From: Oleg Nesterov <oleg@redhat.com>
To: Alex Thorlton <athorlton@sgi.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Rik van Riel <riel@redhat.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Andy Lutomirski <luto@amacapital.net>,
Al Viro <viro@zeniv.linux.org.uk>,
Kees Cook <keescook@chromium.org>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: [PATCH 2/2] mm: thp: kill the bogus ->def_flags check in hugepage_madvise()
Date: Wed, 22 Jan 2014 18:46:46 +0100 [thread overview]
Message-ID: <20140122174646.GC29710@redhat.com> (raw)
In-Reply-To: <20140122174553.GA29710@redhat.com>
hugepage_madvise() checks "mm->def_flags & VM_NOHUGEPAGE" but
this can be never true, currently mm->def_flags can only have
VM_LOCKED.
And otoh we might want to add VM_NOHUGEPAGE into ->def_flags
but override it in vma->vm_flags via madvise(MADV_HUGEPAGE).
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
mm/huge_memory.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index bccd5a6..e8b656c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1941,8 +1941,6 @@ int hugepage_madvise(struct vm_area_struct *vma,
*/
if (*vm_flags & (VM_HUGEPAGE | VM_NO_THP))
return -EINVAL;
- if (mm->def_flags & VM_NOHUGEPAGE)
- return -EINVAL;
*vm_flags &= ~VM_NOHUGEPAGE;
*vm_flags |= VM_HUGEPAGE;
/*
--
1.5.5.1
next prev parent reply other threads:[~2014-01-22 17:48 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-16 21:01 [RFC PATCHv2 1/2] Add mm flag to control THP Alex Thorlton
2014-01-16 21:01 ` [RFC PATCHv2 2/2] Change khugepaged to respect MMF_THP_DISABLE flag Alex Thorlton
2014-01-17 20:34 ` Oleg Nesterov
2014-01-17 22:58 ` Alex Thorlton
2014-01-18 23:49 ` Kirill A. Shutemov
2014-01-20 19:58 ` Alex Thorlton
2014-01-20 20:15 ` Oleg Nesterov
2014-01-20 20:41 ` Alex Thorlton
2014-01-22 17:45 ` [PATCH 0/2] mm->def_flags cleanups (Was: Change khugepaged to respect MMF_THP_DISABLE flag) Oleg Nesterov
2014-01-22 17:46 ` [PATCH 1/2] exec: kill the unnecessary mm->def_flags setting in load_elf_binary() Oleg Nesterov
2014-01-22 17:46 ` Oleg Nesterov [this message]
2014-01-22 20:16 ` [PATCH 2/2] mm: thp: kill the bogus ->def_flags check in hugepage_madvise() Hugh Dickins
2014-01-23 16:43 ` Oleg Nesterov
2014-01-24 14:19 ` Gerald Schaefer
2014-01-22 18:11 ` [PATCH 0/2] mm->def_flags cleanups (Was: Change khugepaged to respect MMF_THP_DISABLE flag) Oleg Nesterov
2014-01-22 18:40 ` Alex Thorlton
2014-01-22 19:25 ` Oleg Nesterov
2014-01-22 19:43 ` Oleg Nesterov
2014-01-22 20:02 ` Alex Thorlton
2014-01-23 16:47 ` Oleg Nesterov
2014-01-17 19:54 ` [RFC PATCHv2 1/2] Add mm flag to control THP Andy Lutomirski
2014-01-17 22:54 ` Alex Thorlton
2014-01-17 20:09 ` Oleg Nesterov
2014-01-17 22:52 ` Alex Thorlton
2014-01-18 23:41 ` Kirill A. Shutemov
2014-01-20 17:26 ` Alex Thorlton
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