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-rw-r--r--include/asm-arm/thread_info.h2
-rw-r--r--include/asm-frv/thread_info.h2
-rw-r--r--include/asm-i386/thread_info.h2
-rw-r--r--include/asm-ia64/thread_info.h2
-rw-r--r--include/asm-powerpc/thread_info.h2
-rw-r--r--include/asm-sh/thread_info.h2
-rw-r--r--include/asm-x86_64/thread_info.h2
-rw-r--r--include/linux/freezer.h11
-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/power/process.c17
10 files changed, 30 insertions, 13 deletions
diff --git a/include/asm-arm/thread_info.h b/include/asm-arm/thread_info.h
index d9b8bddc8732..5014794f9eb3 100644
--- a/include/asm-arm/thread_info.h
+++ b/include/asm-arm/thread_info.h
@@ -147,6 +147,7 @@ extern void iwmmxt_task_switch(struct thread_info *);
#define TIF_POLLING_NRFLAG 16
#define TIF_USING_IWMMXT 17
#define TIF_MEMDIE 18
+#define TIF_FREEZE 19
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
@@ -154,6 +155,7 @@ extern void iwmmxt_task_switch(struct thread_info *);
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
+#define _TIF_FREEZE (1 << TIF_FREEZE)
/*
* Change these and you break ASM code in entry-common.S
diff --git a/include/asm-frv/thread_info.h b/include/asm-frv/thread_info.h
index d66c48e6ef14..d881f518e6a9 100644
--- a/include/asm-frv/thread_info.h
+++ b/include/asm-frv/thread_info.h
@@ -116,6 +116,7 @@ register struct thread_info *__current_thread_info asm("gr15");
#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE 17 /* OOM killer killed process */
+#define TIF_FREEZE 18 /* freezing for suspend */
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
@@ -125,6 +126,7 @@ register struct thread_info *__current_thread_info asm("gr15");
#define _TIF_IRET (1 << TIF_IRET)
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE (1 << TIF_FREEZE)
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h
index 46d32ad92082..4b187bb377b4 100644
--- a/include/asm-i386/thread_info.h
+++ b/include/asm-i386/thread_info.h
@@ -134,6 +134,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_MEMDIE 16
#define TIF_DEBUG 17 /* uses debug registers */
#define TIF_IO_BITMAP 18 /* uses I/O bitmap */
+#define TIF_FREEZE 19 /* is freezing for suspend */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
@@ -147,6 +148,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_DEBUG (1<<TIF_DEBUG)
#define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
+#define _TIF_FREEZE (1<<TIF_FREEZE)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK \
diff --git a/include/asm-ia64/thread_info.h b/include/asm-ia64/thread_info.h
index 8adcde0934ca..9b505b25544f 100644
--- a/include/asm-ia64/thread_info.h
+++ b/include/asm-ia64/thread_info.h
@@ -88,6 +88,7 @@ struct thread_info {
#define TIF_MEMDIE 17
#define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
#define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
+#define TIF_FREEZE 20 /* is freezing for suspend */
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
@@ -98,6 +99,7 @@ struct thread_info {
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
#define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
+#define _TIF_FREEZE (1 << TIF_FREEZE)
/* "work to do on user-return" bits */
#define TIF_ALLWORK_MASK (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h
index d339e2e88b11..3f32ca8bfec9 100644
--- a/include/asm-powerpc/thread_info.h
+++ b/include/asm-powerpc/thread_info.h
@@ -122,6 +122,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_RESTOREALL 12 /* Restore all regs (implies NOERROR) */
#define TIF_NOERROR 14 /* Force successful syscall return */
#define TIF_RESTORE_SIGMASK 15 /* Restore signal mask in do_signal */
+#define TIF_FREEZE 16 /* Freezing for suspend */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@@ -138,6 +139,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
#define _TIF_NOERROR (1<<TIF_NOERROR)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
+#define _TIF_FREEZE (1<<TIF_FREEZE)
#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
diff --git a/include/asm-sh/thread_info.h b/include/asm-sh/thread_info.h
index 0c01dc550819..879f741105db 100644
--- a/include/asm-sh/thread_info.h
+++ b/include/asm-sh/thread_info.h
@@ -106,6 +106,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE 18
+#define TIF_FREEZE 19
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
@@ -114,6 +115,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
#define _TIF_USEDFPU (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE (1<<TIF_FREEZE)
#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
diff --git a/include/asm-x86_64/thread_info.h b/include/asm-x86_64/thread_info.h
index 787a08114b48..74a6c74397f7 100644
--- a/include/asm-x86_64/thread_info.h
+++ b/include/asm-x86_64/thread_info.h
@@ -122,6 +122,7 @@ static inline struct thread_info *stack_thread_info(void)
#define TIF_MEMDIE 20
#define TIF_DEBUG 21 /* uses debug registers */
#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
+#define TIF_FREEZE 23 /* is freezing for suspend */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
@@ -137,6 +138,7 @@ static inline struct thread_info *stack_thread_info(void)
#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
#define _TIF_DEBUG (1<<TIF_DEBUG)
#define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
+#define _TIF_FREEZE (1<<TIF_FREEZE)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK \
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 393063096134..5e75e26d4787 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -16,16 +16,15 @@ static inline int frozen(struct task_struct *p)
*/
static inline int freezing(struct task_struct *p)
{
- return p->flags & PF_FREEZE;
+ return test_tsk_thread_flag(p, TIF_FREEZE);
}
/*
* Request that a process be frozen
- * FIXME: SMP problem. We may not modify other process' flags!
*/
static inline void freeze(struct task_struct *p)
{
- p->flags |= PF_FREEZE;
+ set_tsk_thread_flag(p, TIF_FREEZE);
}
/*
@@ -33,7 +32,7 @@ static inline void freeze(struct task_struct *p)
*/
static inline void do_not_freeze(struct task_struct *p)
{
- p->flags &= ~PF_FREEZE;
+ clear_tsk_thread_flag(p, TIF_FREEZE);
}
/*
@@ -54,7 +53,9 @@ static inline int thaw_process(struct task_struct *p)
*/
static inline void frozen_process(struct task_struct *p)
{
- p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN;
+ p->flags |= PF_FROZEN;
+ wmb();
+ clear_tsk_thread_flag(p, TIF_FREEZE);
}
extern void refrigerator(void);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ea92e5c89089..446373535190 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1144,7 +1144,6 @@ static inline void put_task_struct(struct task_struct *t)
#define PF_MEMALLOC 0x00000800 /* Allocating memory */
#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
-#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
#define PF_FROZEN 0x00010000 /* frozen for system suspend */
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
diff --git a/kernel/power/process.c b/kernel/power/process.c
index b9a32860bef3..6d566bf7085c 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -60,13 +60,16 @@ static inline void freeze_process(struct task_struct *p)
unsigned long flags;
if (!freezing(p)) {
- if (p->state == TASK_STOPPED)
- force_sig_specific(SIGSTOP, p);
-
- freeze(p);
- spin_lock_irqsave(&p->sighand->siglock, flags);
- signal_wake_up(p, p->state == TASK_STOPPED);
- spin_unlock_irqrestore(&p->sighand->siglock, flags);
+ rmb();
+ if (!frozen(p)) {
+ if (p->state == TASK_STOPPED)
+ force_sig_specific(SIGSTOP, p);
+
+ freeze(p);
+ spin_lock_irqsave(&p->sighand->siglock, flags);
+ signal_wake_up(p, p->state == TASK_STOPPED);
+ spin_unlock_irqrestore(&p->sighand->siglock, flags);
+ }
}
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.