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authorChristoph Lameter <christoph@lameter.com>2005-06-25 02:13:50 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 20:10:13 -0400
commit3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73 (patch)
treed1e7c1e2e8902072042aefc3a7976b271cf76021 /Documentation/power/swsusp.txt
parentb3e112bcc19abd8e9657dca34a87316786e096f3 (diff)
[PATCH] Cleanup patch for process freezing
1. Establish a simple API for process freezing defined in linux/include/sched.h: frozen(process) Check for frozen process freezing(process) Check if a process is being frozen freeze(process) Tell a process to freeze (go to refrigerator) thaw_process(process) Restart process frozen_process(process) Process is frozen now 2. Remove all references to PF_FREEZE and PF_FROZEN from all kernel sources except sched.h 3. Fix numerous locations where try_to_freeze is manually done by a driver 4. Remove the argument that is no longer necessary from two function calls. 5. Some whitespace cleanup 6. Clear potential race in refrigerator (provides an open window of PF_FREEZE cleared before setting PF_FROZEN, recalc_sigpending does not check PF_FROZEN). This patch does not address the problem of freeze_processes() violating the rule that a task may only modify its own flags by setting PF_FREEZE. This is not clean in an SMP environment. freeze(process) is therefore not SMP safe! Signed-off-by: Christoph Lameter <christoph@lameter.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/power/swsusp.txt')
-rw-r--r--Documentation/power/swsusp.txt3
1 files changed, 1 insertions, 2 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index c7c3459fde43..4e1627cc5b51 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -164,8 +164,7 @@ place where the thread is safe to be frozen (no kernel semaphores
164should be held at that point and it must be safe to sleep there), and 164should be held at that point and it must be safe to sleep there), and
165add: 165add:
166 166
167 if (current->flags & PF_FREEZE) 167 try_to_freeze();
168 refrigerator(PF_FREEZE);
169 168
170If the thread is needed for writing the image to storage, you should 169If the thread is needed for writing the image to storage, you should
171instead set the PF_NOFREEZE process flag when creating the thread. 170instead set the PF_NOFREEZE process flag when creating the thread.