[PATCH] mm: simplify min_brk handling in brk()

[Xuanye Liu <liuqiye2025@163.com>]

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.

Signed-off-by: Xuanye Liu <liuqiye2025@163.com>
---
 mm/mmap.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index d8fa373e4ac1..7306253cc3b5 100644
--- a/mm/mmap.c
+++ b/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;
-- 
2.43.0