[PATCH] convert that currently tests _NSIG directly to use valid_signal()

Convert most of the current code that uses _NSIG directly to instead use
valid_signal().  This avoids gcc -W warnings and off-by-one errors.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 14 insertions, 9 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 93851bcd9584..eb8da36e13df 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -27,6 +27,7 @@
 #include <linux/mempolicy.h>
 #include <linux/cpuset.h>
 #include <linux/syscalls.h>
+#include <linux/signal.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -277,7 +278,7 @@ void set_special_pids(pid_t session, pid_t pgrp)
  */
 int allow_signal(int sig)
 {
-	if (sig < 1 || sig > _NSIG)
+	if (!valid_signal(sig) || sig < 1)
 		return -EINVAL;
 
 	spin_lock_irq(&current->sighand->siglock);
@@ -298,7 +299,7 @@ EXPORT_SYMBOL(allow_signal);
 
 int disallow_signal(int sig)
 {
-	if (sig < 1 || sig > _NSIG)
+	if (!valid_signal(sig) || sig < 1)
 		return -EINVAL;
 
 	spin_lock_irq(&current->sighand->siglock);
diff --git a/kernel/futex.c b/kernel/futex.c
index 7b54a672d0ad..c7130f86106c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -39,6 +39,7 @@
 #include <linux/mount.h>
 #include <linux/pagemap.h>
 #include <linux/syscalls.h>
+#include <linux/signal.h>
 
 #define FUTEX_HASHBITS (CONFIG_BASE_SMALL ? 4 : 8)
 
@@ -654,7 +655,7 @@ static int futex_fd(unsigned long uaddr, int signal)
 	int ret, err;
 
 	ret = -EINVAL;
-	if (signal < 0 || signal > _NSIG)
+	if (!valid_signal(signal))
 		goto out;
 
 	ret = get_unused_fd();
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index f5cc1cec0fb4..8dcb8f6288bc 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -16,6 +16,7 @@
 #include <linux/smp_lock.h>
 #include <linux/ptrace.h>
 #include <linux/security.h>
+#include <linux/signal.h>
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -166,7 +167,7 @@ bad:
 
 int ptrace_detach(struct task_struct *child, unsigned int data)
 {
-	if ((unsigned long) data > _NSIG)
+	if (!valid_signal(data))
 		return	-EIO;
 
 	/* Architecture-specific hardware disable .. */
diff --git a/kernel/signal.c b/kernel/signal.c
index e6567d7f2b62..8f3debc77c5b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -23,6 +23,7 @@
 #include <linux/syscalls.h>
 #include <linux/ptrace.h>
 #include <linux/posix-timers.h>
+#include <linux/signal.h>
 #include <asm/param.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -646,7 +647,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
 				 struct task_struct *t)
 {
 	int error = -EINVAL;
-	if (sig < 0 || sig > _NSIG)
+	if (!valid_signal(sig))
 		return error;
 	error = -EPERM;
 	if ((!info || ((unsigned long)info != 1 &&
@@ -1245,7 +1246,7 @@ send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 	 * Make sure legacy kernel users don't send in bad values
 	 * (normal paths check this in check_kill_permission).
 	 */
-	if (sig < 0 || sig > _NSIG)
+	if (!valid_signal(sig))
 		return -EINVAL;
 
 	/*
@@ -1520,7 +1521,7 @@ void do_notify_parent(struct task_struct *tsk, int sig)
 		if (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN)
 			sig = 0;
 	}
-	if (sig > 0 && sig <= _NSIG)
+	if (valid_signal(sig) && sig > 0)
 		__group_send_sig_info(sig, &info, tsk->parent);
 	__wake_up_parent(tsk, tsk->parent);
 	spin_unlock_irqrestore(&psig->siglock, flags);
@@ -2364,7 +2365,7 @@ do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact)
 {
 	struct k_sigaction *k;
 
-	if (sig < 1 || sig > _NSIG || (act && sig_kernel_only(sig)))
+	if (!valid_signal(sig) || sig < 1 || (act && sig_kernel_only(sig)))
 		return -EINVAL;
 
 	k = &current->sighand->action[sig-1];
diff --git a/kernel/sys.c b/kernel/sys.c
index 7f43d6e62c7a..f64e97cabe25 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -25,6 +25,7 @@
 #include <linux/dcookies.h>
 #include <linux/suspend.h>
 #include <linux/tty.h>
+#include <linux/signal.h>
 
 #include <linux/compat.h>
 #include <linux/syscalls.h>
@@ -1637,7 +1638,7 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
 	switch (option) {
 		case PR_SET_PDEATHSIG:
 			sig = arg2;
-			if (sig < 0 || sig > _NSIG) {
+			if (!valid_signal(sig)) {
 				error = -EINVAL;
 				break;
 			}