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e0cd6c28a3
In `config/kernel-timer.m4` refactor slightly to check more generally
for the new `timer_setup()` APIs, but also check the callback signature
because some kernels (notably 4.14) have the new `timer_setup()` API but
use the old callback signature. Also add a check for a `flags` member in
`struct timer_list`, which was added in 4.1-rc8.
Add compatibility shims to `include/spl/sys/timer.h` to allow using the
new timer APIs with the only two caveats being that the callback
argument type must be declared as `spl_timer_list_t` and an explicit
assignment is required to get the timer variable for the `timer_of()`
macro. So the callback would look like this:
```c
__cv_wakeup(spl_timer_list_t t)
{
struct timer_list *tmr = (struct timer_list *)t;
struct thing *parent = from_timer(parent, tmr,
parent_timer_field);
... /* do stuff with parent */
```
Make some minor changes to `spl-condvar.c` and `spl-taskq.c` to use the
new timer APIs instead of conditional code.
Reviewed-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rafael Kitover <rkitover@gmail.com>
Closes #8647
74 lines
1.8 KiB
Plaintext
74 lines
1.8 KiB
Plaintext
dnl # 4.14-rc3 API change
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dnl # https://lwn.net/Articles/735887/
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dnl #
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dnl # Check if timer_list.func get passed a timer_list or an unsigned long
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dnl # (older kernels). Also sanity check the from_timer() and timer_setup()
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dnl # macros are available as well, since they will be used in the same newer
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dnl # kernels that support the new timer_list.func signature.
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dnl #
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dnl # Also check for the existance of flags in struct timer_list, they were
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dnl # added in 4.1-rc8 via 0eeda71bc30d.
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AC_DEFUN([ZFS_AC_KERNEL_TIMER_SETUP], [
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AC_MSG_CHECKING([whether timer_setup() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Werror"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/timer.h>
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struct my_task_timer {
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struct timer_list timer;
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int data;
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};
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void task_expire(struct timer_list *tl)
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{
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struct my_task_timer *task_timer = from_timer(task_timer, tl, timer);
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task_timer->data = 42;
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}
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],[
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struct my_task_timer task_timer;
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timer_setup(&task_timer.timer, task_expire, 0);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KERNEL_TIMER_SETUP, 1,
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[timer_setup() is available])
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],[
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AC_MSG_RESULT(no)
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])
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AC_MSG_CHECKING([whether timer function expects timer_list])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/timer.h>
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void task_expire(struct timer_list *tl) {}
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],[
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struct timer_list tl;
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tl.function = task_expire;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KERNEL_TIMER_FUNCTION_TIMER_LIST, 1,
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[timer_list.function gets a timer_list])
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],[
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AC_MSG_RESULT(no)
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])
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AC_MSG_CHECKING([whether struct timer_list has flags])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/timer.h>
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],[
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struct timer_list tl;
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tl.flags = 2;
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_KERNEL_TIMER_LIST_FLAGS, 1,
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[struct timer_list has a flags member])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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