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Subject[PATCH] /proc/sys/kernel/pointer_size

OProfile needs to know the pointer size being used for the kernel,
on platforms with 32-bit userspace and 64-bit kernel. This patch adds
a simple ro sysctl that exports this information as suggested by davem

thanks,
john


diff -X dontdiff -Naur linux-linus/include/linux/sysctl.h linux/include/linux/sysctl.h
--- linux-linus/include/linux/sysctl.h 2003-01-03 02:59:14.000000000 +0000
+++ linux/include/linux/sysctl.h 2003-01-03 03:14:44.000000000 +0000
@@ -129,6 +129,7 @@
KERN_CADPID=54, /* int: PID of the process to notify on CAD */
KERN_PIDMAX=55, /* int: PID # limit */
KERN_CORE_PATTERN=56, /* string: pattern for core-file names */
+ KERN_POINTER_SIZE=57, /* size_t: sizeof(void *) */
};


diff -X dontdiff -Naur linux-linus/kernel/sysctl.c linux/kernel/sysctl.c
--- linux-linus/kernel/sysctl.c 2002-12-16 04:09:26.000000000 +0000
+++ linux/kernel/sysctl.c 2002-12-16 04:13:58.000000000 +0000
@@ -56,6 +56,9 @@
extern int pid_max;
extern int sysctl_lower_zone_protection;

+/* Needed when user-space is 32-bit with 64-bit kernel */
+static int pointer_size = (int)sizeof(void *);
+
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
@@ -180,6 +183,8 @@
0644, NULL, &proc_dointvec},
{KERN_CAP_BSET, "cap-bound", &cap_bset, sizeof(kernel_cap_t),
0600, NULL, &proc_dointvec_bset},
+ {KERN_POINTER_SIZE, "pointer_size", &pointer_size, sizeof(int),
+ 0444, NULL, &proc_dointvec},
#ifdef CONFIG_BLK_DEV_INITRD
{KERN_REALROOTDEV, "real-root-dev", &real_root_dev, sizeof(int),
0644, NULL, &proc_dointvec},
-
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