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From: Eliav Farber <farbere@amazon.com>
To: <gregkh@linuxfoundation.org>, <jdike@addtoit.com>,
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	David Laight <David.Laight@aculab.com>,
	Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Subject: [PATCH 10/19 5.15.y] minmax: don't use max() in situations that want a C constant expression
Date: Thu, 2 Oct 2025 20:47:24 +0000	[thread overview]
Message-ID: <20251002204733.35652-11-farbere@amazon.com> (raw)
In-Reply-To: <20251002204733.35652-1-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>
---
 drivers/input/touchscreen/cyttsp4_core.c | 2 +-
 drivers/irqchip/irq-sun6i-r.c            | 2 +-
 drivers/md/dm-integrity.c                | 2 +-
 fs/btrfs/tree-checker.c                  | 2 +-
 lib/vsprintf.c                           | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/input/touchscreen/cyttsp4_core.c b/drivers/input/touchscreen/cyttsp4_core.c
index dccbcb942fe5..936d69da3bda 100644
--- a/drivers/input/touchscreen/cyttsp4_core.c
+++ b/drivers/input/touchscreen/cyttsp4_core.c
@@ -871,7 +871,7 @@ static void cyttsp4_get_mt_touches(struct cyttsp4_mt_data *md, int num_cur_tch)
 	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++) {
diff --git a/drivers/irqchip/irq-sun6i-r.c b/drivers/irqchip/irq-sun6i-r.c
index 4cd3e533740b..74b1bd331425 100644
--- a/drivers/irqchip/irq-sun6i-r.c
+++ b/drivers/irqchip/irq-sun6i-r.c
@@ -268,7 +268,7 @@ static const struct irq_domain_ops sun6i_r_intc_domain_ops = {
 
 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. */
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 8e2b00536c3e..9e2bbfe328f0 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -1705,7 +1705,7 @@ static void integrity_metadata(struct work_struct *w)
 		struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
 		char *checksums;
 		unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
-		char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
+		char checksums_onstack[MAX(HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
 		sector_t sector;
 		unsigned sectors_to_process;
 
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 51e04efe3e20..8f96ddaceb9a 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -608,7 +608,7 @@ static int check_dir_item(struct extent_buffer *leaf,
 		 */
 		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);
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index d86abdc77c26..e46eb93c115d 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1100,7 +1100,7 @@ char *resource_string(char *buf, char *end, struct resource *res,
 #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);
-- 
2.47.3


  parent reply	other threads:[~2025-10-02 20:52 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-02 20:47 [PATCH 00/19 5.15.y] Backport minmax.h updates from v6.17-rc7 Eliav Farber
2025-10-02 20:47 ` [PATCH 01/19 5.15.y] minmax: add in_range() macro Eliav Farber
2025-10-02 20:47 ` [PATCH 02/19 5.15.y] minmax: Introduce {min,max}_array() Eliav Farber
2025-10-02 20:47 ` [PATCH 03/19 5.15.y] minmax: deduplicate __unconst_integer_typeof() Eliav Farber
2025-10-02 20:47 ` [PATCH 04/19 5.15.y] minmax: fix indentation of __cmp_once() and __clamp_once() Eliav Farber
2025-10-02 20:47 ` [PATCH 05/19 5.15.y] minmax: avoid overly complicated constant expressions in VM code Eliav Farber
2025-10-02 20:47 ` [PATCH 06/19 5.15.y] minmax: make generic MIN() and MAX() macros available everywhere Eliav Farber
2025-10-02 20:47 ` [PATCH 07/19 5.15.y] minmax: add a few more MIN_T/MAX_T users Eliav Farber
2025-10-02 20:47 ` [PATCH 08/19 5.15.y] minmax: simplify and clarify min_t()/max_t() implementation Eliav Farber
2025-10-02 20:47 ` [PATCH 09/19 5.15.y] minmax: simplify min()/max()/clamp() implementation Eliav Farber
2025-10-02 20:47 ` Eliav Farber [this message]
2025-10-02 20:47 ` [PATCH 11/19 5.15.y] minmax: improve macro expansion and type checking Eliav Farber
2025-10-02 20:47 ` [PATCH 12/19 5.15.y] minmax: fix up min3() and max3() too Eliav Farber
2025-10-02 20:47 ` [PATCH 13/19 5.15.y] minmax.h: add whitespace around operators and after commas Eliav Farber
2025-10-02 20:47 ` [PATCH 14/19 5.15.y] minmax.h: update some comments Eliav Farber
2025-10-02 20:47 ` [PATCH 15/19 5.15.y] minmax.h: reduce the #define expansion of min(), max() and clamp() Eliav Farber
2025-10-02 20:47 ` [PATCH 16/19 5.15.y] minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp() Eliav Farber
2025-10-02 20:47 ` [PATCH 17/19 5.15.y] minmax.h: move all the clamp() definitions after the min/max() ones Eliav Farber
2025-10-02 20:47 ` [PATCH 18/19 5.15.y] minmax.h: simplify the variants of clamp() Eliav Farber
2025-10-02 20:47 ` [PATCH 19/19 5.15.y] minmax.h: remove some #defines that are only expanded once Eliav Farber

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