From: tip-bot for Thomas Gleixner <tglx@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com,
torvalds@linux-foundation.org, darren@dvhart.com,
tglx@linutronix.de, walken@google.com
Subject: [tip:core/futexes] arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic()
Date: Mon, 14 Mar 2011 20:16:11 GMT [thread overview]
Message-ID: <tip-07d5ecae2940ddd77746e2fb597dcf57d3c2e277@git.kernel.org> (raw)
In-Reply-To: <alpine.LFD.2.00.1103141126590.2787@localhost6.localdomain6>
Commit-ID: 07d5ecae2940ddd77746e2fb597dcf57d3c2e277
Gitweb: http://git.kernel.org/tip/07d5ecae2940ddd77746e2fb597dcf57d3c2e277
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 14 Mar 2011 20:00:30 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 14 Mar 2011 21:10:26 +0100
arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic()
commit 522d7dec(futex: Remove redundant pagefault_disable in
futex_atomic_cmpxchg_inatomic()) added a bogus comment.
/* Note that preemption is disabled by futex_atomic_cmpxchg_inatomic
* call sites. */
Bogus in two aspects:
1) pagefault_disable != preempt_disable even if the mechanism we use
is the same
2) we have a call site which deliberately does not disable pagefaults
as it wants the possible fault to be handled - though that has been
changed for consistency reasons now.
Sigh. I really should have seen that when committing the above. :(
Catched-by-and-rightfully-ranted-at-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <alpine.LFD.2.00.1103141126590.2787@localhost6.localdomain6>
Cc: Michel Lespinasse <walken@google.com>
Cc: Darren Hart <darren@dvhart.com>
---
arch/arm/include/asm/futex.h | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)
diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h
index 0e29d8e..199a6b6 100644
--- a/arch/arm/include/asm/futex.h
+++ b/arch/arm/include/asm/futex.h
@@ -97,9 +97,6 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
return -EFAULT;
- /* Note that preemption is disabled by futex_atomic_cmpxchg_inatomic
- * call sites. */
-
__asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
"1: " T(ldr) " %1, [%4]\n"
" teq %1, %2\n"
next prev parent reply other threads:[~2011-03-14 20:16 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-07 2:11 [PATCH] futex: cmpxchg_futex_value_locked API change Michel Lespinasse
2011-03-07 8:54 ` Martin Schwidefsky
2011-03-07 14:25 ` Chris Metcalf
2011-03-07 21:58 ` Luck, Tony
2011-03-08 20:17 ` Thomas Gleixner
2011-03-09 11:25 ` Michel Lespinasse
2011-03-09 15:04 ` Thomas Gleixner
2011-03-09 15:08 ` Martin Schwidefsky
2011-03-09 22:17 ` Michel Lespinasse
2011-03-09 17:50 ` Darren Hart
2011-03-10 18:55 ` Thomas Gleixner
2011-03-11 2:16 ` Michel Lespinasse
2011-03-11 2:47 ` [PATCH 1/3] futex: do not pagefault_disable in futex_atomic_cmpxchg_inatomic() Michel Lespinasse
2011-03-11 11:31 ` [tip:core/futexes] futex: Remove redundant " tip-bot for Michel Lespinasse
2011-03-13 22:49 ` [PATCH 1/3] futex: do not " Linus Torvalds
2011-03-14 0:55 ` Darren Hart
2011-03-14 1:15 ` Darren Hart
2011-03-14 9:13 ` Peter Zijlstra
2011-03-14 9:13 ` Thomas Gleixner
2011-03-14 13:56 ` Thomas Gleixner
2011-03-14 20:07 ` Darren Hart
2011-03-14 20:15 ` [tip:core/futexes] futex: Deobfuscate handle_futex_death() tip-bot for Thomas Gleixner
2011-03-14 20:16 ` tip-bot for Thomas Gleixner [this message]
2011-03-14 9:15 ` [PATCH 1/3] futex: do not pagefault_disable in futex_atomic_cmpxchg_inatomic() Michel Lespinasse
2011-03-11 2:48 ` [PATCH 2/3] futex: cmpxchg_futex_value_locked API change Michel Lespinasse
2011-03-11 11:31 ` [tip:core/futexes] futex: Sanitize cmpxchg_futex_value_locked API tip-bot for Michel Lespinasse
2012-03-05 0:01 ` [regression] Re: [PATCH 2/3] " Jonathan Nieder
2012-03-05 23:21 ` Luck, Tony
2012-03-05 23:42 ` Jonathan Nieder
2012-03-08 20:59 ` Émeric Maschino
2012-03-08 21:12 ` Émeric Maschino
2012-04-15 21:35 ` Émeric Maschino
2011-03-11 2:50 ` [PATCH 3/3] futex: fix futex operation types Michel Lespinasse
2011-03-11 11:32 ` [tip:core/futexes] futex: Sanitize futex ops argument types tip-bot for Michel Lespinasse
2011-03-09 11:08 ` [PATCH] futex: cmpxchg_futex_value_locked API change Michal Simek
2011-03-09 12:41 ` David Howells
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