linux-kernel - [Patch 6/7] powerpc: implement crashkernel=auto

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Date:	Wed, 5 Aug 2009 07:20:00 -0400
From:	Amerigo Wang <amwang@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	Neil Horman <nhorman@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Amerigo Wang <amwang@...hat.com>, akpm@...ux-foundation.org,
	Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: [Patch 6/7] powerpc: implement crashkernel=auto


Since in patch 2/7 we already implement the generic part, this will
add the rest part for powerpc.

Signed-off-by: WANG Cong <amwang@...hat.com>

---
Index: linux-2.6/arch/powerpc/include/asm/kexec.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/kexec.h
+++ linux-2.6/arch/powerpc/include/asm/kexec.h
@@ -39,6 +39,29 @@ typedef void (*crash_shutdown_t)(void);
 
 #ifdef CONFIG_KEXEC
 
+#ifdef CONFIG_KEXEC_AUTO_RESERVE
+#ifndef KEXEC_AUTO_RESERVED_SIZE
+#define KEXEC_AUTO_RESERVED_SIZE 1ULL<<28 /* 256M */
+#endif
+#ifndef KEXEC_AUTO_THRESHOLD
+#define KEXEC_AUTO_THRESHOLD 1ULL<<32 /* 4G */
+#endif
+static inline
+unsigned long long arch_default_crash_size(unsigned long long total_size)
+{
+	if (total_size < KEXEC_AUTO_THRESHOLD)
+		return 0;
+	else
+		return KEXEC_AUTO_RESERVED_SIZE;
+}
+static inline
+unsigned long long arch_default_crash_base(void)
+{
+	/* On ppc, 0 means find the base address automatically. */
+	return 0;
+}
+#endif
+
 /*
  * This function is responsible for capturing register states if coming
  * via panic or invoking dump using sysrq-trigger.
--
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