacktrace: Convert stacktrace to generic ARCH_STACKWALK
  ARM: 9258/1: stacktrace: Make stack walk callback consistent with generic code
  ARM: 9265/1: pass -march= only to compiler
  ...

ARM: 9274/1: Add hwcap for Speculative Store Bypassing Safe

2022-11-28T11:57:35+00:00

Speculative Store Bypassing Safe(FEAT_SSBS) is a feature present in
AArch32 state for Armv8 and is represented by ID_PFR2_EL1.SSBS
identification register.

This feature denotes the presence of PSTATE.ssbs bit and hence adding a
hwcap will enable the userspace to check it before trying to set/unset
this PSTATE.

This commit adds the ID feature bit detection, and uses elf_hwcap2
accordingly.

Reviewed-by: Linus Walleij 
Signed-off-by: Amit Daniel Kachhap 
Signed-off-by: Russell King (Oracle)

ARM: 9273/1: Add hwcap for Speculation Barrier(SB)

2022-11-28T11:57:35+00:00

Speculation Barrier(FEAT_SB) is a feature present in AArch32 state for
Armv8 and is represented by ISAR6.SB identification register.

This feature denotes the presence of SB instruction and hence adding a
hwcap will enable the userspace to check it before trying to use this
instruction.

This commit adds the ID feature bit detection, and uses elf_hwcap2
accordingly.

Reviewed-by: Linus Walleij 
Signed-off-by: Amit Daniel Kachhap 
Signed-off-by: Russell King (Oracle)

ARM: 9272/1: vfp: Add hwcap for FEAT_AA32I8MM

2022-11-28T11:57:34+00:00

Int8 matrix multiplication (FEAT_AA32I8MM) is a feature present in AArch32 state for Armv8 and is represented by ISAR6.I8MM identification register.

This feature denotes the presence of VSMMLA, VSUDOT, VUMMLA, VUSMMLA and
VUSDOT instructions and hence adding a hwcap will enable the userspace
to check it before trying to use those instructions.

Reviewed-by: Linus Walleij 
Signed-off-by: Amit Daniel Kachhap 
Signed-off-by: Russell King (Oracle)

ARM: 9271/1: vfp: Add hwcap for FEAT_AA32BF16

2022-11-28T11:57:33+00:00

Advanced SIMD BFloat16 (FEAT_AA32BF16) is a feature present in AArch32
state for Armv8 and is represented by ISAR6.BF16 identification
register.

This feature denotes the presence of VCVT, VCVTB, VCVTT, VDOT, VFMAB,
VFMAT and VMMLA instructions and hence adding a hwcap will enable the
userspace to check it before trying to use those instructions.

Reviewed-by: Linus Walleij 
Signed-off-by: Amit Daniel Kachhap 
Signed-off-by: Russell King (Oracle)

ARM: 9270/1: vfp: Add hwcap for FEAT_FHM

2022-11-28T11:57:33+00:00

Floating-point half-precision multiplication (FHM) is a feature present
in AArch32 state for Armv8 and is represented by ISAR6.FHM identification register.

This feature denotes the presence of VFMAL and VMFSL instructions and
hence adding a hwcap will enable the userspace to check it before
trying to use those instructions.

Reviewed-by: Linus Walleij 
Signed-off-by: Amit Daniel Kachhap 
Signed-off-by: Russell King (Oracle)

ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd

2022-11-28T11:57:32+00:00

Advanced Dot product is a feature present in AArch32 state for Armv8 and
is represented by ISAR6 identification register.

This feature denotes the presence of UDOT and SDOT instructions and hence adding a hwcap will enable the userspace to check it before trying to use those instructions.

Reviewed-by: Linus Walleij 
Signed-off-by: Amit Daniel Kachhap 
Signed-off-by: Russell King (Oracle)