linux-omap 2.6.29: add missing ppoll patch

1 files changed, 287 insertions, 0 deletions

diff --git a/recipes/linux/linux-omap-2.6.29/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch b/recipes/linux/linux-omap-2.6.29/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch
new file mode 100644
index 0000000000..7852f0afdb
--- /dev/null
+++ b/recipes/linux/linux-omap-2.6.29/0001-implement-TIF_RESTORE_SIGMASK-support-and-enable-the.patch
@@ -0,0 +1,287 @@
+From 8a7643b09856f4f661403dcedbe0455b3cbeeea9 Mon Sep 17 00:00:00 2001
+From: Steven Newbury <s_j_newbury@yahoo.co.uk>
+Date: Fri, 22 May 2009 14:25:40 +0200
+Subject: [PATCH] implement TIF_RESTORE_SIGMASK support and enable the related
+ syscalls:
+
+pselect6
+ppoll
+epoll_pwait
+
+Based on http://www.spinics.net/lists/arm-kernel/msg38114.html
+---
+ arch/arm/include/asm/thread_info.h |    2 +
+ arch/arm/include/asm/unistd.h      |    7 ++-
+ arch/arm/kernel/calls.S            |    6 +-
+ arch/arm/kernel/signal.c           |   90 +++++++++++++++---------------------
+ 4 files changed, 46 insertions(+), 59 deletions(-)
+
+diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
+index 4f88482..2cf0917 100644
+--- a/arch/arm/include/asm/thread_info.h
++++ b/arch/arm/include/asm/thread_info.h
+@@ -136,6 +136,7 @@ extern void vfp_sync_state(struct thread_info *thread);
+ #define TIF_SIGPENDING		0
+ #define TIF_NEED_RESCHED	1
+ #define TIF_SYSCALL_TRACE	8
++#define TIF_RESTORE_SIGMASK	9       /* restore signal mask in do_signal */
+ #define TIF_POLLING_NRFLAG	16
+ #define TIF_USING_IWMMXT	17
+ #define TIF_MEMDIE		18
+@@ -144,6 +145,7 @@ extern void vfp_sync_state(struct thread_info *thread);
+ #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
+ #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
+ #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
++#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+ #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
+ #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
+ #define _TIF_FREEZE		(1 << TIF_FREEZE)
+diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
+index 94cc58e..cd1eaa0 100644
+--- a/arch/arm/include/asm/unistd.h
++++ b/arch/arm/include/asm/unistd.h
+@@ -360,8 +360,8 @@
+ #define __NR_readlinkat			(__NR_SYSCALL_BASE+332)
+ #define __NR_fchmodat			(__NR_SYSCALL_BASE+333)
+ #define __NR_faccessat			(__NR_SYSCALL_BASE+334)
+-					/* 335 for pselect6 */
+-					/* 336 for ppoll */
++#define __NR_pselect6			(__NR_SYSCALL_BASE+335)
++#define __NR_ppoll			(__NR_SYSCALL_BASE+336)
+ #define __NR_unshare			(__NR_SYSCALL_BASE+337)
+ #define __NR_set_robust_list		(__NR_SYSCALL_BASE+338)
+ #define __NR_get_robust_list		(__NR_SYSCALL_BASE+339)
+@@ -372,7 +372,7 @@
+ #define __NR_vmsplice			(__NR_SYSCALL_BASE+343)
+ #define __NR_move_pages			(__NR_SYSCALL_BASE+344)
+ #define __NR_getcpu			(__NR_SYSCALL_BASE+345)
+-					/* 346 for epoll_pwait */
++#define __NR_epoll_pwait		(__NR_SYSCALL_BASE+346)
+ #define __NR_kexec_load			(__NR_SYSCALL_BASE+347)
+ #define __NR_utimensat			(__NR_SYSCALL_BASE+348)
+ #define __NR_signalfd			(__NR_SYSCALL_BASE+349)
+@@ -430,6 +430,7 @@
+ #define __ARCH_WANT_SYS_SIGPENDING
+ #define __ARCH_WANT_SYS_SIGPROCMASK
+ #define __ARCH_WANT_SYS_RT_SIGACTION
++#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+ 
+ #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
+ #define __ARCH_WANT_SYS_TIME
+diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
+index 1680e9e..534000d 100644
+--- a/arch/arm/kernel/calls.S
++++ b/arch/arm/kernel/calls.S
+@@ -344,8 +344,8 @@
+ 		CALL(sys_readlinkat)
+ 		CALL(sys_fchmodat)
+ 		CALL(sys_faccessat)
+-/* 335 */	CALL(sys_ni_syscall)		/* eventually pselect6 */
+-		CALL(sys_ni_syscall)		/* eventually ppoll */
++/* 335 */	CALL(sys_pselect6)
++		CALL(sys_ppoll)
+ 		CALL(sys_unshare)
+ 		CALL(sys_set_robust_list)
+ 		CALL(sys_get_robust_list)
+@@ -355,7 +355,7 @@
+ 		CALL(sys_vmsplice)
+ 		CALL(sys_move_pages)
+ /* 345 */	CALL(sys_getcpu)
+-		CALL(sys_ni_syscall)		/* eventually epoll_pwait */
++		CALL(sys_epoll_pwait)
+ 		CALL(sys_kexec_load)
+ 		CALL(sys_utimensat)
+ 		CALL(sys_signalfd)
+diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
+index 80b8b5c..7645048 100644
+--- a/arch/arm/kernel/signal.c
++++ b/arch/arm/kernel/signal.c
+@@ -47,57 +47,23 @@ const unsigned long sigreturn_codes[7] = {
+ 	MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
+ };
+ 
+-static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
++static void do_signal(struct pt_regs * regs, int syscall);
+ 
+ /*
+  * atomically swap in the new signal mask, and wait for a signal.
