openwrt/package/kernel/mwlwifi/patches/030-remove-MAX-a-b-macro-to-avoid-conflict-with-kernel.h.patch

From 8c19700558b154b4898e49014b9a9725dabadddb Mon Sep 17 00:00:00 2001
From: Stefan Kalscheuer <[email protected]>
Date: Sat, 31 May 2025 16:52:23 +0200
Subject: [PATCH] remove MAX(a,b) macro to avoid conflict with
 kernel.h/minmax.h

Building against recent kernel versions (noticed with 6.12) and -Werror
can fail because a macro MAX(a,b) is already defined in minmax.h or
kernel.h before 5.10.

In file included from ../mwlwifi-2025.02.06~db97edf2/hif/fwcmd.h:23,
                 from ../mwlwifi-2025.02.06~db97edf2/core.c:25:
../mwlwifi-2025.02.06~db97edf2/hif/hostcmd.h:1124:9: error: "MAX" redefined [-Werror]
 1124 | #define MAX(a, b) (((a) > (b)) ? (a) : (b))
      |         ^~~
In file included from usr/include/mac80211-backport/linux/minmax.h:4,
                 from ./include/linux/kernel.h:28,
                 from usr/include/mac80211-backport/linux/kernel.h:3,
                 from ./include/linux/skbuff.h:13,
                 from usr/include/mac80211-backport/linux/skbuff.h:3,
                 from ./include/linux/if_ether.h:19,
                 from usr/include/mac80211-backport/linux/if_ether.h:3,
                 from ./include/linux/etherdevice.h:20,
                 from usr/include/mac80211-backport/linux/etherdevice.h:3,
                 from ../mwlwifi-2025.02.06~db97edf2/core.c:18:
./include/linux/minmax.h:330:9: note: this is the location of the previous definition
  330 | #define MAX(a,b) __cmp(max,a,b)
      |         ^~~

This macro is not used anywhere else but in the very next line, so
instead of adding conditionals, let's expand MAX_GROUP_PER_CHANNEL_RATE
and drop the definition of MAX.

Signed-off-by: Stefan Kalscheuer <[email protected]>
---
 hif/hostcmd.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/hif/hostcmd.h
+++ b/hif/hostcmd.h
@@ -1121,9 +1121,8 @@ struct hostcmd_cmd_get_fw_region_code_sc
 #define HAL_TRPC_ID_MAX_SC4        32
 #define MAX_GROUP_PER_CHANNEL_5G   39
 #define MAX_GROUP_PER_CHANNEL_2G   21
-#define	MAX(a, b) (((a) > (b)) ? (a) : (b))
 #define MAX_GROUP_PER_CHANNEL_RATE \
-	MAX(MAX_GROUP_PER_CHANNEL_5G, MAX_GROUP_PER_CHANNEL_2G)
+	((MAX_GROUP_PER_CHANNEL_5G > MAX_GROUP_PER_CHANNEL_2G) ? MAX_GROUP_PER_CHANNEL_5G : MAX_GROUP_PER_CHANNEL_2G)
 
 struct channel_power_tbl_sc4 {
 	u8 channel;