[BK/GNU] misc merges

[Jeff Garzik <jgarzik@pobox.com>]

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Marcelo,

Two small, misc patches.  The first helps battle stack overflow 
situations, and the second backports an akpm patch which greatly helps 
in remote debugging.

Both patches have been backported from 2.5, and tested in 2.4 also.
Please apply.

	Jeff


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Linus, please do a

	bk pull bk://kernel.bkbits.net/jgarzik/misc-2.4

This will update the following files:

 Documentation/sysrq.txt |    4 ++++
 drivers/char/random.c   |    6 ++----
 fs/proc/proc_misc.c     |   28 ++++++++++++++++++++++++++++
 3 files changed, 34 insertions(+), 4 deletions(-)

through these ChangeSets:

<willy@debian.org> (03/03/28 1.1058)
   Reduce random.c stack usage

<akpm@digeo.com> (03/03/28 1.1057)
   /proc/sysrq-trigger: trigger sysrq functions via
   
   This makes sysrq facilities available to remote users.
   
   Writing a 'C' to /proc/sysrq-trigger receives the same treatment as typing
   sysrq-C on the local keyboard.


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diff -Nru a/Documentation/sysrq.txt b/Documentation/sysrq.txt
--- a/Documentation/sysrq.txt	Fri Mar 28 21:15:18 2003
+++ b/Documentation/sysrq.txt	Fri Mar 28 21:15:18 2003
@@ -36,6 +36,10 @@
 On other - If you know of the key combos for other architectures, please
            let me know so I can add them to this section.
 
+On all -  write a character to /proc/sysrq-trigger.  eg:
+
+		echo t > /proc/sysrq-trigger
+
 *  What are the 'command' keys?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 'r'     - Turns off keyboard raw mode and sets it to XLATE.
diff -Nru a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
--- a/fs/proc/proc_misc.c	Fri Mar 28 21:15:18 2003
+++ b/fs/proc/proc_misc.c	Fri Mar 28 21:15:18 2003
@@ -36,6 +36,7 @@
 #include <linux/init.h>
 #include <linux/smp_lock.h>
 #include <linux/seq_file.h>
+#include <linux/sysrq.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -532,6 +533,28 @@
 	write:		write_profile,
 };
 
+#ifdef CONFIG_MAGIC_SYSRQ
+/*
+ * writing 'C' to /proc/sysrq-trigger is like sysrq-C
+ */
+static ssize_t write_sysrq_trigger(struct file *file, const char *buf,
+				     size_t count, loff_t *ppos)
+{
+	if (count) {
+		char c;
+
+		if (get_user(c, buf))
+			return -EFAULT;
+		handle_sysrq(c, NULL, NULL, NULL);
+	}
+	return count;
+}
+
+static struct file_operations proc_sysrq_trigger_operations = {
+	.write		= write_sysrq_trigger,
+};
+#endif
+
 struct proc_dir_entry *proc_root_kcore;
 
 static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
@@ -608,6 +631,11 @@
 			entry->size = (1+prof_len) * sizeof(unsigned int);
 		}
 	}
+#ifdef CONFIG_MAGIC_SYSRQ
+	entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
+	if (entry)
+		entry->proc_fops = &proc_sysrq_trigger_operations;
+#endif
 #ifdef CONFIG_PPC32
 	{
 		extern struct file_operations ppc_htab_operations;

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diff -Nru a/drivers/char/random.c b/drivers/char/random.c
--- a/drivers/char/random.c	Fri Mar 28 21:15:26 2003
+++ b/drivers/char/random.c	Fri Mar 28 21:15:26 2003
@@ -1235,10 +1235,8 @@
  * at which point we do a "catastrophic reseeding".
  */
 static inline void xfer_secondary_pool(struct entropy_store *r,
-				       size_t nbytes)
+				       size_t nbytes, __u32 *tmp)
 {
-	__u32	tmp[TMP_BUF_SIZE];
-
 	if (r->entropy_count < nbytes * 8 &&
 	    r->entropy_count < r->poolinfo.POOLBITS) {
 		int nwords = min_t(int,
@@ -1291,7 +1289,7 @@
 		r->entropy_count = r->poolinfo.POOLBITS;
 
 	if (flags & EXTRACT_ENTROPY_SECONDARY)
-		xfer_secondary_pool(r, nbytes);
+		xfer_secondary_pool(r, nbytes, tmp);
 
 	DEBUG_ENT("%s has %d bits, want %d bits\n",
 		  r == sec_random_state ? "secondary" :