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Message-Id: <20210813151734.1236324-3-jim.cromie@gmail.com>
Date: Fri, 13 Aug 2021 09:17:10 -0600
From: Jim Cromie <jim.cromie@...il.com>
To: gregkh@...uxfoundation.org, seanpaul@...omium.org,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>,
Zhenyu Wang <zhenyuw@...ux.intel.com>,
Zhi Wang <zhi.a.wang@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Jason Baron <jbaron@...mai.com>,
Hawking Zhang <Hawking.Zhang@....com>,
Tao Zhou <tao.zhou1@....com>, Huang Rui <ray.huang@....com>,
Likun Gao <Likun.Gao@....com>,
Chengming Gui <Jack.Gui@....com>,
Aaron Liu <aaron.liu@....com>,
Jim Cromie <jim.cromie@...il.com>,
John Clements <john.clements@....com>,
Kevin Wang <kevin1.wang@....com>,
Ashley Thomas <Ashley.Thomas2@....com>,
Qingqing Zhuo <qingqing.zhuo@....com>,
Wyatt Wood <Wyatt.Wood@....com>,
Aurabindo Pillai <aurabindo.pillai@....com>,
Johan Hovold <johan@...nel.org>, Jessica Yu <jeyu@...nel.org>,
Nick Desaulniers <ndesaulniers@...ogle.com>,
Joe Perches <joe@...ches.com>, Miguel Ojeda <ojeda@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Thomas Gleixner <tglx@...utronix.de>,
Vitor Massaru Iha <vitor@...saru.org>,
Sedat Dilek <sedat.dilek@...il.com>,
Zhen Lei <thunder.leizhen@...wei.com>,
Marco Elver <elver@...gle.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Alexander Potapenko <glider@...gle.com>,
Palmer Dabbelt <palmerdabbelt@...gle.com>,
Patricia Alfonso <trishalfonso@...gle.com>,
Jiri Olsa <jolsa@...nel.org>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Arvind Sankar <nivedita@...m.mit.edu>,
Johannes Berg <johannes.berg@...el.com>,
Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
intel-gvt-dev@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org
Subject: [PATCH v5 2/9] moduleparam: add data member to struct kernel_param
Add a const void* data member to the struct, to allow attaching
private data that will be used soon by a setter method (via kp->data)
to perform more elaborate actions.
To attach the data at compile time, add new macros:
module_param_cbd() derives from module_param_cb(), adding data param,
and latter is redefined to use former.
It calls __module_param_call_wdata(), which accepts a new data param
and inits .data with it. Re-define __module_param_call() to use it.
Use of this new data member will be rare, it might be worth redoing
this as a separate/sub-type to de-bloat the base case.
---
v4+:
. const void* data - <emil.l.velikov@...il.com>
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
include/linux/moduleparam.h | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index eed280fae433..878387e0b2d9 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -78,6 +78,7 @@ struct kernel_param {
const struct kparam_string *str;
const struct kparam_array *arr;
};
+ const void *data;
};
extern const struct kernel_param __start___param[], __stop___param[];
@@ -175,6 +176,9 @@ struct kparam_array
#define module_param_cb(name, ops, arg, perm) \
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0)
+#define module_param_cbd(name, ops, arg, perm, data) \
+ __module_param_call_wdata(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0, data)
+
#define module_param_cb_unsafe(name, ops, arg, perm) \
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, \
KERNEL_PARAM_FL_UNSAFE)
@@ -284,14 +288,17 @@ struct kparam_array
/* This is the fundamental function for registering boot/module
parameters. */
-#define __module_param_call(prefix, name, ops, arg, perm, level, flags) \
+#define __module_param_call(prefix, name, ops, arg, perm, level, flags) \
+ __module_param_call_wdata(prefix, name, ops, arg, perm, level, flags, NULL)
+
+#define __module_param_call_wdata(prefix, name, ops, arg, perm, level, flags, data) \
/* Default value instead of permissions? */ \
static const char __param_str_##name[] = prefix #name; \
static struct kernel_param __moduleparam_const __param_##name \
__used __section("__param") \
__aligned(__alignof__(struct kernel_param)) \
= { __param_str_##name, THIS_MODULE, ops, \
- VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg } }
+ VERIFY_OCTAL_PERMISSIONS(perm), level, flags, { arg }, data }
/* Obsolete - use module_param_cb() */
#define module_param_call(name, _set, _get, arg, perm) \
--
2.31.1
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