From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 12 Jan 2011 08:55:25 +0000 (+0100)
Subject: [S390] Enable flexible mmap layout for 64 bit processes
X-Git-Tag: firefly_0821_release~7613^2~2708^2~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7e0d48574ec371e26fa31e23d1d314f04e31eb3e;p=firefly-linux-kernel-4.4.55.git

[S390] Enable flexible mmap layout for 64 bit processes

Historically 64 bit processes use the legacy address layout. However
there is no reason why 64 bit processes shouldn't benefit from the
flexible mmap layout advantages.
Therefore just enable it.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 89eff9e7b0b5..ab7e08a01b6c 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -61,16 +61,11 @@ static inline unsigned long mmap_base(void)
 
 static inline int mmap_is_legacy(void)
 {
-#ifdef CONFIG_64BIT
-	/*
-	 * Force standard allocation for 64 bit programs.
-	 */
-	if (!is_compat_task())
+	if (current->personality & ADDR_COMPAT_LAYOUT)
 		return 1;
-#endif
-	return sysctl_legacy_va_layout ||
-	    (current->personality & ADDR_COMPAT_LAYOUT) ||
-	    rlimit(RLIMIT_STACK) == RLIM_INFINITY;
+	if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+		return 1;
+	return sysctl_legacy_va_layout;
 }
 
 #ifndef CONFIG_64BIT