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Message-ID: <877h1ytu4d.fsf@rustcorp.com.au>
Date: Thu, 15 Dec 2011 13:32:26 +1030
From: Rusty Russell <rusty@...tcorp.com.au>
To: linux-kernel@...r.kernel.org
Cc: alsa-devel@...a-project.org
Subject: [PATCH 2/15] module_param: avoid bool abuse, add bint for special cases.
For historical reasons, we allow module_param(bool) to take an int (or
an unsigned int). That's going away.
A few drivers really want an int: they set it to -1 and a parameter
will set it to 0 or 1. This sucks: reading them from sysfs will give
'Y' for both -1 and 1, but if we change it to an int, then the users
might be broken (if they did "param" instead of "param=1").
Use a new 'bint' parser for them.
(ntfs has a different problem: it needs an int for debug_msgs because
it's also exposed via sysctl.)
Cc: Steve Glendinning <steve.glendinning@...c.com>
Cc: Jean Delvare <khali@...ux-fr.org>
Cc: Guenter Roeck <guenter.roeck@...csson.com>
Cc: Hoang-Nam Nguyen <hnguyen@...ibm.com>
Cc: Christoph Raisch <raisch@...ibm.com>
Cc: Roland Dreier <roland@...nel.org>
Cc: Sean Hefty <sean.hefty@...el.com>
Cc: Hal Rosenstock <hal.rosenstock@...il.com>
Cc: linux390@...ibm.com
Cc: Anton Altaparmakov <anton@...era.com>
Cc: Jaroslav Kysela <perex@...ex.cz>
Cc: Takashi Iwai <tiwai@...e.de>
Cc: lm-sensors@...sensors.org
Cc: linux-rdma@...r.kernel.org
Cc: linux-s390@...r.kernel.org
Cc: linux-ntfs-dev@...ts.sourceforge.net
Cc: alsa-devel@...a-project.org
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
drivers/hwmon/emc2103.c | 2 +-
drivers/infiniband/hw/ehca/ehca_main.c | 2 +-
drivers/s390/cio/cmf.c | 2 +-
fs/ntfs/super.c | 2 +-
include/linux/moduleparam.h | 6 ++++++
kernel/params.c | 24 ++++++++++++++++++++++++
sound/pci/intel8x0.c | 4 ++--
7 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/drivers/hwmon/emc2103.c b/drivers/hwmon/emc2103.c
--- a/drivers/hwmon/emc2103.c
+++ b/drivers/hwmon/emc2103.c
@@ -55,7 +55,7 @@ static const u8 REG_TEMP_MAX[4] = { 0x34
* it. Default is to leave the device in the state it's already in (-1).
* This parameter allows APD mode to be optionally forced on or off */
static int apd = -1;
-module_param(apd, bool, 0);
+module_param(apd, bint, 0);
MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode");
struct temperature {
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -82,7 +82,7 @@ module_param_named(port_act_time, ehca_p
module_param_named(poll_all_eqs, ehca_poll_all_eqs, bool, S_IRUGO);
module_param_named(static_rate, ehca_static_rate, int, S_IRUGO);
module_param_named(scaling_code, ehca_scaling_code, bool, S_IRUGO);
-module_param_named(lock_hcalls, ehca_lock_hcalls, bool, S_IRUGO);
+module_param_named(lock_hcalls, ehca_lock_hcalls, bint, S_IRUGO);
module_param_named(number_of_cqs, ehca_max_cq, int, S_IRUGO);
module_param_named(number_of_qps, ehca_max_qp, int, S_IRUGO);
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -98,7 +98,7 @@ enum cmb_format {
* enum cmb_format.
*/
static int format = CMF_AUTODETECT;
-module_param(format, bool, 0444);
+module_param(format, bint, 0444);
/**
* struct cmb_operations - functions to use depending on cmb_format
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -3198,7 +3198,7 @@ MODULE_DESCRIPTION("NTFS 1.2/3.x driver
MODULE_VERSION(NTFS_VERSION);
MODULE_LICENSE("GPL");
#ifdef DEBUG
-module_param(debug_msgs, bool, 0);
+module_param(debug_msgs, bint, 0);
MODULE_PARM_DESC(debug_msgs, "Enable debug messages.");
#endif
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -367,6 +367,12 @@ extern int param_set_invbool(const char
extern int param_get_invbool(char *buffer, const struct kernel_param *kp);
#define param_check_invbool(name, p) __param_check(name, p, bool)
+/* An int, which can only be set like a bool (though it shows as an int). */
+extern struct kernel_param_ops param_ops_bint;
+extern int param_set_bint(const char *val, const struct kernel_param *kp);
+#define param_get_bint param_get_int
+#define param_check_bint param_check_int
+
/**
* module_param_array - a parameter which is an array of some type
* @name: the name of the array variable
diff --git a/kernel/params.c b/kernel/params.c
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -369,6 +369,30 @@ struct kernel_param_ops param_ops_invboo
};
EXPORT_SYMBOL(param_ops_invbool);
+int param_set_bint(const char *val, const struct kernel_param *kp)
+{
+ struct kernel_param boolkp;
+ bool v;
+ int ret;
+
+ /* Match bool exactly, by re-using it. */
+ boolkp = *kp;
+ boolkp.arg = &v;
+ boolkp.flags |= KPARAM_ISBOOL;
+
+ ret = param_set_bool(val, &boolkp);
+ if (ret == 0)
+ *(int *)kp->arg = v;
+ return ret;
+}
+EXPORT_SYMBOL(param_set_bint);
+
+struct kernel_param_ops param_ops_bint = {
+ .set = param_set_bint,
+ .get = param_get_int,
+};
+EXPORT_SYMBOL(param_ops_bint);
+
/* We break the rule and mangle the string. */
static int param_array(const char *name,
const char *val,
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -95,13 +95,13 @@ module_param(ac97_quirk, charp, 0444);
MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
module_param(buggy_semaphore, bool, 0444);
MODULE_PARM_DESC(buggy_semaphore, "Enable workaround for hardwares with problematic codec semaphores.");
-module_param(buggy_irq, bool, 0444);
+module_param(buggy_irq, bint, 0444);
MODULE_PARM_DESC(buggy_irq, "Enable workaround for buggy interrupts on some motherboards.");
module_param(xbox, bool, 0444);
MODULE_PARM_DESC(xbox, "Set to 1 for Xbox, if you have problems with the AC'97 codec detection.");
module_param(spdif_aclink, int, 0444);
MODULE_PARM_DESC(spdif_aclink, "S/PDIF over AC-link.");
-module_param(inside_vm, bool, 0444);
+module_param(inside_vm, bint, 0444);
MODULE_PARM_DESC(inside_vm, "KVM/Parallels optimization.");
/* just for backward compatibility */
--
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