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| author | Eric W. Biederman <ebiederm@xmission.com> | 2022-04-12 10:18:48 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2022-05-07 09:01:59 -0500 |
| commit | 5bd2e97c868a8a44470950ed01846cab6328e540 (patch) | |
| tree | 7919866d9e44b6c98bfe16f6ac436013ce9e75c0 /kernel/fork.c | |
| parent | 36cb0e1cda645ee645b85a6ce652cb46a16e14e5 (diff) | |
| download | linux-stable-5bd2e97c868a8a44470950ed01846cab6328e540.tar.gz linux-stable-5bd2e97c868a8a44470950ed01846cab6328e540.tar.bz2 linux-stable-5bd2e97c868a8a44470950ed01846cab6328e540.zip | |
fork: Generalize PF_IO_WORKER handling
Add fn and fn_arg members into struct kernel_clone_args and test for
them in copy_thread (instead of testing for PF_KTHREAD | PF_IO_WORKER).
This allows any task that wants to be a user space task that only runs
in kernel mode to use this functionality.
The code on x86 is an exception and still retains a PF_KTHREAD test
because x86 unlikely everything else handles kthreads slightly
differently than user space tasks that start with a function.
The functions that created tasks that start with a function
have been updated to set ".fn" and ".fn_arg" instead of
".stack" and ".stack_size". These functions are fork_idle(),
create_io_thread(), kernel_thread(), and user_mode_thread().
Link: https://lkml.kernel.org/r/20220506141512.516114-4-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 93d77ee921ff..8e17c3fbce42 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2555,8 +2555,8 @@ struct task_struct * __init fork_idle(int cpu) struct task_struct *task; struct kernel_clone_args args = { .flags = CLONE_VM, - .stack = (unsigned long)&idle_dummy, - .stack_size = (unsigned long)NULL, + .fn = &idle_dummy, + .fn_arg = NULL, .kthread = 1, .idle = 1, }; @@ -2589,8 +2589,8 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node) .flags = ((lower_32_bits(flags) | CLONE_VM | CLONE_UNTRACED) & ~CSIGNAL), .exit_signal = (lower_32_bits(flags) & CSIGNAL), - .stack = (unsigned long)fn, - .stack_size = (unsigned long)arg, + .fn = fn, + .fn_arg = arg, .io_thread = 1, }; @@ -2694,8 +2694,8 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) .flags = ((lower_32_bits(flags) | CLONE_VM | CLONE_UNTRACED) & ~CSIGNAL), .exit_signal = (lower_32_bits(flags) & CSIGNAL), - .stack = (unsigned long)fn, - .stack_size = (unsigned long)arg, + .fn = fn, + .fn_arg = arg, .kthread = 1, }; @@ -2711,8 +2711,8 @@ pid_t user_mode_thread(int (*fn)(void *), void *arg, unsigned long flags) .flags = ((lower_32_bits(flags) | CLONE_VM | CLONE_UNTRACED) & ~CSIGNAL), .exit_signal = (lower_32_bits(flags) & CSIGNAL), - .stack = (unsigned long)fn, - .stack_size = (unsigned long)arg, + .fn = fn, + .fn_arg = arg, }; return kernel_clone(&args); |