linux.git/scripts/mod/modpost.c, branch v7.1-rc2

Merge tag 'modules-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux

2026-04-15T00:16:38+00:00

Pull module updates from Sami Tolvanen:
 "Kernel symbol flags:

   - Replace the separate *_gpl symbol sections (__ksymtab_gpl and
     __kcrctab_gpl) with a unified symbol table and a new __kflagstab
     section.

     This section stores symbol flags, such as the GPL-only flag, as an
     8-bit bitset for each exported symbol. This is a cleanup that
     simplifies symbol lookup in the module loader by avoiding table
     fragmentation and will allow a cleaner way to add more flags later
     if needed.

  Module signature UAPI:

   - Move struct module_signature to the UAPI headers to allow reuse by
     tools outside the kernel proper, such as kmod and
     scripts/sign-file.

     This also renames a few constants for clarity and drops unused
     signature types as preparation for hash-based module integrity
     checking work that's in progress.

  Sysfs:

   - Add a /sys/module//import_ns sysfs attribute to show the
     symbol namespaces imported by loaded modules.

     This makes it easier to verify driver API access at runtime on
     systems that care about such things (e.g. Android).

  Cleanups and fixes:

   - Force sh_addr to 0 for all sections in module.lds. This prevents
     non-zero section addresses when linking modules with 'ld.bfd -r',
     which confused elfutils.

   - Fix a memory leak of charp module parameters on module unload when
     the kernel is configured with CONFIG_SYSFS=n.

   - Override the -EEXIST error code returned by module_init() to
     userspace. This prevents confusion with the errno reserved by the
     module loader to indicate that a module is already loaded.

   - Simplify the warning message and drop the stack dump on positive
     returns from module_init().

   - Drop unnecessary extern keywords from function declarations and
     synchronize parse_args() arguments with their implementation"

* tag 'modules-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux: (23 commits)
  module: Simplify warning on positive returns from module_init()
  module: Override -EEXIST module return
  documentation: remove references to *_gpl sections
  module: remove *_gpl sections from vmlinux and modules
  module: deprecate usage of *_gpl sections in module loader
  module: use kflagstab instead of *_gpl sections
  module: populate kflagstab in modpost
  module: add kflagstab section to vmlinux and modules
  module: define ksym_flags enumeration to represent kernel symbol flags
  selftests/bpf: verify_pkcs7_sig: Use 'struct module_signature' from the UAPI headers
  sign-file: use 'struct module_signature' from the UAPI headers
  tools uapi headers: add linux/module_signature.h
  module: Move 'struct module_signature' to UAPI
  module: Give MODULE_SIG_STRING a more descriptive name
  module: Give 'enum pkey_id_type' a more specific name
  module: Drop unused signature types
  extract-cert: drop unused definition of PKEY_ID_PKCS7
  docs: symbol-namespaces: mention sysfs attribute
  module: expose imported namespaces via sysfs
  module: Remove extern keyword from param prototypes
  ...

module: use kflagstab instead of *_gpl sections

2026-03-31T23:42:52+00:00

Read kflagstab section for vmlinux and modules to determine whether
kernel symbols are GPL only.

This patch eliminates the need for fragmenting the ksymtab for infering
the value of GPL-only symbol flag, henceforth stop populating *_gpl
versions of the ksymtab and kcrctab in modpost.

Signed-off-by: Siddharth Nayyar 
Reviewed-by: Petr Pavlu 
Signed-off-by: Sami Tolvanen

module: populate kflagstab in modpost

2026-03-31T23:42:52+00:00

This patch adds the ability to create entries for kernel symbol flag
bitsets in kflagstab. Modpost populates only the GPL-only flag for now.

Signed-off-by: Siddharth Nayyar 
Reviewed-by: Petr Pavlu 
Signed-off-by: Sami Tolvanen

modpost: Declare extra_warn with unused attribute

2026-03-30T05:45:34+00:00

A recent strengthening of -Wunused-but-set-variable (enabled with -Wall)
in clang under a new subwarning, -Wunused-but-set-global, points out an
unused static global variable in scripts/mod/modpost.c:

  scripts/mod/modpost.c:59:13: error: variable 'extra_warn' set but not used [-Werror,-Wunused-but-set-global]
     59 | static bool extra_warn;
        |             ^

This variable has been unused since commit 6c6c1fc09de3 ("modpost:
require a MODULE_DESCRIPTION()") but that is expected, as there are
currently no extra warnings at W=1 right now. Declare the variable with
the unused attribute to make it clear to the compiler that this variable
may be unused.

