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Mon, 29 Sep 2025 13:57:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1759154230; bh=Iw0YhrWhdNpS0HjSK2DGUdg/swwwBsFtqtcexgLRYao=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=fhwJC0Q3xoYO9xAtpXHEmEgtqPtaG7WyYprbrGEvIXEr1UBEoxoiDoVf0J3fUBf0S FID17lhWptY3RNW9HNAlZNi0tv6xwX70LznTlXBjFeJUN+3NPDLDor44Gw6GTuddGf BApVsjN1EH2JCUlxOFWZhDbmVfpV3GD8BmMzPaU0= Subject: Patch "minmax: simplify and clarify min_t()/max_t() implementation" has been added to the 6.1-stable tree To: David.Laight@ACULAB.COM, David.Laight@aculab.com, Rodrigo.Siqueira@amd.com, Xinhui.Pan@amd.com, adilger.kernel@dilger.ca, agk@redhat.com, airlied@gmail.com, akpm@linux-foundation.org, alexander.deucher@amd.com, alexandre.torgue@foss.st.com, amd-gfx@lists.freedesktop.org, andrii@kernel.org, andriy.shevchenko@linux.intel.com, anton.ivanov@cambridgegreys.com, artur.paszkiewicz@intel.com, ast@kernel.org, bp@alien8.de, brian.starkey@arm.com, christian.koenig@amd.com, clm@fb.com, coreteam@netfilter.org, daniel@ffwll.ch, daniel@iogearbox.net, dave.hansen@linux.intel.com, davem@davemloft.net, dm-devel@redhat.com, dmitry.baryshkov@linaro.org, dmitry.torokhov@gmail.com, dri-devel@lists.freedesktop.org, dsahern@kernel.org, dsterba@suse.com, dushistov@mail.ru, edumazet@google.com, evan.quan@amd.com, farbere@amazon.com, fei1.li@intel.com, freedreno@lists.freedesktop.org, fw@strlen.de, gregkh@linuxfoundation.org, haoluo@google.com, harry.wentland@amd.com, hdegoede@redhat.com, herve.codina@bootlin.com, hpa@zytor.com, jack@suse.com, james.morse@arm.com, james.qian.wang@arm.com, jdelvare@suse.com, jejb@linux.ibm.com, jernej.skrabec@gmail.com, jmaloy@redhat.com, joabreu@synopsys.com, johannes@sipsolutions.net, john.fastabend@gmail.com, jolsa@kernel.org, josef@toxicpanda.com, kadlec@netfilter.org, keescook@chromium.org, kpsingh@kernel.org, krzysztof.kozlowski@linaro.org, kuba@kernel.org, linus.walleij@linaro.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-staging@lists.linux.dev, linux-stm32@st-md-mailman.stormreply.com, linux-sunxi@lists.linux.dev, linux-um@lists.infradead.org, linux@armlinux.org.uk, linux@rasmusvillemoes.dk, linux@roeck-us.net, liviu.dudau@arm.com, lorenzo.stoakes@oracle.com, luc.vanoostenryck@gmail.com, luto@kernel.org, maarten.lankhorst@linux.intel.com, malattia@linux.it, markgross@kernel.org, martin.lau@linux.dev, martin.petersen@oracle.com, maz@kernel.org, mchehab@kernel.org, mcoquelin.stm32@gmail.com, mhiramat@kernel.org, mihail.atanassov@arm.com, minchan@kernel.org, mingo@redhat.com, mripard@kernel.org, mykolal@fb.co, m@kvack.org, ngupta@vflare.org, pabeni@redhat.com, pablo@netfilter.org, peppe.cavallaro@st.com, peterz@infradead.org, pmladek@suse.com, qiuxu.zhuo@intel.com, quic_abhinavk@quicinc.com, quic_akhilpo@quicinc.com, rajur@chelsio.com, richard@nod.at, robdclark@gmail.com, rostedt@goodmis.org, rric@kernel.org, ruanjinjie@huawei.com, sakari.ailus@linux.intel.com, samuel@sholland.org, sashal@kernel.org, sdf@google.com, sean@poorly.run, senozhatsky@chromium.org, shuah@kernel.org, snitzer@kernel.org, song@kernel.org, sunpeng.li@amd.com, tglx@linutronix.de, tipc-discussion@lists.sourceforge.net, tony.luck@intel.com, torvalds@linux-foundation.org, tytso@mit.edu, tzimmermann@suse.de, wad@chromium.org, wens@csie.org, willy@infradead.org, x86@kernel.org, yhs@fb.com, ying.xue@windriver.com, yoshfuji@linux-ipv6.org Cc: From: Date: Mon, 29 Sep 2025 15:56:59 +0200 In-Reply-To: <20250924202320.32333-7-farbere@amazon.com> Message-ID: <2025092959-cocoa-slinky-85c4@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: E24A1180009 X-Stat-Signature: 1htd8e5c61a8adjh3cxgnru3713bsj15 X-HE-Tag: 1759154231-340458 