Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  [MIPS] Fix sigset_t endianess swapping issues in 32-bit compat code.
  [MIPS] Fix uniprocessor Sibyte builds.
  [MIPS] Make entry.S a little more readable.
  [MIPS] Remove stray instruction from __get_user_asm_ll32.
  [MIPS] 32-bit: Fix warning about cast for fetching pointer from userspace.
  [MIPS] DECstation: Fix irq handling
  [MIPS] signals: make common _BLOCKABLE macro
  [MIPS] signal: Move sigframe definition for native O32/N64 into signal.c
  [MIPS] signal: Move {restore,setup}_sigcontext prototypes to their user
  [MIPS] signal: Fix warnings in o32 compat code.
  [MIPS] IP27: Enable N32 support in defconfig.
  Revert "[MIPS] Fix warning in get_user when fetching pointer object from userspace."
  [MIPS] Don't claim we support dma_declare_coherent_memory - we don't.
  [MIPS] Unify dma-{coherent,noncoherent.ip27,ip32}
  [MIPS] Improve branch prediction in ll/sc atomic operations.

arch/mips/kernel/entry.S

@@ -21,24 +21,21 @@
 #endif
 
 #ifndef CONFIG_PREEMPT
-	.macro	preempt_stop
-	local_irq_disable
-	.endm
 #define resume_kernel	restore_all
+#else
+#define __ret_from_irq	ret_from_exception
 #endif
 
 	.text
 	.align	5
+#ifndef CONFIG_PREEMPT
+FEXPORT(ret_from_exception)
+	local_irq_disable			# preempt stop
+	b	__ret_from_irq
+#endif
 FEXPORT(ret_from_irq)
 	LONG_S	s0, TI_REGS($28)
-#ifdef CONFIG_PREEMPT
-FEXPORT(ret_from_exception)
-#else
-	b	_ret_from_irq
-FEXPORT(ret_from_exception)
-	preempt_stop
-#endif
-FEXPORT(_ret_from_irq)
+FEXPORT(__ret_from_irq)
 	LONG_L	t0, PT_STATUS(sp)		# returning to kernel mode?
 	andi	t0, t0, KU_USER
 	beqz	t0, resume_kernel

arch/mips/kernel/linux32.c

@@ -39,6 +39,7 @@
 #include <net/sock.h>
 #include <net/scm.h>
 
+#include <asm/compat-signal.h>
 #include <asm/ipc.h>
 #include <asm/sim.h>
 #include <asm/uaccess.h>
@@ -736,3 +737,49 @@ _sys32_clone(nabi_no_regargs struct pt_regs regs)
 	return do_fork(clone_flags, newsp, &regs, 0,
 	               parent_tidptr, child_tidptr);
 }
+
+/*
+ * Implement the event wait interface for the eventpoll file. It is the kernel
+ * part of the user space epoll_pwait(2).
+ */
+asmlinkage long compat_sys_epoll_pwait(int epfd,
+	struct epoll_event __user *events, int maxevents, int timeout,
+	const compat_sigset_t __user *sigmask, size_t sigsetsize)
+{
+	int error;
+	sigset_t ksigmask, sigsaved;
+
+	/*
+	 * If the caller wants a certain signal mask to be set during the wait,
+	 * we apply it here.
+	 */
+	if (sigmask) {
+		if (sigsetsize != sizeof(sigset_t))
+			return -EINVAL;
+		if (!access_ok(VERIFY_READ, sigmask, sizeof(ksigmask)))
+			return -EFAULT;
+		if (__copy_conv_sigset_from_user(&ksigmask, sigmask))
+			return -EFAULT;
+		sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
+		sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
+	}
+
+	error = sys_epoll_wait(epfd, events, maxevents, timeout);
+
+	/*
+	 * If we changed the signal mask, we need to restore the original one.
+	 * In case we've got a signal while waiting, we do not restore the
+	 * signal mask yet, and we allow do_signal() to deliver the signal on
+	 * the way back to userspace, before the signal mask is restored.
+	 */
+	if (sigmask) {
+		if (error == -EINTR) {
+			memcpy(&current->saved_sigmask, &sigsaved,
+				sizeof(sigsaved));
+			set_thread_flag(TIF_RESTORE_SIGMASK);
+		} else
+			sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+	}
+
+	return error;
+}

