Patch "minmax: don't use max() in situations that want a C constant expression" has been added to the 6.6-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    minmax: don't use max() in situations that want a C constant expression

to the 6.6-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-don-t-use-max-in-situations-that-want-a-c-constant-expression.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From linux-staging+bounces-34541-greg=kroah.com@lists.linux.dev Mon Sep 22 12:38:18 2025
From: Eliav Farber <farbere@amazon.com>
Date: Mon, 22 Sep 2025 10:32:32 +0000
Subject: minmax: don't use max() in situations that want a C constant expression
To: <richard@nod.at>, <anton.ivanov@cambridgegreys.com>, <johannes@sipsolutions.net>, <dave.hansen@linux.intel.com>, <luto@kernel.org>, <peterz@infradead.org>, <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>, <x86@kernel.org>, <hpa@zytor.com>, <tony.luck@intel.com>, <qiuxu.zhuo@intel.com>, <james.morse@arm.com>, <mchehab@kernel.org>, <rric@kernel.org>, <harry.wentland@amd.com>, <sunpeng.li@amd.com>, <Rodrigo.Siqueira@amd.com>, <alexander.deucher@amd.com>, <christian.koenig@amd.com>, <Xinhui.Pan@amd.com>, <airlied@gmail.com>, <daniel@ffwll.ch>, <evan.quan@amd.com>, <maarten.lankhorst@linux.intel.com>, <mripard@kernel.org>, <tzimmermann@suse.de>, <jdelvare@suse.com>, <linux@roeck-us.net>, <linus.walleij@linaro.org>, <dmitry.torokhov@gmail.com>, <wens@csie.org>, <jernej.skrabec@gmail.com>, <samuel@sholland.org>, <agk@redhat.com>, <snitzer@kernel.org>, <dm-devel@lists.linux.dev>, <mailhol.vincent@wanadoo.fr>, <wg@grandegger.com>, <mkl@pengutronix.de>, <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>, <alexandre.torgue@foss.st.com>, <joabreu@synopsys.com>, <mcoquelin.stm32@gmail.com>, <krzysztof.kozlowski@linaro.org>, <malattia@linux.it>, <hdegoede@redhat.com>, <ilpo.jarvinen@linux.intel.com>, <markgross@kernel.org>, <artur.paszkiewicz@intel.com>, <jejb@linux.ibm.com>, <martin.petersen@oracle.com>, <sakari.ailus@linux.intel.com>, <gregkh@linuxfoundation.org>, <clm@fb.com>, <josef@toxicpanda.com>, <dsterba@suse.com>, <luc.vanoostenryck@gmail.com>, <rostedt@goodmis.org>, <mhiramat@kernel.org>, <pmladek@suse.com>, <andriy.shevchenko@linux.intel.com>, <linux@rasmusvillemoes.dk>, <senozhatsky@chromium.org>, <minchan@kernel.org>, <akpm@linux-foundation.org>, <dsahern@kernel.org>, <shuah@kernel.org>, <keescook@chromium.org>, <wad@chromium.org>, <farbere@amazon.com>, <David.Laight@ACULAB.COM>, <arnd@kernel.org>, <linux-um@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <linux-edac@vger.kernel.org>, <amd-gfx@lists.freedesktop.org>, <dri-devel@lists.freedesktop.org>, <linux-hwmon@vger.kernel.org>, <linux-input@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-sunxi@lists.linux.dev>, <linux-media@vger.kernel.org>, <linux-can@vger.kernel.org>, <netdev@vger.kernel.org>, <linux-stm32@st-md-mailman.stormreply.com>, <platform-driver-x86@vger.kernel.org>, <linux-scsi@vger.kernel.org>, <linux-staging@lists.linux.dev>, <linux-btrfs@vger.kernel.org>, <linux-sparse@vger.kernel.org>, <linux-trace-kernel@vger.kernel.org>, <linux-mm@kvack.org>, <linux-kselftest@vger.kernel.org>, <bpf@vger.kernel.org>, <stable@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, David Laight <David.Laight@aculab.com>, Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Message-ID: <20250922103241.16213-7-farbere@amazon.com>

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit cb04e8b1d2f24c4c2c92f7b7529031fc35a16fed ]

We only had a couple of array[] declarations, and changing them to just
use 'MAX()' instead of 'max()' fixes the issue.

This will allow us to simplify our min/max macros enormously, since they
can now unconditionally use temporary variables to avoid using the
argument values multiple times.

