The patch titled
Subject: futex: fix shared futex operations on nommu
has been added to the -mm tree. Its filename is
futex-fix-shared-futex-operations-on-nommu.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/futex-fix-shared-futex-operations-on-nommu.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/futex-fix-shared-futex-operations-on-nommu.patch
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------------------------------------------------------
From: Rich Felker <dalias@xxxxxxxx>
Subject: futex: fix shared futex operations on nommu
The shared get_futex_key code does not work on nommu, but is not needed
anyway because it's impossible for a given backing to have multiple
distinct virtual addresses on nommu. Simply disable these code paths by
refraining from setting FLAG_SHARED when CONFIG_MMU is not enabled.
Signed-off-by: Rich Felker <dalias@xxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Darren Hart <dvhart@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/futex.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN kernel/futex.c~futex-fix-shared-futex-operations-on-nommu kernel/futex.c
--- a/kernel/futex.c~futex-fix-shared-futex-operations-on-nommu
+++ a/kernel/futex.c
@@ -3150,8 +3150,10 @@ long do_futex(u32 __user *uaddr, int op,
int cmd = op & FUTEX_CMD_MASK;
unsigned int flags = 0;
+#ifdef CONFIG_MMU
if (!(op & FUTEX_PRIVATE_FLAG))
flags |= FLAGS_SHARED;
+#endif
if (op & FUTEX_CLOCK_REALTIME) {
flags |= FLAGS_CLOCKRT;
_
Patches currently in -mm which might be from dalias@xxxxxxxx are
tmpfs-fix-vm_mayshare-mappings-for-nommu.patch
futex-fix-shared-futex-operations-on-nommu.patch
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