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Date: Fri, 22 Jul 2011 17:24:30 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Oleg Nesterov <oleg@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] x86/signal changes for v3.1
Linus,
Please pull the latest x86-signal-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-signal-for-linus
Thanks,
Ingo
------------------>
Oleg Nesterov (4):
x86, signals: Convert the IA32_EMULATION code to use set_current_blocked()
x86, signals: Convert the X86_32 code to use set_current_blocked()
x86, do_signal: Simplify the TS_RESTORE_SIGMASK logic
x86: Kill handle_signal()->set_fs()
arch/x86/ia32/ia32_signal.c | 22 +++++++----------
arch/x86/kernel/signal.c | 56 +++++++++++++-----------------------------
2 files changed, 27 insertions(+), 51 deletions(-)
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 588a7aa..6557769 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -127,15 +127,17 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
{
- mask &= _BLOCKABLE;
- spin_lock_irq(¤t->sighand->siglock);
+ sigset_t blocked;
+
current->saved_sigmask = current->blocked;
- siginitset(¤t->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+
+ mask &= _BLOCKABLE;
+ siginitset(&blocked, mask);
+ set_current_blocked(&blocked);
current->state = TASK_INTERRUPTIBLE;
schedule();
+
set_restore_sigmask();
return -ERESTARTNOHAND;
}
@@ -279,10 +281,7 @@ asmlinkage long sys32_sigreturn(struct pt_regs *regs)
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+ set_current_blocked(&set);
if (ia32_restore_sigcontext(regs, &frame->sc, &ax))
goto badframe;
@@ -308,10 +307,7 @@ asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+ set_current_blocked(&set);
if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
goto badframe;
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 40a2493..54ddaeb2 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -485,17 +485,18 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
asmlinkage int
sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
- mask &= _BLOCKABLE;
- spin_lock_irq(¤t->sighand->siglock);
+ sigset_t blocked;
+
current->saved_sigmask = current->blocked;
- siginitset(¤t->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+
+ mask &= _BLOCKABLE;
+ siginitset(&blocked, mask);
+ set_current_blocked(&blocked);
current->state = TASK_INTERRUPTIBLE;
schedule();
- set_restore_sigmask();
+ set_restore_sigmask();
return -ERESTARTNOHAND;
}
@@ -572,10 +573,7 @@ unsigned long sys_sigreturn(struct pt_regs *regs)
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+ set_current_blocked(&set);
if (restore_sigcontext(regs, &frame->sc, &ax))
goto badframe;
@@ -653,11 +651,15 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
static int
setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+ struct pt_regs *regs)
{
int usig = signr_convert(sig);
+ sigset_t *set = ¤t->blocked;
int ret;
+ if (current_thread_info()->status & TS_RESTORE_SIGMASK)
+ set = ¤t->saved_sigmask;
+
/* Set up the stack frame */
if (is_ia32) {
if (ka->sa.sa_flags & SA_SIGINFO)
@@ -672,12 +674,13 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
return -EFAULT;
}
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
return ret;
}
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
- sigset_t *oldset, struct pt_regs *regs)
+ struct pt_regs *regs)
{
sigset_t blocked;
int ret;
@@ -712,20 +715,11 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
- ret = setup_rt_frame(sig, ka, info, oldset, regs);
+ ret = setup_rt_frame(sig, ka, info, regs);
if (ret)
return ret;
-#ifdef CONFIG_X86_64
- /*
- * This has nothing to do with segment registers,
- * despite the name. This magic affects uaccess.h
- * macros' behavior. Reset it to the normal setting.
- */
- set_fs(USER_DS);
-#endif
-
/*
* Clear the direction flag as per the ABI for function entry.
*/
@@ -767,7 +761,6 @@ static void do_signal(struct pt_regs *regs)
struct k_sigaction ka;
siginfo_t info;
int signr;
- sigset_t *oldset;
/*
* We want the common case to go fast, which is why we may in certain
@@ -779,23 +772,10 @@ static void do_signal(struct pt_regs *regs)
if (!user_mode(regs))
return;
- if (current_thread_info()->status & TS_RESTORE_SIGMASK)
- oldset = ¤t->saved_sigmask;
- else
- oldset = ¤t->blocked;
-
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
- if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
- /*
- * A signal was successfully delivered; the saved
- * sigmask will have been stored in the signal frame,
- * and will be restored by sigreturn, so we can simply
- * clear the TS_RESTORE_SIGMASK flag.
- */
- current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
- }
+ handle_signal(signr, &info, &ka, regs);
return;
}
@@ -823,7 +803,7 @@ static void do_signal(struct pt_regs *regs)
*/
if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
- sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
+ set_current_blocked(¤t->saved_sigmask);
}
}
--
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