Public bug reported:
[ Impact ]
lttng-modules does not compile from source in Questing with kernel 6.17:
src/../include/ringbuffer/frontend_api.h: In function ‘lib_ring_buffer_reserve’:
/usr/src/linux-headers-6.17.0-3-generic/include/linux/percpu-defs.h:220:45:
error: initialization from pointer to non-enclosed address space
220 | const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;
\
| ^
/usr/src/linux-headers-6.17.0-3-generic/include/linux/percpu-defs.h:238:9:
note: in expansion of macro ‘__verify_pcpu_ptr’
238 | __verify_pcpu_ptr(ptr);
\
| ^~~~~~~~~~~~~~~~~
src/../include/ringbuffer/frontend_api.h:155:23: note: in expansion of macro
‘per_cpu_ptr’
155 | buf = per_cpu_ptr(chan->backend.buf,
ctx->priv.reserve_cpu);
| ^~~~~~~~~~~
[ Fix ]
Patch the code to properly support Linux 6.17 by applying the following commits
from upstream:
- f86e2417 fix: percpu: repurpose __percpu tag as a named address space
qualifier (v6.15)
- 49403039 fix: mm: remove the for_reclaim field from struct writeback_control
(v6.17)
[ Test Plan ]
Build the dkms correctly on Questing:
$ sudo apt install -y lttng-modules-dkms
$ dkms status
lttng-modules/2.14.0, 6.17.0-3-generic, x86_64: installed
** Affects: lttng-modules (Ubuntu)
Importance: Undecided
Assignee: Massimiliano Pellizzer (mpellizzer)
Status: In Progress
** Affects: lttng-modules (Ubuntu Questing)
Importance: Undecided
Assignee: Massimiliano Pellizzer (mpellizzer)
Status: In Progress
** Also affects: lttng-modules (Ubuntu Questing)
Importance: Undecided
Assignee: Massimiliano Pellizzer (mpellizzer)
Status: In Progress
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https://bugs.launchpad.net/bugs/2122419
Title:
lttng-modules FTBFS in Questing with kernel 6.17
Status in lttng-modules package in Ubuntu:
In Progress
Status in lttng-modules source package in Questing:
In Progress
Bug description:
[ Impact ]
lttng-modules does not compile from source in Questing with kernel
6.17:
src/../include/ringbuffer/frontend_api.h: In function
‘lib_ring_buffer_reserve’:
/usr/src/linux-headers-6.17.0-3-generic/include/linux/percpu-defs.h:220:45:
error: initialization from pointer to non-enclosed address space
220 | const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;
\
| ^
/usr/src/linux-headers-6.17.0-3-generic/include/linux/percpu-defs.h:238:9:
note: in expansion of macro ‘__verify_pcpu_ptr’
238 | __verify_pcpu_ptr(ptr);
\
| ^~~~~~~~~~~~~~~~~
src/../include/ringbuffer/frontend_api.h:155:23: note: in expansion of macro
‘per_cpu_ptr’
155 | buf = per_cpu_ptr(chan->backend.buf,
ctx->priv.reserve_cpu);
| ^~~~~~~~~~~
[ Fix ]
Patch the code to properly support Linux 6.17 by applying the following
commits from upstream:
- f86e2417 fix: percpu: repurpose __percpu tag as a named address space
qualifier (v6.15)
- 49403039 fix: mm: remove the for_reclaim field from struct
writeback_control (v6.17)
[ Test Plan ]
Build the dkms correctly on Questing:
$ sudo apt install -y lttng-modules-dkms
$ dkms status
lttng-modules/2.14.0, 6.17.0-3-generic, x86_64: installed
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lttng-modules/+bug/2122419/+subscriptions
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