linux-stable.git/arch/mips/vdso, branch master

mips: Add build salt to the vDSO

2026-06-29T09:29:43+00:00

The vDSO needs to have a unique build id in a similar manner
to the kernel and modules. Use the build salt macro.

Signed-off-by: Bastian Blank 
Signed-off-by: Thomas Bogendoerfer

Merge tag 'mips_7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2026-06-19T14:46:16+00:00

Pull MIPS updates from Thomas Bogendoerfer:

 - use software nodes for GPIO code

 - cleanups and fixes

* tag 'mips_7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (41 commits)
  mips: select legacy gpiolib interfaces where used
  MIPS: lib: Remove '.hidden' for local symbols
  MIPS: VDSO: Avoid including .got in dynamic segment
  MIPS: smp: report dying CPU to RCU in stop_this_cpu()
  MIPS: kernel: proc: Delete unnecessary braces in show_cpuinfo()
  MIPS: kernel: proc: Use seq_putc() calls in show_cpuinfo()
  mips: sched: Fix CPUMASK_OFFSTACK memory corruption
  MIPS: mm: Fix out-of-bounds write in maar_res_walk()
  MIPS: ath79: reduce ARCH_DMA_MINALIGN
  mips: dts: ar9132: fix wdt node name
  mips: Remove remaining defconfig references to the pktcdvd driver
  MIPS: mm: remove comment referring to removed CONFIG_MIPS_CMP
  MIPS: alchemy: db1300: switch to static device properties
  MIPS: alchemy: gpr: switch to static device properties
  MIPS: alchemy: db1000: use nodes attached to GPIO chips in properties
  MIPS: alchemy: mtx1: attach software nodes to GPIO chips
  MIPS: alchemy: provide visible function prototypes to board files
  MIPS: alchemy: platform: add missing include
  MIPS: ip22-gio: do not export device release function
  MIPS: ip22-gio: switch to dynamic root device
  ...

MIPS: VDSO: Avoid including .got in dynamic segment

2026-06-15T10:21:16+00:00

After commit 2db1ec80dfd5 ("MIPS: VDSO: Fold MIPS_DISABLE_VDSO into
MIPS_GENERIC_GETTIMEOFDAY"), building ARCH=mips allnoconfig with LLVM=1
shows some warnings from llvm-readelf while checking the VDSO for
dynamic relocations:

  llvm-readelf: warning: 'arch/mips/vdso/vdso.so.dbg.raw': invalid PT_DYNAMIC size (0xa4)
  llvm-readelf: warning: 'arch/mips/vdso/vdso.so.dbg.raw': PT_DYNAMIC dynamic table is invalid: SHT_DYNAMIC will be used

The blamed commit alters the link order of objects into vdso.so.raw,
placing vgettimeofday.o after sigreturn.o. This ultimately results in
the .text section shrinking slightly in size, which in turn changes the
offset of the .dynamic section.

  -  [ 9] .text             PROGBITS        000002f0 0002f0 000930 00  AX  0   0 16
  -  [10] .dynamic          DYNAMIC         00000c20 000c20 000090 08   A  5   0  4
  +  [ 9] .text             PROGBITS        000002f0 0002f0 000924 00  AX  0   0 16
  +  [10] .dynamic          DYNAMIC         00000c14 000c14 000090 08   A  5   0  4

Changing the offset of the .dynamic section causes the dynamic segment
size to grow by the same amount, which triggers a warning in
llvm-readelf because PT_DYNAMIC's p_filesz (0xa4) is no longer a
multiple of its sh_entsize (8):

  -  DYNAMIC        0x000c20 0x00000c20 0x00000c20 0x00098 0x00098 R   0x10
  +  DYNAMIC        0x000c14 0x00000c14 0x00000c14 0x000a4 0x000a4 R   0x10

The size of the dynamic segment was already incorrect before the blamed
comment, as it should be 0x90 like the .dynamic section above (18
entries at 8 bytes per entry); it just so happens that 0x98 % 8 is 0,
whereas 0xa4 % 8 is 4, so there was no warning.

Looking at the section to segment mapping of the dynamic segment reveals
that it includes the .got section, as it is implicitly placed after
.dynamic by ld.lld's orphan section heuristics and inherits its segments
from the linker script.

  [ 9] .text             PROGBITS        000002f0 0002f0 000924 00  AX  0   0 16
  [10] .dynamic          DYNAMIC         00000c14 000c14 000090 08   A  5   0  4
  [11] .got              PROGBITS        00000cb0 000cb0 000008 00 WAp  0   0 16

  Section to Segment mapping:
   Segment Sections...
    00     .mips_abiflags
    01     .reginfo
    02     .mips_abiflags .reginfo .hash .dynsym .dynstr .gnu.version .gnu.version_d .note .text .dynamic .got
    03     .dynamic .got
    04     .note

Explicitly describe the .got section in the MIPS VDSO linker script
after .rodata, which switches back to the default text segment,
resulting in a dynamic segment that is the exact size of the .dynamic
section as expected with no other layout changes.

