linux-kernel - [tip:core/futexes] arm: Remove bogus comment in futex_atomic_cmpxchg

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Date:	Mon, 14 Mar 2011 20:16:11 GMT
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	torvalds@...ux-foundation.org, darren@...art.com,
	tglx@...utronix.de, walken@...gle.com
Subject: [tip:core/futexes] arm: Remove bogus comment in futex_atomic_cmpxchg_inatomic()

Commit-ID:  07d5ecae2940ddd77746e2fb597dcf57d3c2e277
Gitweb:     http://git.kernel.org/tip/07d5ecae2940ddd77746e2fb597dcf57d3c2e277
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 14 Mar 2011 20:00:30 +0100
Committer:  Thomas Gleixner <tglx@...utronix.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@...ux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
LKML-Reference: <alpine.LFD.2.00.1103141126590.2787@...alhost6.localdomain6>
Cc: Michel Lespinasse <walken@...gle.com>
Cc: Darren Hart <darren@...art.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"
--
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