[REGRESSION] stable-rc/linux-5.15.y: (build) mixing declarations and code is a C99 extension [-Werror,-Wdeclara...

[REGRESSION] stable-rc/linux-5.15.y: (build) mixing declarations and code is a C99 extension [-Werror,-Wdeclara...

[KernelCI bot]

New build issue found on stable-rc/linux-5.15.y:

---
 mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement] in arch/arm64/kvm/vgic/vgic-its.o (arch/arm64/kvm/vgic/vgic-its.c) [logspec:kbuild,kbuild.compiler.error]
---

Log excerpt:
=====================================================
/tmp/kci/linux/arch/arm64/kvm/vgic/vgic-its.c:716:2: error: mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement]
  716 |         guard(srcu)(&kvm->srcu);
      |         ^
/tmp/kci/linux/include/linux/cleanup.h:109:15: note: expanded from macro 'guard'
  109 |         CLASS(_name, __UNIQUE_ID(guard))
      |                      ^
/tmp/kci/linux/include/linux/compiler-clang.h:20:29: note: expanded from macro '__UNIQUE_ID'
   20 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
      |                             ^
/tmp/kci/linux/include/linux/compiler_types.h:60:22: note: expanded from macro '__PASTE'
   60 | #define __PASTE(a,b) ___PASTE(a,b)
      |                      ^
/tmp/kci/linux/include/linux/compiler_types.h:59:23: note: expanded from macro '___PASTE'
   59 | #define ___PASTE(a,b) a##b
      |                       ^
<scratch space>:133:1: note: expanded from here
  133 | __UNIQUE_ID_guard463
      | ^
1 error generated.

=====================================================

When fixing this issue, please attribute this report according to the
patch submission rules:

Reported-by: kernelci.org bot <bot@kernelci.org>

For complete logs and details about the environment used, see the issue
on the KernelCI dashboard:

- dashboard: https://d.kernelci.org/i/maestro:501da437b2af08f7b75636c19b2a7543fcc11ea8
- giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
- commit HEAD:  84542dc850e7585c7955126241840610f34ecb08

# Builds where the incident occurred:

## defconfig+allmodconfig on (arm64):
- compiler: clang-21
- config: None
- dashboard: https://d.kernelci.org/build/maestro:6a5f8d1075cb84fb216ed766

#kernelci issue maestro:501da437b2af08f7b75636c19b2a7543fcc11ea8

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Re: [REGRESSION] stable-rc/linux-5.15.y: (build) mixing declarations and code is a C99 extension [-Werror,-Wdeclara...

[Sasha Levin]

On Tue, Jul 21, 2026 at 10:59:04PM -0000, KernelCI bot wrote:
> New build issue found on stable-rc/linux-5.15.y:
>
> /tmp/kci/linux/arch/arm64/kvm/vgic/vgic-its.c:716:2: error: mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement]
>   716 |         guard(srcu)(&kvm->srcu);

The 5.15 backport of 3a0724998162 ("KVM: Move kvm_io_bus_get_dev()
locking responsibilities to callers") placed guard(srcu) after a
statement, which 5.15.y still rejects with
-Wdeclaration-after-statement.

Fixed by replacing the 5.15 backport with the 5.10 backport of the
same upstream commit, which uses explicit
srcu_read_lock()/srcu_read_unlock() instead of guard() - the affected
functions are identical between the two trees. The next -rc should
build cleanly.

Thanks for the report.

-- 
Thanks,
Sasha

[REGRESSION] stable-rc/linux-5.15.y: (build) mixing declarations and code is a C99 extension [-Werror,-Wdeclara...

[KernelCI bot]

New build issue found on stable-rc/linux-5.15.y:

---
 mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement] in security/apparmor/policy.o (security/apparmor/policy.c) [logspec:kbuild,kbuild.compiler.error]
---

Log excerpt:
=====================================================
security/apparmor/policy.c:1111:10: error: mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement]
 1111 |         ssize_t udata_sz = udata->size;
      |                 ^
  CC      kernel/tsacct.o
1 error generated.

=====================================================

When fixing this issue, please attribute this report according to the
patch submission rules:

Reported-by: kernelci.org bot <bot@kernelci.org>
Link: https://lore.kernel.org/all/178455234467.13416.9935390187344263712@kernelci.org/

For complete logs and details about the environment used, see the issue
on the KernelCI dashboard:

- dashboard: https://d.kernelci.org/i/maestro:418b90021496bfde5ca7a7b1397343e2894b899e
- giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
- commit HEAD:  76d302b34381c7f1ab7fe4d0882631c2fbbc030c

# Builds where the incident occurred:

## defconfig+allmodconfig+CONFIG_FRAME_WARN=2048 on (arm):
- compiler: clang-21
- config: None
- dashboard: https://d.kernelci.org/build/maestro:6a5e0c2a3427a5b0fb023362

## i386_defconfig+allmodconfig+CONFIG_FRAME_WARN=2048 on (i386):
- compiler: clang-21
- config: https://files.kernelci.org/kbuild-clang-21-i386-allmodconfig-6a5e0c8a3427a5b0fb023447/.config
- dashboard: https://d.kernelci.org/build/maestro:6a5e0c8a3427a5b0fb023447

#kernelci issue maestro:418b90021496bfde5ca7a7b1397343e2894b899e

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[REGRESSION] stable-rc/linux-5.15.y: (build) mixing declarations and code is a C99 extension [-Werror,-Wdeclara...

[KernelCI bot]

Hello,

New build issue found on stable-rc/linux-5.15.y:

---
 mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement] in drivers/gpu/drm/sun4i/sun4i_backend.o (drivers/gpu/drm/sun4i/sun4i_backend.c) [logspec:kbuild,kbuild.compiler.error]
---

- dashboard: https://d.kernelci.org/i/maestro:b88e04d5e82ea9d31baaa986d3bdde82d8cbe1c9
- giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
- commit HEAD:  7d04e65adb8f77e1495a808e731537e67ec04e8a


Please include the KernelCI tag when submitting a fix:

Reported-by: kernelci.org bot <bot@kernelci.org>


Log excerpt:
=====================================================
/tmp/kci/linux/drivers/gpu/drm/sun4i/sun4i_backend.c:513:29: error: mixing declarations and code is a C99 extension [-Werror,-Wdeclaration-after-statement]
  513 |                 struct sun4i_layer_state *layer_state =
      |                                           ^
1 error generated.

=====================================================


# Builds where the incident occurred:

## defconfig+allmodconfig on (arm64):
- compiler: clang-21
- config: None
- dashboard: https://d.kernelci.org/build/maestro:6a1ac110ee38c2a863f01d7e

## defconfig+allmodconfig+CONFIG_FRAME_WARN=2048 on (arm):
- compiler: clang-21
- config: None
- dashboard: https://d.kernelci.org/build/maestro:6a1ac10cee38c2a863f01d7b


#kernelci issue maestro:b88e04d5e82ea9d31baaa986d3bdde82d8cbe1c9

--
This is an experimental report format. Please send feedback in!
Talk to us at kernelci@lists.linux.dev

Made with love by the KernelCI team - https://kernelci.org

Re: [REGRESSION] stable-rc/linux-5.15.y: (build) mixing declarations and code is a C99 extension [-Werror,-Wdeclara...

[Sasha Levin]

> New build issue found on stable-rc/linux-5.15.y:
> mixing declarations and code is a C99 extension
> [-Werror,-Wdeclaration-after-statement] in
> drivers/gpu/drm/sun4i/sun4i_backend.c

Dropped the offending patch from the 5.15 and 5.10 queues. Thanks!

--
Thanks,
Sasha