  -  DYNAMIC        0x000c14 0x00000c14 0x00000c14 0x000a4 0x000a4 R   0x10
  +  DYNAMIC        0x000c14 0x00000c14 0x00000c14 0x00090 0x00090 R   0x4

  -   03     .dynamic .got
  +   03     .dynamic

Closes: https://github.com/ClangBuiltLinux/linux/issues/2166
Fixes: 2db1ec80dfd5 ("MIPS: VDSO: Fold MIPS_DISABLE_VDSO into MIPS_GENERIC_GETTIMEOFDAY")
Signed-off-by: Nathan Chancellor 
Reviewed-by: Thomas Weißschuh 
Acked-by: Nick Desaulniers 
Signed-off-by: Thomas Bogendoerfer

MIPS: VDSO: Fold MIPS_CLOCK_VSYSCALL into MIPS_GENERIC_GETTIMEOFDAY

2026-06-09T15:02:10+00:00

This configuration option exists so "that we don't provide the symbol
when there's no possibility of there being a usable clocksource".
However it only covers __vdso_gettimeofday() and none of the other vDSO
functions which should be affected by the same circumstances.slightly slightly.

Remove MIPS_CLOCK_VSYSCALL and fold its usecase into
MIPS_GENERIC_GETTIMEOFDAY, which works correctly.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Cc: Thomas Bogendoerfer 
Cc: Daniel Lezcano 
Cc: Thomas Gleixner 
Cc: Andy Lutomirski 
Cc: Vincenzo Frascino 
Cc: Arnd Bergmann 
Cc: linux-mips@vger.kernel.org
Link: https://patch.msgid.link/20260521-vdso-mips-kconfig-v1-9-2f79dcd6c78f@linutronix.de

MIPS: VDSO: Fold MIPS_DISABLE_VDSO into MIPS_GENERIC_GETTIMEOFDAY

2026-06-09T15:02:10+00:00

The currently used MIPS_DISABLE_VDSO will disable only the userspace
bits of the time-related vDSO. The kernel part is still pointlessly
built and running.

Remove MIPS_DISABLE_VDSO and fold its usecase into
MIPS_GENERIC_GETTIMEOFDAY, which works correctly.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Cc: Thomas Bogendoerfer 
Cc: Daniel Lezcano 
Cc: Thomas Gleixner 
Cc: Andy Lutomirski 
Cc: Vincenzo Frascino 
Cc: Arnd Bergmann 
Cc: linux-mips@vger.kernel.org
Link: https://patch.msgid.link/20260521-vdso-mips-kconfig-v1-7-2f79dcd6c78f@linutronix.de

MIPS: vdso: Provide getres_time64() for 32-bit ABIs

2026-01-13T13:42:23+00:00

For consistency with __vdso_clock_gettime64() there should also be a
64-bit variant of clock_getres(). This will allow the extension of
CONFIG_COMPAT_32BIT_TIME to the vDSO and finally the removal of 32-bit
time types from the kernel and UAPI.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://patch.msgid.link/20251223-vdso-compat-time32-v1-9-97ea7a06a543@linutronix.de

mips: Add -std= flag specified in KBUILD_CFLAGS to vdso CFLAGS

2025-04-27T07:37:10+00:00

GCC 15 changed the default C standard dialect from gnu17 to gnu23,
which should not have impacted the kernel because it explicitly requests
the gnu11 standard in the main Makefile. However, mips/vdso code uses
its own CFLAGS without a '-std=' value, which break with this dialect
change because of the kernel's own definitions of bool, false, and true
conflicting with the C23 reserved keywords.

  include/linux/stddef.h:11:9: error: cannot use keyword 'false' as enumeration constant
     11 |         false   = 0,
        |         ^~~~~
  include/linux/stddef.h:11:9: note: 'false' is a keyword with '-std=c23' onwards
  include/linux/types.h:35:33: error: 'bool' cannot be defined via 'typedef'
     35 | typedef _Bool                   bool;
        |                                 ^~~~
  include/linux/types.h:35:33: note: 'bool' is a keyword with '-std=c23' onwards

Add -std as specified in KBUILD_CFLAGS to the decompressor and purgatory
CFLAGS to eliminate these errors and make the C standard version of these
areas match the rest of the kernel.

Signed-off-by: Khem Raj 
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Bogendoerfer

MIPS: vdso: Switch to generic storage implementation

2025-02-21T08:54:02+00:00

The generic storage implementation provides the same features as the
custom one. However it can be shared between architectures, making
maintenance easier.

Co-developed-by: Nam Cao 
Signed-off-by: Nam Cao 
Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-13-13a4669dfc8c@linutronix.de

vdso: Rename included Makefile

2025-02-21T08:54:01+00:00

As the Makefile is included into other Makefiles it can not be used to
define objects to be built from the current source directory.
However the generic datastore will introduce such a local source file.
Rename the included Makefile so it is clear how it is to be used and to
make room for a regular Makefile in lib/vdso/.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-4-13a4669dfc8c@linutronix.de

MIPS: vdso: Avoid name conflict around "vdso_data"

2024-11-02T11:37:33+00:00

The generic vdso/datapage.h declares a symbol named "vdso_data".
Avoid a conflict by renaming the identically named variable in genvdso.c.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-9-b64f0842d512@linutronix.de