Cc: stable@vger.kernel.org
Fixes: 6c6c1fc09de3 ("modpost: require a MODULE_DESCRIPTION()")
Link: https://patch.msgid.link/20260325-modpost-extra_warn-unused-but-set-global-v1-1-2e84003b7e81@kernel.org
Reviewed-by: Nicolas Schier 
Signed-off-by: Nathan Chancellor

modpost: Amend ppc64 save/restfpr symnames for -Os build

2026-02-03T22:25:23+00:00

Building a size optimized ppc64 kernel (-Os), gcc emits more FP
save/restore symbols, that the linker generates on demand into the
.sfpr section. Explicitly allow-list those in scripts/mod/modpost.c,
too. They are needed for the amdgpu in-kernel floating point support.

MODPOST Module.symvers
ERROR: modpost: "_restfpr_20" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_26" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_22" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savegpr1_27" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savegpr1_25" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_28" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savegpr1_29" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savefpr_20" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_savefpr_22" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
ERROR: modpost: "_restfpr_15" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
WARNING: modpost: suppressed 56 unresolved symbol warnings because there were too many)

Signed-off-by: René Rebe 
Link: https://patch.msgid.link/20251123.131330.407910684435629198.rene@exactco.de
Signed-off-by: Nathan Chancellor

modpost: drop '*_probe' from section check whitelist

2025-12-16T13:12:29+00:00

Several symbol patterns used to be whitelisted to allow drivers to refer
to functions annotated with __devinit and __devexit, which have since
been removed.

Commit e1dc1bfe5b27 ("modpost: remove more symbol patterns from the
section check whitelist") removed most of these patterns but left
'*_probe' after a reported warning in an irqchip driver.

Turns out that was indeed an incorrect reference which has now been
fixed by commit 9b685058ca93 ("irqchip/qcom-irq-combiner: Fix section
mismatch").

A recently added clocksource driver also relies on this suffix to
suppress another valid warning, and that is being fixed separately. [1]

Note that drivers with valid reasons for suppressing the warnings can
use the __ref macros.

Link: https://lore.kernel.org/lkml/20251017054943.7195-1-johan@kernel.org/ [1]
Signed-off-by: Johan Hovold 
Reviewed-by: Thomas Gleixner 
Reviewed-by: Nathan Chancellor 
Link: https://patch.msgid.link/20251020091613.22562-1-johan@kernel.org
Signed-off-by: Nathan Chancellor

modpost: Ignore unresolved section bounds symbols

2025-10-14T21:45:22+00:00

In preparation for klp-build livepatch module creation tooling,
suppress warnings for unresolved references to linker-generated
__start_* and __stop_* section bounds symbols.

These symbols are expected to be undefined when modpost runs, as they're
created later by the linker.

Cc: Masahiro Yamada 
Acked-by: Petr Mladek 
Tested-by: Joe Lawrence 
Signed-off-by: Josh Poimboeuf

modpost: Create modalias for builtin modules

2025-09-24T16:10:45+00:00

For some modules, modalias is generated using the modpost utility and
the section is added to the module file.

When a module is added inside vmlinux, modpost does not generate
modalias for such modules and the information is lost.

As a result kmod (which uses modules.builtin.modinfo in userspace)
cannot determine that modalias is handled by a builtin kernel module.

$ cat /sys/devices/pci0000:00/0000:00:14.0/modalias
pci:v00008086d0000A36Dsv00001043sd00008694bc0Csc03i30

$ modinfo xhci_pci
name:           xhci_pci
filename:       (builtin)
license:        GPL
file:           drivers/usb/host/xhci-pci
description:    xHCI PCI Host Controller Driver

Missing modalias "pci:v*d*sv*sd*bc0Csc03i30*" which will be generated by
modpost if the module is built separately.

To fix this it is necessary to generate the same modalias for vmlinux as
for the individual modules. Fortunately '.vmlinux.export.o' is already
generated from which '.modinfo' can be extracted in the same way as for
vmlinux.o.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Alexey Gladkov 
Tested-by: Stephen Rothwell 
Reviewed-by: Nicolas Schier 
Link: https://patch.msgid.link/28d4da3b0e3fc8474142746bcf469e03752c3208.1758182101.git.legion@kernel.org
Signed-off-by: Nathan Chancellor

modpost: check forbidden MODULE_IMPORT_NS("module:") at compile time

2025-05-25T09:15:51+00:00

Explicitly adding MODULE_IMPORT_NS("module:...") is not allowed.

Currently, this is only checked at run time. That is, when such a
module is loaded, an error message like the following is shown:

  foo: module tries to import module namespace: module:bar

Obviously, checking this at compile time improves usability.

In such a case, modpost will report the following error at compile time:

  ERROR: modpost: foo: explicitly importing namespace "module:bar" is not allowed.

Signed-off-by: Masahiro Yamada

module: Extend the module namespace parsing

2025-05-25T09:12:03+00:00

Instead of only accepting "module:${name}", extend it with a comma
separated list of module names and add tail glob support.

That is, something like: "module:foo-*,bar" is now possible.

Signed-off-by: Peter Zijlstra 
Reviewed-by: Petr Pavlu 
Signed-off-by: Masahiro Yamada