arch/mips/kernel/scall64-64.S

@@ -470,4 +470,4 @@ sys_call_table:
 	PTR	sys_get_robust_list
 	PTR	sys_kexec_load			/* 5270 */
 	PTR	sys_getcpu
-	PTR	sys_epoll_pwait
+	PTR	compat_sys_epoll_pwait

arch/mips/kernel/scall64-n32.S

@@ -396,4 +396,4 @@ EXPORT(sysn32_call_table)
 	PTR	compat_sys_get_robust_list
 	PTR	compat_sys_kexec_load
 	PTR	sys_getcpu
-	PTR	sys_epoll_pwait
+	PTR	compat_sys_epoll_pwait

arch/mips/kernel/signal-common.h

@@ -19,37 +19,7 @@
 #  define DEBUGP(fmt, args...)
 #endif
 
-/*
- * Horribly complicated - with the bloody RM9000 workarounds enabled
- * the signal trampolines is moving to the end of the structure so we can
- * increase the alignment without breaking software compatibility.
- */
-#if ICACHE_REFILLS_WORKAROUND_WAR == 0
-
-struct sigframe {
-	u32 sf_ass[4];		/* argument save space for o32 */
-	u32 sf_code[2];		/* signal trampoline */
-	struct sigcontext sf_sc;
-	sigset_t sf_mask;
-};
-
-#else  /* ICACHE_REFILLS_WORKAROUND_WAR */
-
-struct sigframe {
-	u32 sf_ass[4];			/* argument save space for o32 */
-	u32 sf_pad[2];
-	struct sigcontext sf_sc;	/* hw context */
-	sigset_t sf_mask;
-	u32 sf_code[8] ____cacheline_aligned;	/* signal trampoline */
-};
-
-#endif	/* !ICACHE_REFILLS_WORKAROUND_WAR */
-
-/*
- * handle hardware context
- */
-extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
-extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
 /*
  * Determine which stack to use..

arch/mips/kernel/signal.c

@@ -34,10 +34,20 @@
 
 #include "signal-common.h"
 
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
+/*
+ * Horribly complicated - with the bloody RM9000 workarounds enabled
+ * the signal trampolines is moving to the end of the structure so we can
+ * increase the alignment without breaking software compatibility.
+ */
 #if ICACHE_REFILLS_WORKAROUND_WAR == 0
 
+struct sigframe {
+	u32 sf_ass[4];		/* argument save space for o32 */
+	u32 sf_code[2];		/* signal trampoline */
+	struct sigcontext sf_sc;
+	sigset_t sf_mask;
+};
+
 struct rt_sigframe {
 	u32 rs_ass[4];		/* argument save space for o32 */
 	u32 rs_code[2];		/* signal trampoline */
@@ -47,6 +57,14 @@ struct rt_sigframe {
 
 #else
 
+struct sigframe {
+	u32 sf_ass[4];			/* argument save space for o32 */
+	u32 sf_pad[2];
+	struct sigcontext sf_sc;	/* hw context */
+	sigset_t sf_mask;
+	u32 sf_code[8] ____cacheline_aligned;	/* signal trampoline */
+};
+
 struct rt_sigframe {
 	u32 rs_ass[4];			/* argument save space for o32 */
 	u32 rs_pad[2];

arch/mips/kernel/signal32.c

@@ -8,6 +8,7 @@
  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  */
 #include <linux/cache.h>
+#include <linux/compat.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
@@ -24,6 +25,7 @@
 
 #include <asm/abi.h>
 #include <asm/asm.h>
+#include <asm/compat-signal.h>
 #include <linux/bitops.h>
 #include <asm/cacheflush.h>
 #include <asm/sim.h>
@@ -104,8 +106,6 @@ typedef struct compat_siginfo {
 #define __NR_O32_rt_sigreturn		4193
 #define __NR_O32_restart_syscall	4253
 
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
 /* 32-bit compatibility types */
 
 #define _NSIG_BPW32	32
@@ -139,8 +139,20 @@ struct ucontext32 {
 	sigset_t32          uc_sigmask;   /* mask last for extensibility */
 };
 
