linux-kernel - Re: [PATCH 9/24] make atomic_read() behave consistently on ia64

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Date:	Fri, 10 Aug 2007 23:42:59 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	"Chris Snook" <csnook@...hat.com>, <linux-kernel@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <torvalds@...ux-foundation.org>,
	<netdev@...r.kernel.org>, <akpm@...ux-foundation.org>,
	<ak@...e.de>, <heiko.carstens@...ibm.com>, <davem@...emloft.net>,
	<schwidefsky@...ibm.com>, <wensong@...ux-vs.org>,
	<horms@...ge.net.au>, <wjiang@...ilience.com>,
	<cfriesen@...tel.com>, <zlynx@....org>, <rpjday@...dspring.com>,
	<jesper.juhl@...il.com>
Subject: Re: [PATCH 9/24] make atomic_read() behave consistently on ia64

"Luck, Tony" <tony.luck@...el.com> writes:

>> That's distressing.  I'm about to resubmit with a volatile cast in 
>> atomic_set as well, since people expect that behavior and I've been 
>> shown a legitimate case where it could matter.  Does the assembly look 
>> right with that cast in atomic_set() as well?
>
> No.  With the casts to volatile in atomic_set and atomic64_set I
> still see places where ld8 is changed to ld4 + sign-extend.

Use atomic64_read to read an atomic64_t.

Signed-off-by: Andreas Schwab <schwab@...e.de>

diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h
index 1fc3b83..50c2b83 100644
--- a/include/asm-ia64/atomic.h
+++ b/include/asm-ia64/atomic.h
@@ -55,7 +55,7 @@ ia64_atomic64_add (__s64 i, atomic64_t *v)
 
 	do {
 		CMPXCHG_BUGCHECK(v);
-		old = atomic_read(v);
+		old = atomic64_read(v);
 		new = old + i;
 	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
 	return new;
@@ -83,7 +83,7 @@ ia64_atomic64_sub (__s64 i, atomic64_t *v)
 
 	do {
 		CMPXCHG_BUGCHECK(v);
-		old = atomic_read(v);
+		old = atomic64_read(v);
 		new = old - i;
 	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
 	return new;

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
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