linux-kernel - [PATCH followup] mm: get rid of CONFIG_STACK_GROWSUP || CONFIG

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Message-ID: <20110419110956.GD21689@tiehlicka.suse.cz>
Date:	Tue, 19 Apr 2011 13:09:56 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH followup] mm: get rid of CONFIG_STACK_GROWSUP || CONFIG_IA64

While I am in the cleanup mode. We should use VM_GROWSUP rather than
tricky CONFIG_STACK_GROWSUP||CONFIG_IA64.

What do you think?
--- 
>From fd832dd46b4918718901f2ebe994f4662f167999 Mon Sep 17 00:00:00 2001
From: Michal Hocko <mhocko@...e.cz>
Date: Tue, 19 Apr 2011 11:11:41 +0200
Subject: [PATCH] mm: get rid of CONFIG_STACK_GROWSUP || CONFIG_IA64

IA64 needs some trickery for Register Backing Store so we have to
export expand_stack_upwards for it even though the architecture expands
its stack downwards normally. To avoid
we have defined VM_GROWSUP which is defined only for the above
configuration.

We still have places which use the original ifdefs so let's get rid of
them finally.

Signed-off-by: Michal Hocko <mhocko@...e.cz>
---
 mm/mmap.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 29c68b0..3ff9edf 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1726,7 +1726,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
 	return 0;
 }
 
-#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64)
+#if VM_GROWSUP
 /*
  * PA-RISC uses this for its stack; IA64 for its Register Backing Store.
  * vma is the last one with address > vma->vm_end.  Have to extend vma.
@@ -1777,7 +1777,7 @@ int expand_stack_upwards(struct vm_area_struct *vma, unsigned long address)
 	khugepaged_enter_vma_merge(vma);
 	return error;
 }
-#endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */
+#endif /* VM_GROWSUP */
 
 /*
  * vma is the first one with address < vma->vm_start.  Have to extend vma.
-- 
1.7.4.1

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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