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author | Rafael J. Wysocki <rjw@sisk.pl> | 2006-12-06 20:34:37 -0800 |
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committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:28 -0800 |
commit | a9b6f562f14dc28fb4b2415f0f275cede0abe9b5 (patch) | |
tree | 8d83009585877bf4c5f263690468d35105058822 /kernel | |
parent | a6d70980602e6f1869ebcdcbfaf55a0a5941583e (diff) | |
download | linux-stable-a9b6f562f14dc28fb4b2415f0f275cede0abe9b5.tar.gz linux-stable-a9b6f562f14dc28fb4b2415f0f275cede0abe9b5.tar.bz2 linux-stable-a9b6f562f14dc28fb4b2415f0f275cede0abe9b5.zip |
[PATCH] swsusp: Untangle thaw_processes
Move the loop from thaw_processes() to a separate function and call it
independently for kernel threads and user space processes so that the order
of thawing tasks is clearly visible.
Drop thaw_kernel_threads() which is never used.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@suspend2.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/power/process.c | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c index 1badb9a89ade..fd0ebb942f50 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -20,6 +20,8 @@ */ #define TIMEOUT (20 * HZ) +#define FREEZER_KERNEL_THREADS 0 +#define FREEZER_USER_SPACE 1 static inline int freezeable(struct task_struct * p) { @@ -79,6 +81,11 @@ static void cancel_freezing(struct task_struct *p) } } +static inline int is_user_space(struct task_struct *p) +{ + return p->mm && !(p->flags & PF_BORROWED_MM); +} + /* 0 = success, else # of processes that we failed to stop */ int freeze_processes(void) { @@ -103,10 +110,9 @@ int freeze_processes(void) cancel_freezing(p); continue; } - if (p->mm && !(p->flags & PF_BORROWED_MM)) { - /* The task is a user-space one. - * Freeze it unless there's a vfork completion - * pending + if (is_user_space(p)) { + /* Freeze the task unless there is a vfork + * completion pending */ if (!p->vfork_done) freeze_process(p); @@ -155,31 +161,30 @@ int freeze_processes(void) return 0; } -void thaw_some_processes(int all) +static void thaw_tasks(int thaw_user_space) { struct task_struct *g, *p; - int pass = 0; /* Pass 0 = Kernel space, 1 = Userspace */ - printk("Restarting tasks... "); read_lock(&tasklist_lock); - do { - do_each_thread(g, p) { - /* - * is_user = 0 if kernel thread or borrowed mm, - * 1 otherwise. - */ - int is_user = !!(p->mm && !(p->flags & PF_BORROWED_MM)); - if (!freezeable(p) || (is_user != pass)) - continue; - if (!thaw_process(p)) - printk(KERN_INFO - "Strange, %s not stopped\n", p->comm); - } while_each_thread(g, p); + do_each_thread(g, p) { + if (!freezeable(p)) + continue; - pass++; - } while (pass < 2 && all); + if (is_user_space(p) == !thaw_user_space) + continue; + if (!thaw_process(p)) + printk(KERN_WARNING " Strange, %s not stopped\n", + p->comm ); + } while_each_thread(g, p); read_unlock(&tasklist_lock); +} + +void thaw_processes(void) +{ + printk("Restarting tasks ... "); + thaw_tasks(FREEZER_KERNEL_THREADS); + thaw_tasks(FREEZER_USER_SPACE); schedule(); printk("done.\n"); } |