+ mm-simplify-min_brk-handling-in-brk.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: simplify min_brk handling in brk()
has been added to the -mm mm-new branch.  Its filename is
     mm-simplify-min_brk-handling-in-brk.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-simplify-min_brk-handling-in-brk.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
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------------------------------------------------------
From: Xuanye Liu <liuqiye2025@163.com>
Subject: mm: simplify min_brk handling in brk()
Date: Thu, 10 Jul 2025 10:58:58 +0800

Set min_brk to mm->start_brk by default, and override it with mm->end_data
only when CONFIG_COMPAT_BRK is enabled and brk_randomized is false.

This makes the logic clearer with no functional change.

Link: https://lkml.kernel.org/r/20250710025859.926355-1-liuqiye2025@163.com
Signed-off-by: Xuanye Liu <liuqiye2025@163.com>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Jann Horn <jannh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/mm/mmap.c~mm-simplify-min_brk-handling-in-brk
+++ a/mm/mmap.c
@@ -127,18 +127,15 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
 
 	origbrk = mm->brk;
 
+	min_brk = mm->start_brk;
 #ifdef CONFIG_COMPAT_BRK
 	/*
 	 * CONFIG_COMPAT_BRK can still be overridden by setting
 	 * randomize_va_space to 2, which will still cause mm->start_brk
 	 * to be arbitrarily shifted
 	 */
-	if (current->brk_randomized)
-		min_brk = mm->start_brk;
-	else
+	if (!current->brk_randomized)
 		min_brk = mm->end_data;
-#else
-	min_brk = mm->start_brk;
 #endif
 	if (brk < min_brk)
 		goto out;
_

Patches currently in -mm which might be from liuqiye2025@163.com are

mm-fix-spelling-issue-in-swaph.patch
mm-remove-outdated-filename-comment-in-percpu-statsc.patch
mm-simplify-min_brk-handling-in-brk.patch