linux-kernel - [PATCH] PPC: define the conditions where the ePAPR idle hcall can be supported

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Date:	Fri, 22 Mar 2013 14:12:13 -0500
From:	Stuart Yoder <stuart.yoder@...escale.com>
To:	<mikey@...ling.org>
CC:	<chen.gang.flying.transformer@...il.com>,
	<galak@...nel.crashing.org>, <gang.chen@...anux.com>,
	<benh@...nel.crashing.org>, <sfr@...b.auug.org.au>,
	<paulus@...ba.org>, <matt@...abs.org>, <imunsie@....ibm.com>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	Stuart Yoder <stuart.yoder@...escale.com>
Subject: [PATCH] PPC: define the conditions where the ePAPR idle hcall can be supported

From: Stuart Yoder <stuart.yoder@...escale.com>

For 32-bit, CONFIG_EPAPR_PARAVIRT pulls in both epapr_paravirt.c
and epapr_hcalls.c which contains the 32-bit paravirt idle loop.

For 64-bit, the paravirt idle loop is in idle_book3e.S and that
source file is included only if CONFIG_PPC_BOOK3E_64 defined.

This patch makes that dependency for 64-bit explicit.

Signed-off-by: Stuart Yoder <stuart.yoder@...escale.com>
---
 arch/powerpc/kernel/epapr_paravirt.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c
index f3eab85..d44a571 100644
--- a/arch/powerpc/kernel/epapr_paravirt.c
+++ b/arch/powerpc/kernel/epapr_paravirt.c
@@ -23,8 +23,10 @@
 #include <asm/code-patching.h>
 #include <asm/machdep.h>
 
+#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
 extern void epapr_ev_idle(void);
 extern u32 epapr_ev_idle_start[];
+#endif
 
 bool epapr_paravirt_enabled;
 
@@ -47,11 +49,15 @@ static int __init epapr_paravirt_init(void)
 
 	for (i = 0; i < (len / 4); i++) {
 		patch_instruction(epapr_hypercall_start + i, insts[i]);
+#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
 		patch_instruction(epapr_ev_idle_start + i, insts[i]);
+#endif
 	}
 
+#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
 	if (of_get_property(hyper_node, "has-idle", NULL))
 		ppc_md.power_save = epapr_ev_idle;
+#endif
 
 	epapr_paravirt_enabled = true;
 
-- 
1.7.9.7


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