linux.git/arch/arc/include/uapi, branch v6.12.80

arc: convert to generic syscall table

2024-07-10T12:23:38+00:00

The uapi/asm/unistd_32.h and asm/syscall_table_32.h headers can now be
generated from scripts/syscall.tbl, which makes this consistent with
the other architectures that have their own syscall.tbl.

arc has a couple of architecture specific system calls, which I add to the
generic table. This for some reason includes the deprecated sys_sysfs()
syscall that was presumably added by accident.

The time32, renameat, stat64 and rlimit entries in the syscall_abis_32
entry are for system calls that were part of the generic ABI when arch/arc
got added but are no longer enabled by default for new architectures.

Both the user visible side of asm/unistd.h and the internal syscall
table in the kernel should have the same effective contents after this.

Signed-off-by: Arnd Bergmann

clone3: drop __ARCH_WANT_SYS_CLONE3 macro

2024-07-10T12:23:38+00:00

When clone3() was introduced, it was not obvious how each architecture
deals with setting up the stack and keeping the register contents in
a fork()-like system call, so this was left for the architecture
maintainers to implement, with __ARCH_WANT_SYS_CLONE3 defined by those
that already implement it.

Five years later, we still have a few architectures left that are missing
clone3(), and the macro keeps getting in the way as it's fundamentally
different from all the other __ARCH_WANT_SYS_* macros that are meant
to provide backwards-compatibility with applications using older
syscalls that are no longer provided by default.

Address this by reversing the polarity of the macro, adding an
__ARCH_BROKEN_SYS_CLONE3 macro to all architectures that don't
already provide the syscall, and remove __ARCH_WANT_SYS_CLONE3
from all the other ones.

Acked-by: Geert Uytterhoeven 
Signed-off-by: Arnd Bergmann

ARC: Fix typos

2024-04-02T01:40:39+00:00

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

Signed-off-by: Bjorn Helgaas 
Signed-off-by: Vineet Gupta

arch: simplify architecture specific page size configuration

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

arc, arm64, parisc and powerpc all have their own Kconfig symbols
in place of the common CONFIG_PAGE_SIZE_4KB symbols. Change these
so the common symbols are the ones that are actually used, while
leaving the arhcitecture specific ones as the user visible
place for configuring it, to avoid breaking user configs.

Reviewed-by: Christophe Leroy  (powerpc32)
Acked-by: Catalin Marinas 
Acked-by: Helge Deller  # parisc
Reviewed-by: Thomas Gleixner 
Signed-off-by: Arnd Bergmann

ARC: bpf: define uapi for BPF_PROG_TYPE_PERF_EVENT program type

2022-04-26T16:35:28+00:00

Define appropriate uapi for the BPF_PROG_TYPE_PERF_EVENT program type
by exporting the user_regs_struct structure instead of the pt_regs
structure that is in-kernel only.

Signed-off-by: Sergey Matyukevich 
Signed-off-by: Vineet Gupta

ARCv2: save ABI registers across signal handling

2021-06-11T00:21:38+00:00

ARCv2 has some configuration dependent registers (r30, r58, r59) which
could be targetted by the compiler. To keep the ABI stable, these were
unconditionally part of the glibc ABI
(sysdeps/unix/sysv/linux/arc/sys/ucontext.h:mcontext_t) however we
missed populating them (by saving/restoring them across signal
handling).

This patch fixes the issue by
 - adding arcv2 ABI regs to kernel struct sigcontext
 - populating them during signal handling

Change to struct sigcontext might seem like a glibc ABI change (although
it primarily uses ucontext_t:mcontext_t) but the fact is
 - it has only been extended (existing fields are not touched)
 - the old sigcontext was ABI incomplete to begin with anyways

Fixes: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/53
Cc: 
Tested-by: kernel test robot 
Reported-by: Vladimir Isaev 
Signed-off-by: Vineet Gupta

ARC: mm: PAE: use 40-bit physical page mask

2021-05-10T19:38:59+00:00

32-bit PAGE_MASK can not be used as a mask for physical addresses
when PAE is enabled. PAGE_MASK_PHYS must be used for physical
addresses instead of PAGE_MASK.

Without this, init gets SIGSEGV if pte_modify was called:

| potentially unexpected fatal signal 11.
| Path: /bin/busybox
| CPU: 0 PID: 1 Comm: init Not tainted 5.12.0-rc5-00003-g1e43c377a79f-dirty
| Insn could not be fetched
|     @No matching VMA found
|  ECR: 0x00040000 EFA: 0x00000000 ERET: 0x00000000
| STAT: 0x80080082 [IE U     ]   BTA: 0x00000000
|  SP: 0x5f9ffe44  FP: 0x00000000 BLK: 0xaf3d4
| LPS: 0x000d093e LPE: 0x000d0950 LPC: 0x00000000
| r00: 0x00000002 r01: 0x5f9fff14 r02: 0x5f9fff20
| ...
| Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

Signed-off-by: Vladimir Isaev 
Reported-by: kernel test robot 
Cc: Vineet Gupta 
Cc: stable@vger.kernel.org
Signed-off-by: Vineet Gupta

ARC: wireup clone3 syscall

2020-01-16T00:08:12+00:00

Signed-off-by: Vineet Gupta

treewide: Add SPDX license identifier - Kbuild

2019-05-30T18:32:33+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

      GPL-2.0

Reported-by: Masahiro Yamada 
Signed-off-by: Greg Kroah-Hartman 
Reviewed-by: Kate Stewart 
Signed-off-by: Greg Kroah-Hartman

KVM: export and iif KVM is supported

2019-03-28T16:27:42+00:00

I do not see any consistency about headers_install of 
and .

According to my analysis of Linux 5.1-rc1, there are 3 groups:

 [1] Both  and  are exported

    alpha, arm, hexagon, mips, powerpc, s390, sparc, x86

 [2]  is exported, but  is not

    arc, arm64, c6x, h8300, ia64, m68k, microblaze, nios2, openrisc,
    parisc, sh, unicore32, xtensa

 [3] Neither  nor  is exported

    csky, nds32, riscv

This does not match to the actual KVM support. At least, [2] is
half-baked.

Nor do arch maintainers look like they care about this. For example,
commit 0add53713b1c ("microblaze: Add missing kvm_para.h to Kbuild")
exported  to user-space in order to fix an in-kernel
build error.

We have two ways to make this consistent:

 [A] export both  and  for all
     architectures, irrespective of the KVM support

 [B] Match the header export of  and 
     to the KVM support

My first attempt was [A] because the code looks cleaner, but Paolo
suggested [B].

So, this commit goes with [B].

For most architectures,  was moved to the kernel-space.
I changed include/uapi/linux/Kbuild so that it checks generated
asm/kvm_para.h as well as check-in ones.

After this commit, there will be two groups:

 [1] Both  and  are exported

    arm, arm64, mips, powerpc, s390, x86

 [2] Neither  nor  is exported

    alpha, arc, c6x, csky, h8300, hexagon, ia64, m68k, microblaze,
    nds32, nios2, openrisc, parisc, riscv, sh, sparc, unicore32, xtensa

Signed-off-by: Masahiro Yamada 
Acked-by: Cornelia Huck 
Signed-off-by: Paolo Bonzini