linux-kernel - Re: [patch 1/3] kdump: use is_kdump_kernel() in sba

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Message-ID: <20080729231507.GF6370@verge.net.au>
Date:	Wed, 30 Jul 2008 09:15:10 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	kexec@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [patch 1/3] kdump: use is_kdump_kernel() in sba_init()

After recent patches* is_kdump_kernel() should return 1 in the
case where code is executing in a crashkernel and 0 otherwise.
It is safe to use outside of CONFIG_CRASH_DUMP.

* http://lkml.org/lkml/2008/7/28/445

Signed-off-by: Simon Horman <horms@...ge.net.au>
Acked-by: Vivek Goyal <vgoyal@...hat.com>

Index: linux-2.6/arch/ia64/hp/common/sba_iommu.c
===================================================================
--- linux-2.6.orig/arch/ia64/hp/common/sba_iommu.c	2008-07-29 10:57:17.000000000 +1000
+++ linux-2.6/arch/ia64/hp/common/sba_iommu.c	2008-07-29 10:57:51.000000000 +1000
@@ -2070,14 +2070,13 @@ sba_init(void)
 	if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
 		return 0;
 
-#if defined(CONFIG_IA64_GENERIC) && defined(CONFIG_CRASH_DUMP) && \
-        defined(CONFIG_PROC_FS)
+#if defined(CONFIG_IA64_GENERIC)
 	/* If we are booting a kdump kernel, the sba_iommu will
 	 * cause devices that were not shutdown properly to MCA
 	 * as soon as they are turned back on.  Our only option for
 	 * a successful kdump kernel boot is to use the swiotlb.
 	 */
-	if (elfcorehdr_addr < ELFCORE_ADDR_MAX) {
+	if (is_kdump_kernel()) {
 		if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
 			panic("Unable to initialize software I/O TLB:"
 				  " Try machvec=dig boot option");
--
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