linux-kernel - Re: [thisops uV3 14/18] lguest: Use this_cpu

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Message-Id: <201012061816.07860.rusty@rustcorp.com.au>
Date:	Mon, 6 Dec 2010 18:16:07 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christoph Lameter <cl@...ux.com>
Cc:	akpm@...ux-foundation.org, Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org
Subject: Re: [thisops uV3 14/18] lguest: Use this_cpu_ops

On Wed, 1 Dec 2010 05:37:21 am Christoph Lameter wrote:
> Use this_cpu_ops in a couple of places in lguest.
> 
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Signed-off-by: Christoph Lameter <cl@...ux.com>

This doesn't even compile :(

I've applied it, and applied the following fixes, too:

lguest: compile fixes

arch/x86/lguest/boot.c: In function ‘lguest_init_IRQ’:
arch/x86/lguest/boot.c:824: error: macro "__this_cpu_write" requires 2 arguments, but only 1 given
arch/x86/lguest/boot.c:824: error: ‘__this_cpu_write’ undeclared (first use in this function)
arch/x86/lguest/boot.c:824: error: (Each undeclared identifier is reported only once
arch/x86/lguest/boot.c:824: error: for each function it appears in.)

drivers/lguest/x86/core.c: In function ‘copy_in_guest_info’:
drivers/lguest/x86/core.c:94: error: lvalue required as left operand of assignment

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -821,7 +821,7 @@ static void __init lguest_init_IRQ(void)
 
 	for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
 		/* Some systems map "vectors" to interrupts weirdly.  Not us! */
-		__this_cpu_write(vector_irq[i]) = i - FIRST_EXTERNAL_VECTOR;
+		__this_cpu_write(vector_irq[i], i - FIRST_EXTERNAL_VECTOR);
 		if (i != SYSCALL_VECTOR)
 			set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
 	}
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -91,7 +91,7 @@ static void copy_in_guest_info(struct lg
 	 * Guest has changed.
 	 */
 	if (__this_cpu_read(lg_last_cpu) != cpu || cpu->last_pages != pages) {
-		__this_cpu_read(lg_last_cpu) = cpu;
+		__this_cpu_write(lg_last_cpu, cpu);
 		cpu->last_pages = pages;
 		cpu->changed = CHANGED_ALL;
 	}
--
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