linux-kernel - RE: [PATCH] ia64: fix build failure on fs/quota.c

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Date:	Thu, 26 Jul 2007 14:24:19 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Doug Chapman" <doug.chapman@...com>,
	<linux-kernel@...r.kernel.org>
Cc:	<linux-ia64@...r.kernel.org>, <vtaras@...nvz.org>,
	"H. Peter Anvin" <hpa@...or.com>, "Andi Kleen" <ak@...e.de>
Subject: RE: [PATCH] ia64: fix build failure on fs/quota.c

This issue wandered off onto a long thread "build fix for x86_64" which
died out without a final patch.  Here's the summary:

> +#if defined(CONFIG_X86_64) || (defined(CONFIG_IA64) && defined(CONFIG_COMPAT))

It was pointed out that x86-64 also has a CONFIG_COMPAT, so the "right"
#ifdef mess would be:

#if defined(CONFIG_COMPAT) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))

But this was thought too ugly.  Andi Kleen proposed making a new CONFIG
variable for this situation: CONFIG_COMPAT_FOR_U64_ALIGMNENT which could
be set in ia64 and x86-64 Kconfig files with:

config COMPAT_FOR_U64_ALIGMNENT
	def_bool COMPAT

So the C-code would simply have:

#if defined(COMPAT_COMPAT_FOR_U64_ALIGMNENT)

(IIRC the syntax correctly).  Peter Anvin had some worries about future
issues ... but I think he agreed that this was Ok.

Anyone still have any objections to this?

Signed-off-by: Tony Luck <tony.luck@...el.com>

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 36c7b96..21aa4fc 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -425,6 +425,9 @@ config COMPAT
 	depends on IA32_SUPPORT
 	default y
 
+config COMPAT_FOR_U64_ALIGNMENT
+	def_bool COMPAT
+
 config IA64_MCA_RECOVERY
 	tristate "MCA recovery from errors other than TLB."
 
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 45f82ae..ffa0364 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -765,6 +765,9 @@ config COMPAT
 	depends on IA32_EMULATION
 	default y
 
+config COMPAT_FOR_U64_ALIGNMENT
+	def_bool COMPAT
+
 config SYSVIPC_COMPAT
 	bool
 	depends on COMPAT && SYSVIPC
diff --git a/fs/quota.c b/fs/quota.c
index e6577ac..99b24b5 100644
--- a/fs/quota.c
+++ b/fs/quota.c
@@ -387,7 +387,7 @@ asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special, qid_t
 	return ret;
 }
 
-#if defined(CONFIG_X86_64) || defined(CONFIG_IA64)
+#if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT)
 /*
  * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64)
  * and is necessary due to alignment problems.
-
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