+  */
+-asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
++asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
+ {
+-	sigset_t saveset;
+-
+ 	mask &= _BLOCKABLE;
+ 	spin_lock_irq(&current->sighand->siglock);
+-	saveset = current->blocked;
++	current->saved_sigmask = current->blocked;
+ 	siginitset(&current->blocked, mask);
+ 	recalc_sigpending();
+ 	spin_unlock_irq(&current->sighand->siglock);
+-	regs->ARM_r0 = -EINTR;
+-
+-	while (1) {
+-		current->state = TASK_INTERRUPTIBLE;
+-		schedule();
+-		if (do_signal(&saveset, regs, 0))
+-			return regs->ARM_r0;
+-	}
+-}
+-
+-asmlinkage int
+-sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
+-{
+-	sigset_t saveset, newset;
+-
+-	/* XXX: Don't preclude handling different sized sigset_t's. */
+-	if (sigsetsize != sizeof(sigset_t))
+-		return -EINVAL;
+-
+-	if (copy_from_user(&newset, unewset, sizeof(newset)))
+-		return -EFAULT;
+-	sigdelsetmask(&newset, ~_BLOCKABLE);
+-
+-	spin_lock_irq(&current->sighand->siglock);
+-	saveset = current->blocked;
+-	current->blocked = newset;
+-	recalc_sigpending();
+-	spin_unlock_irq(&current->sighand->siglock);
+-	regs->ARM_r0 = -EINTR;
+-
+-	while (1) {
+-		current->state = TASK_INTERRUPTIBLE;
+-		schedule();
+-		if (do_signal(&saveset, regs, 0))
+-			return regs->ARM_r0;
+-	}
++	current->state = TASK_INTERRUPTIBLE;
++	schedule();
++	set_thread_flag(TIF_RESTORE_SIGMASK);
++	return -ERESTARTNOHAND;
+ }
+ 
+ asmlinkage int 
+@@ -290,7 +256,7 @@ asmlinkage int sys_sigreturn(struct pt_regs *regs)
+ 
+ badframe:
+ 	force_sig(SIGSEGV, current);
+-	return 0;
++	return -EFAULT;
+ }
+ 
+ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
+@@ -325,7 +291,7 @@ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
+ 
+ badframe:
+ 	force_sig(SIGSEGV, current);
+-	return 0;
++	return -EFAULT;
+ }
+ 
+ static int
+@@ -541,7 +507,7 @@ static inline void restart_syscall(struct pt_regs *regs)
+ /*
+  * OK, we're invoking a handler
+  */	
+-static void
++static int
+ handle_signal(unsigned long sig, struct k_sigaction *ka,
+ 	      siginfo_t *info, sigset_t *oldset,
+ 	      struct pt_regs * regs, int syscall)
+@@ -592,7 +558,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
+ 
+ 	if (ret != 0) {
+ 		force_sigsegv(sig, tsk);
+-		return;
++		return ret;
+ 	}
+ 
+ 	/*
+@@ -606,6 +572,7 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
+ 	recalc_sigpending();
+ 	spin_unlock_irq(&tsk->sighand->siglock);
+ 
++	return ret;
+ }
+ 
+ /*
+@@ -617,11 +584,12 @@ handle_signal(unsigned long sig, struct k_sigaction *ka,
+  * the kernel can handle, and then we build all the user-level signal handling
+  * stack-frames in one go after that.
+  */
+-static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
++static void do_signal(struct pt_regs *regs, int syscall)
+ {
+ 	struct k_sigaction ka;
+ 	siginfo_t info;
+ 	int signr;
++	sigset_t *oldset;
+ 
+ 	/*
+ 	 * We want the common case to go fast, which
+@@ -630,18 +598,29 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
+ 	 * if so.
+ 	 */
+ 	if (!user_mode(regs))
+-		return 0;
++		return;
+ 
+ 	if (try_to_freeze())
+ 		goto no_signal;
+ 
+ 	single_step_clear(current);
+ 
++	if (test_thread_flag(TIF_RESTORE_SIGMASK))
++		oldset = &current->saved_sigmask;
++	else
++		oldset = &current->blocked;
++
+ 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ 	if (signr > 0) {
+-		handle_signal(signr, &ka, &info, oldset, regs, syscall);
++		if (handle_signal(signr, &ka, &info, oldset, regs, syscall) == 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 TIF_RESTORE_SIGMASK flag */
++			clear_thread_flag(TIF_RESTORE_SIGMASK);
++		}
+ 		single_step_set(current);
+-		return 1;
++		return;
+ 	}
+ 
+  no_signal:
+@@ -665,7 +644,7 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
+ 				usp = (u32 __user *)regs->ARM_sp;
+ 
+ 				/*
+-				 * Either we supports OABI only, or we have
++				 * Either we support OABI only, or we have
+ 				 * EABI with the OABI compat layer enabled.
+ 				 * In the later case we don't know if user
+ 				 * space is EABI or not, and if not we must
+@@ -695,12 +674,17 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
+ 		}
+ 	}
+ 	single_step_set(current);
+-	return 0;
++        /* if there's no signal to deliver, we just put the saved sigmask
++           back. */
++		if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
++			clear_thread_flag(TIF_RESTORE_SIGMASK);
++			sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
++		}
+ }
+ 
+ asmlinkage void
+ do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
+ {
+-	if (thread_flags & _TIF_SIGPENDING)
+-		do_signal(&current->blocked, regs, syscall);
++	if (thread_flags & (_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK))
++		do_signal(regs, syscall);
+ }
+-- 
+1.6.2.4
+