X-HE-Meta: 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 02Vlvzbt A/sA+8BFgSPU2OqZT3EdQlgPj70I0EZdSwLkXuxQNitqrpOlWYKXITdh566jBI3qpqJO01l1lIZxOuDXVeswhmM5iQ9g32Rl1JyNxpoOtC3xuHbo/6psEB9/T13Pks+57PWA2Sthso2rBAZQjgklyJPpApIATpmTPQNA1UeosdhSYzyhKLMC7ngpuy08/ToCekXPf2MiVbsA2SyOBWzLSrEhfBWliZse0p1mTXFq9hc8tmcE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is a note to let you know that I've just added the patch titled minmax: simplify and clarify min_t()/max_t() implementation to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: minmax-simplify-and-clarify-min_t-max_t-implementation.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From linux-staging+bounces-34580-greg=kroah.com@lists.linux.dev Wed Sep 24 22:29:02 2025 From: Eliav Farber Date: Wed, 24 Sep 2025 20:23:07 +0000 Subject: minmax: simplify and clarify min_t()/max_t() implementation To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Cc: Linus Torvalds , David Laight , Lorenzo Stoakes Message-ID: <20250924202320.32333-7-farbere@amazon.com> From: Linus Torvalds [ Upstream commit 017fa3e89187848fd056af757769c9e66ac3e93d ] This simplifies the min_t() and max_t() macros by no longer making them work in the context of a C constant expression. That means that you can no longer use them for static initializers or for array sizes in type definitions, but there were only a couple of such uses, and all of them were converted (famous last words) to use MIN_T/MAX_T instead. Cc: David Laight Cc: Lorenzo Stoakes Signed-off-by: Linus Torvalds Signed-off-by: Eliav Farber Signed-off-by: Greg Kroah-Hartman --- include/linux/minmax.h | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) --- a/include/linux/minmax.h +++ b/include/linux/minmax.h @@ -45,17 +45,20 @@ #define __cmp(op, x, y) ((x) __cmp_op_##op (y) ? (x) : (y)) -#define __cmp_once(op, x, y, unique_x, unique_y) ({ \ - typeof(x) unique_x = (x); \ - typeof(y) unique_y = (y); \ +#define __cmp_once_unique(op, type, x, y, ux, uy) \ + ({ type ux = (x); type uy = (y); __cmp(op, ux, uy); }) + +#define __cmp_once(op, type, x, y) \ + __cmp_once_unique(op, type, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_)) + +#define __careful_cmp_once(op, x, y) ({ \ static_assert(__types_ok(x, y), \ #op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \ - __cmp(op, unique_x, unique_y); }) + __cmp_once(op, __auto_type, x, y); }) #define __careful_cmp(op, x, y) \ __builtin_choose_expr(__is_constexpr((x) - (y)), \ - __cmp(op, x, y), \ - __cmp_once(op, x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y))) + __cmp(op, x, y), __careful_cmp_once(op, x, y)) #define __clamp(val, lo, hi) \ ((val) >= (hi) ? (hi) : ((val) <= (lo) ? (lo) : (val))) @@ -158,7 +161,7 @@ * @x: first value * @y: second value */ -#define min_t(type, x, y) __careful_cmp(min, (type)(x), (type)(y)) +#define min_t(type, x, y) __cmp_once(min, type, x, y) /** * max_t - return maximum of two values, using the specified type @@ -166,7 +169,7 @@ * @x: first value * @y: second value */ -#define max_t(type, x, y) __careful_cmp(max, (type)(x), (type)(y)) +#define max_t(type, x, y) __cmp_once(max, type, x, y) /* * Do not check the array parameter using __must_be_array(). Patches currently in stable-queue which might be from farbere@amazon.com are queue-6.1/minmax-add-a-few-more-min_t-max_t-users.patch queue-6.1/minmax-fix-indentation-of-__cmp_once-and-__clamp_once.patch queue-6.1/minmax-add-in_range-macro.patch queue-6.1/minmax-deduplicate-__unconst_integer_typeof.patch queue-6.1/minmax-simplify-and-clarify-min_t-max_t-implementation.patch queue-6.1/minmax-avoid-overly-complicated-constant-expressions-in-vm-code.patch queue-6.1/minmax-introduce-min-max-_array.patch