| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250924202320.32333-3-farbere@amazon.com>
Date: Wed, 24 Sep 2025 20:23:03 +0000
From: Eliav Farber <farbere@...zon.com>
To: <linux@...linux.org.uk>, <richard@....at>,
<anton.ivanov@...bridgegreys.com>, <johannes@...solutions.net>,
<dave.hansen@...ux.intel.com>, <luto@...nel.org>, <peterz@...radead.org>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>, <x86@...nel.org>,
<hpa@...or.com>, <tony.luck@...el.com>, <qiuxu.zhuo@...el.com>,
<mchehab@...nel.org>, <james.morse@....com>, <rric@...nel.org>,
<harry.wentland@....com>, <sunpeng.li@....com>, <Rodrigo.Siqueira@....com>,
<alexander.deucher@....com>, <christian.koenig@....com>,
<Xinhui.Pan@....com>, <airlied@...il.com>, <daniel@...ll.ch>,
<evan.quan@....com>, <james.qian.wang@....com>, <liviu.dudau@....com>,
<mihail.atanassov@....com>, <brian.starkey@....com>,
<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
<tzimmermann@...e.de>, <robdclark@...il.com>, <quic_abhinavk@...cinc.com>,
<dmitry.baryshkov@...aro.org>, <sean@...rly.run>, <jdelvare@...e.com>,
<linux@...ck-us.net>, <linus.walleij@...aro.org>,
<dmitry.torokhov@...il.com>, <maz@...nel.org>, <wens@...e.org>,
<jernej.skrabec@...il.com>, <samuel@...lland.org>, <agk@...hat.com>,
<snitzer@...nel.org>, <dm-devel@...hat.com>, <rajur@...lsio.com>,
<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
<pabeni@...hat.com>, <peppe.cavallaro@...com>,
<alexandre.torgue@...s.st.com>, <joabreu@...opsys.com>,
<mcoquelin.stm32@...il.com>, <krzysztof.kozlowski@...aro.org>,
<malattia@...ux.it>, <hdegoede@...hat.com>, <markgross@...nel.org>,
<artur.paszkiewicz@...el.com>, <jejb@...ux.ibm.com>,
<martin.petersen@...cle.com>, <sakari.ailus@...ux.intel.com>,
<gregkh@...uxfoundation.org>, <fei1.li@...el.com>, <clm@...com>,
<josef@...icpanda.com>, <dsterba@...e.com>, <jack@...e.com>, <tytso@....edu>,
<adilger.kernel@...ger.ca>, <dushistov@...l.ru>,
<luc.vanoostenryck@...il.com>, <rostedt@...dmis.org>, <mhiramat@...nel.org>,
<pmladek@...e.com>, <senozhatsky@...omium.org>,
<andriy.shevchenko@...ux.intel.com>, <linux@...musvillemoes.dk>,
<minchan@...nel.org>, <ngupta@...are.org>, <akpm@...ux-foundation.org>,
<yoshfuji@...ux-ipv6.org>, <dsahern@...nel.org>, <pablo@...filter.org>,
<kadlec@...filter.org>, <fw@...len.de>, <jmaloy@...hat.com>,
<ying.xue@...driver.com>, <andrii@...nel.org>, <mykolal@...com>,
<ast@...nel.org>, <daniel@...earbox.net>, <martin.lau@...ux.dev>,
<song@...nel.org>, <yhs@...com>, <john.fastabend@...il.com>,
<kpsingh@...nel.org>, <sdf@...gle.com>, <haoluo@...gle.com>,
<jolsa@...nel.org>, <shuah@...nel.org>, <keescook@...omium.org>,
<wad@...omium.org>, <willy@...radead.org>, <farbere@...zon.com>,
<sashal@...nel.org>, <ruanjinjie@...wei.com>, <quic_akhilpo@...cinc.com>,
<David.Laight@...LAB.COM>, <herve.codina@...tlin.com>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<linux-um@...ts.infradead.org>, <linux-edac@...r.kernel.org>,
<amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
<linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
<linux-hwmon@...r.kernel.org>, <linux-input@...r.kernel.org>,
<linux-sunxi@...ts.linux.dev>, <linux-media@...r.kernel.org>,
<netdev@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
<platform-driver-x86@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
<linux-staging@...ts.linux.dev>, <linux-btrfs@...r.kernel.org>,
<linux-ext4@...r.kernel.org>, <linux-sparse@...r.kernel.org>,
<linux-mm@...ck.org>, <netfilter-devel@...r.kernel.org>,
<coreteam@...filter.org>, <tipc-discussion@...ts.sourceforge.net>,
<bpf@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
<stable@...r.kernel.org>
CC: Andy Shevchenko <andy.shevchenko@...il.com>, Christophe Leroy
<christophe.leroy@...roup.eu>
Subject: [PATCH 02/19 v6.1.y] minmax: Introduce {min,max}_array()
From: Herve Codina <herve.codina@...tlin.com>
[ Upstream commit c952c748c7a983a8bda9112984e6f2c1f6e441a5 ]
Introduce min_array() (resp max_array()) in order to get the
minimal (resp maximum) of values present in an array.
