From: Sven Schnelle <svens@linux.ibm.com>
Date: Wed, 6 Apr 2022 06:01:24 +0000 (+0200)
Subject: s390/mmap: increase stack/mmap gap to 128MB
X-Git-Tag: v6.1-rc5~1155^2~56
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f2f47d0ef72c30622e62471903ea19446ea79ee2;p=platform%2Fkernel%2Flinux-starfive.git

s390/mmap: increase stack/mmap gap to 128MB

This basically reverts commit 9e78a13bfb16 ("[S390] reduce miminum
gap between stack and mmap_base"). 32MB is not enough space
between stack and mmap for some programs. Given that compat
task aren't common these days, lets revert back to 128MB.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index e54f928503c5..d545f5c39f7e 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -58,9 +58,9 @@ static inline unsigned long mmap_base(unsigned long rnd,
 
 	/*
 	 * Top of mmap area (just below the process stack).
-	 * Leave at least a ~32 MB hole.
+	 * Leave at least a ~128 MB hole.
 	 */
-	gap_min = 32 * 1024 * 1024UL;
+	gap_min = SZ_128M;
 	gap_max = (STACK_TOP / 6) * 5;
 
 	if (gap < gap_min)