Cc: David Laight <David.Laight@aculab.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Eliav Farber <farbere@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c         |    2 +-
 drivers/input/touchscreen/cyttsp4_core.c       |    2 +-
 drivers/irqchip/irq-sun6i-r.c                  |    2 +-
 drivers/net/can/usb/etas_es58x/es58x_devlink.c |    2 +-
 fs/btrfs/tree-checker.c                        |    2 +-
 lib/vsprintf.c                                 |    2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c
@@ -708,7 +708,7 @@ static const char *smu_get_feature_name(
 size_t smu_cmn_get_pp_feature_mask(struct smu_context *smu,
 				   char *buf)
 {
-	int8_t sort_feature[max(SMU_FEATURE_COUNT, SMU_FEATURE_MAX)];
+	int8_t sort_feature[MAX(SMU_FEATURE_COUNT, SMU_FEATURE_MAX)];
 	uint64_t feature_mask;
 	int i, feature_index;
 	uint32_t count = 0;
--- a/drivers/input/touchscreen/cyttsp4_core.c
+++ b/drivers/input/touchscreen/cyttsp4_core.c
@@ -871,7 +871,7 @@ static void cyttsp4_get_mt_touches(struc
 	struct cyttsp4_touch tch;
 	int sig;
 	int i, j, t = 0;
-	int ids[max(CY_TMA1036_MAX_TCH, CY_TMA4XX_MAX_TCH)];
+	int ids[MAX(CY_TMA1036_MAX_TCH, CY_TMA4XX_MAX_TCH)];
 
 	memset(ids, 0, si->si_ofs.tch_abs[CY_TCH_T].max * sizeof(int));
 	for (i = 0; i < num_cur_tch; i++) {
--- a/drivers/irqchip/irq-sun6i-r.c
+++ b/drivers/irqchip/irq-sun6i-r.c
@@ -270,7 +270,7 @@ static const struct irq_domain_ops sun6i
 
 static int sun6i_r_intc_suspend(void)
 {
-	u32 buf[BITS_TO_U32(max(SUN6I_NR_TOP_LEVEL_IRQS, SUN6I_NR_MUX_BITS))];
+	u32 buf[BITS_TO_U32(MAX(SUN6I_NR_TOP_LEVEL_IRQS, SUN6I_NR_MUX_BITS))];
 	int i;
 
 	/* Wake IRQs are enabled during system sleep and shutdown. */
--- a/drivers/net/can/usb/etas_es58x/es58x_devlink.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_devlink.c
@@ -215,7 +215,7 @@ static int es58x_devlink_info_get(struct
 	struct es58x_sw_version *fw_ver = &es58x_dev->firmware_version;
 	struct es58x_sw_version *bl_ver = &es58x_dev->bootloader_version;
 	struct es58x_hw_revision *hw_rev = &es58x_dev->hardware_revision;
-	char buf[max(sizeof("xx.xx.xx"), sizeof("axxx/xxx"))];
+	char buf[MAX(sizeof("xx.xx.xx"), sizeof("axxx/xxx"))];
 	int ret = 0;
 
 	if (es58x_sw_version_is_valid(fw_ver)) {
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -614,7 +614,7 @@ static int check_dir_item(struct extent_
 		 */
 		if (key->type == BTRFS_DIR_ITEM_KEY ||
 		    key->type == BTRFS_XATTR_ITEM_KEY) {
-			char namebuf[max(BTRFS_NAME_LEN, XATTR_NAME_MAX)];
+			char namebuf[MAX(BTRFS_NAME_LEN, XATTR_NAME_MAX)];
 
 			read_extent_buffer(leaf, namebuf,
 					(unsigned long)(di + 1), name_len);
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1079,7 +1079,7 @@ char *resource_string(char *buf, char *e
 #define FLAG_BUF_SIZE		(2 * sizeof(res->flags))
 #define DECODED_BUF_SIZE	sizeof("[mem - 64bit pref window disabled]")
 #define RAW_BUF_SIZE		sizeof("[mem - flags 0x]")
-	char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
+	char sym[MAX(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
 		     2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
 
 	char *p = sym, *pend = sym + sizeof(sym);


Patches currently in stable-queue which might be from farbere@amazon.com are

queue-6.6/minmax-don-t-use-max-in-situations-that-want-a-c-constant-expression.patch
queue-6.6/minmax-make-generic-min-and-max-macros-available-everywhere.patch
queue-6.6/minmax-fix-up-min3-and-max3-too.patch
queue-6.6/minmax-add-a-few-more-min_t-max_t-users.patch
queue-6.6/minmax-improve-macro-expansion-and-type-checking.patch
queue-6.6/minmax-avoid-overly-complicated-constant-expressions-in-vm-code.patch
queue-6.6/minmax-simplify-min-max-clamp-implementation.patch
queue-6.6/minmax-simplify-and-clarify-min_t-max_t-implementation.patch