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config: fix dequeue_signal check for kernels <4.20

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Before 4.20, kernel_siginfo_t was just called siginfo_t. This was
causing the kthread_dequeue_signal_3arg_task check, which uses
kernel_siginfo_t, to fail on older kernels.

In d6b8c17f1, we started checking for the "new" three-arg
dequeue_signal() by testing for the "old" version. Because that test is
explicitly using kernel_siginfo_t, it would fail, leading to the build
trying to use the new three-arg version, which would then not compile.

This commit fixes that by avoiding checking for the old 3-arg
dequeue_signal entirely. Instead, we check for the new one, as well as
the 4-arg form, and we use the old form as a fallback. This way, we
never have to test for it explicitly, and once we're building
HAVE_SIGINFO will make sure we get the right kernel_siginfo_t for it, so
everything works out nice.

Original-patch-by: Finix <yancw@info2soft.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16666
This commit is contained in:
Rob Norris 2024-10-21 13:50:13 +11:00 committed by GitHub
parent b2f6de7b58
commit 21cba06bef
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 31 additions and 24 deletions
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49
config/kernel-kthread.m4
View File

@ -17,14 +17,21 @@ AC_DEFUN([ZFS_AC_KERNEL_KTHREAD_COMPLETE_AND_EXIT], [
AC_DEFUN([ZFS_AC_KERNEL_KTHREAD_DEQUEUE_SIGNAL], [
dnl #
dnl # 5.17 API: enum pid_type * as new 4th dequeue_signal() argument,
dnl # 5768d8906bc23d512b1a736c1e198aa833a6daa4 ("signal: Requeue signals in the appropriate queue")
dnl # prehistory:
dnl # int dequeue_signal(struct task_struct *task, sigset_t *mask,
dnl # siginfo_t *info)
dnl #
dnl # int dequeue_signal(struct task_struct *task, sigset_t *mask, kernel_siginfo_t *info);
dnl # int dequeue_signal(struct task_struct *task, sigset_t *mask, kernel_siginfo_t *info, enum pid_type *type);
dnl # 4.20: kernel_siginfo_t introduced, replaces siginfo_t
dnl # int dequeue_signal(struct task_struct *task, sigset_t *mask,
dnl kernel_siginfo_t *info)
dnl #
dnl # 6.12 API: first arg struct_task* removed
dnl # int dequeue_signal(sigset_t *mask, kernel_siginfo_t *info, enum pid_type *type);
dnl # 5.17: enum pid_type introduced as 4th arg
dnl # int dequeue_signal(struct task_struct *task, sigset_t *mask,
dnl # kernel_siginfo_t *info, enum pid_type *type)
dnl #
dnl # 6.12: first arg struct_task* removed
dnl # int dequeue_signal(sigset_t *mask, kernel_siginfo_t *info,
dnl # enum pid_type *type)
dnl #
AC_MSG_CHECKING([whether dequeue_signal() takes 4 arguments])
ZFS_LINUX_TEST_RESULT([kthread_dequeue_signal_4arg], [
@ -33,11 +40,11 @@ AC_DEFUN([ZFS_AC_KERNEL_KTHREAD_DEQUEUE_SIGNAL], [
[dequeue_signal() takes 4 arguments])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether dequeue_signal() a task argument])
ZFS_LINUX_TEST_RESULT([kthread_dequeue_signal_3arg_task], [
AC_MSG_CHECKING([whether 3-arg dequeue_signal() takes a type argument])
ZFS_LINUX_TEST_RESULT([kthread_dequeue_signal_3arg_type], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_DEQUEUE_SIGNAL_3ARG_TASK, 1,
[dequeue_signal() takes a task argument])
AC_DEFINE(HAVE_DEQUEUE_SIGNAL_3ARG_TYPE, 1,
[3-arg dequeue_signal() takes a type argument])
], [
AC_MSG_RESULT(no)
])
@ -56,17 +63,6 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_KTHREAD_COMPLETE_AND_EXIT], [
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_KTHREAD_DEQUEUE_SIGNAL], [
ZFS_LINUX_TEST_SRC([kthread_dequeue_signal_3arg_task], [
#include <linux/sched/signal.h>
], [
struct task_struct *task = NULL;
sigset_t *mask = NULL;
kernel_siginfo_t *info = NULL;
int error __attribute__ ((unused));
error = dequeue_signal(task, mask, info);
])
ZFS_LINUX_TEST_SRC([kthread_dequeue_signal_4arg], [
#include <linux/sched/signal.h>
], [
@ -78,6 +74,17 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_KTHREAD_DEQUEUE_SIGNAL], [
error = dequeue_signal(task, mask, info, type);
])
ZFS_LINUX_TEST_SRC([kthread_dequeue_signal_3arg_type], [
#include <linux/sched/signal.h>
], [
sigset_t *mask = NULL;
kernel_siginfo_t *info = NULL;
enum pid_type *type = NULL;
int error __attribute__ ((unused));
error = dequeue_signal(mask, info, type);
])
])
AC_DEFUN([ZFS_AC_KERNEL_KTHREAD], [

6
module/os/linux/spl/spl-thread.c
View File

@ -171,11 +171,11 @@ issig(void)
#if defined(HAVE_DEQUEUE_SIGNAL_4ARG)
enum pid_type __type;
if (dequeue_signal(current, &set, &__info, &__type) != 0) {
#elif defined(HAVE_DEQUEUE_SIGNAL_3ARG_TASK)
if (dequeue_signal(current, &set, &__info) != 0) {
#else
#elif defined(HAVE_DEQUEUE_SIGNAL_3ARG_TYPE)
enum pid_type __type;
if (dequeue_signal(&set, &__info, &__type) != 0) {
#else
if (dequeue_signal(current, &set, &__info) != 0) {
#endif
spin_unlock_irq(&current->sighand->siglock);
kernel_signal_stop();