Signed-off-by: Herve Codina <herve.codina@...tlin.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
Link: https://lore.kernel.org/r/20230623085830.749991-8-herve.codina@bootlin.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Eliav Farber <farbere@...zon.com>
---
include/linux/minmax.h | 64 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index d4bc394b449e..aac0b7d23768 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -168,6 +168,70 @@
*/
#define max_t(type, x, y) __careful_cmp(max, (type)(x), (type)(y))
+/*
+ * Remove a const qualifier from integer types
+ * _Generic(foo, type-name: association, ..., default: association) performs a
+ * comparison against the foo type (not the qualified type).
+ * Do not use the const keyword in the type-name as it will not match the
+ * unqualified type of foo.
+ */
+#define __unconst_integer_type_cases(type) \
+ unsigned type: (unsigned type)0, \
+ signed type: (signed type)0
+
+#define __unconst_integer_typeof(x) typeof( \
+ _Generic((x), \
+ char: (char)0, \
+ __unconst_integer_type_cases(char), \
+ __unconst_integer_type_cases(short), \
+ __unconst_integer_type_cases(int), \
+ __unconst_integer_type_cases(long), \
+ __unconst_integer_type_cases(long long), \
+ default: (x)))
+
+/*
+ * Do not check the array parameter using __must_be_array().
+ * In the following legit use-case where the "array" passed is a simple pointer,
+ * __must_be_array() will return a failure.
+ * --- 8< ---
+ * int *buff
+ * ...
+ * min = min_array(buff, nb_items);
+ * --- 8< ---
+ *
+ * The first typeof(&(array)[0]) is needed in order to support arrays of both
+ * 'int *buff' and 'int buff[N]' types.
+ *
+ * The array can be an array of const items.
+ * typeof() keeps the const qualifier. Use __unconst_integer_typeof() in order
+ * to discard the const qualifier for the __element variable.
+ */
+#define __minmax_array(op, array, len) ({ \
+ typeof(&(array)[0]) __array = (array); \
+ typeof(len) __len = (len); \
+ __unconst_integer_typeof(__array[0]) __element = __array[--__len]; \
+ while (__len--) \
+ __element = op(__element, __array[__len]); \
+ __element; })
+
+/**
+ * min_array - return minimum of values present in an array
+ * @array: array
+ * @len: array length
+ *
+ * Note that @len must not be zero (empty array).
+ */
+#define min_array(array, len) __minmax_array(min, array, len)
+
+/**
+ * max_array - return maximum of values present in an array
+ * @array: array
+ * @len: array length
+ *
+ * Note that @len must not be zero (empty array).
+ */
+#define max_array(array, len) __minmax_array(max, array, len)
+
/**
* clamp_t - return a value clamped to a given range using a given type
* @type: the type of variable to use
--
2.47.3
Powered by blists - more mailing lists