+/*
+ * Horribly complicated - with the bloody RM9000 workarounds enabled
+ * the signal trampolines is moving to the end of the structure so we can
+ * increase the alignment without breaking software compatibility.
+ */
 #if ICACHE_REFILLS_WORKAROUND_WAR == 0
 
+struct sigframe32 {
+	u32 sf_ass[4];		/* argument save space for o32 */
+	u32 sf_code[2];		/* signal trampoline */
+	struct sigcontext32 sf_sc;
+	sigset_t sf_mask;
+};
+
 struct rt_sigframe32 {
 	u32 rs_ass[4];			/* argument save space for o32 */
 	u32 rs_code[2];			/* signal trampoline */
@@ -150,6 +162,14 @@ struct rt_sigframe32 {
 
 #else  /* ICACHE_REFILLS_WORKAROUND_WAR */
 
+struct sigframe32 {
+	u32 sf_ass[4];			/* argument save space for o32 */
+	u32 sf_pad[2];
+	struct sigcontext32 sf_sc;	/* hw context */
+	sigset_t sf_mask;
+	u32 sf_code[8] ____cacheline_aligned;	/* signal trampoline */
+};
+
 struct rt_sigframe32 {
 	u32 rs_ass[4];			/* argument save space for o32 */
 	u32 rs_pad[2];
@@ -493,13 +513,13 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
 
 asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
 {
-	struct sigframe __user *frame;
+	struct sigframe32 __user *frame;
 	sigset_t blocked;
 
-	frame = (struct sigframe __user *) regs.regs[29];
+	frame = (struct sigframe32 __user *) regs.regs[29];
 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 		goto badframe;
-	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
+	if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
 		goto badframe;
 
 	sigdelsetmask(&blocked, ~_BLOCKABLE);
@@ -536,7 +556,7 @@ asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
 	frame = (struct rt_sigframe32 __user *) regs.regs[29];
 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 		goto badframe;
-	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
+	if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
@@ -581,7 +601,7 @@ badframe:
 int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
 	int signr, sigset_t *set)
 {
-	struct sigframe __user *frame;
+	struct sigframe32 __user *frame;
 	int err = 0;
 
 	frame = get_sigframe(ka, regs, sizeof(*frame));
@@ -591,7 +611,8 @@ int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
 	err |= install_sigtramp(frame->sf_code, __NR_O32_sigreturn);
 
 	err |= setup_sigcontext32(regs, &frame->sf_sc);
-	err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
+	err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
+
 	if (err)
 		goto give_sigsegv;
 
@@ -650,7 +671,7 @@ int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
 	err |= __put_user(current->sas_ss_size,
 	                  &frame->rs_uc.uc_stack.ss_size);
 	err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
-	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+	err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
 
 	if (err)
 		goto give_sigsegv;

arch/mips/kernel/signal_n32.c

@@ -31,6 +31,7 @@
 
 #include <asm/asm.h>
 #include <asm/cacheflush.h>
+#include <asm/compat-signal.h>
 #include <asm/sim.h>
 #include <asm/uaccess.h>
 #include <asm/ucontext.h>
@@ -47,7 +48,9 @@
 #define __NR_N32_rt_sigreturn		6211
 #define __NR_N32_restart_syscall	6214
 
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
+extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
+
 
 /* IRIX compatible stack_t  */
 typedef struct sigaltstack32 {
@@ -61,7 +64,7 @@ struct ucontextn32 {
 	s32                 uc_link;
 	stack32_t           uc_stack;
 	struct sigcontext   uc_mcontext;
-	sigset_t            uc_sigmask;   /* mask last for extensibility */
+	compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
 };
 
 #if ICACHE_REFILLS_WORKAROUND_WAR == 0
@@ -127,7 +130,7 @@ asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
 	frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
 	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 		goto badframe;
-	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
+	if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
 		goto badframe;
 
 	sigdelsetmask(&set, ~_BLOCKABLE);
@@ -193,7 +196,7 @@ int setup_rt_frame_n32(struct k_sigaction * ka,
 	err |= __put_user(current->sas_ss_size,
 	                  &frame->rs_uc.uc_stack.ss_size);
 	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
-	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+	err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
 
 	if (err)
 		goto give_sigsegv;