linux-kernel - RE: [Patch 6/8] powerpc: implement crashkernel=auto

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Date:	Thu, 27 Aug 2009 11:22:21 -0700
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	'Amerigo Wang' <amwang@...hat.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
CC:	"Luck, Tony" <tony.luck@...el.com>,
	"'linux-ia64@...r.kernel.org'" <linux-ia64@...r.kernel.org>,
	'Neil Horman' <nhorman@...hat.com>,
	"'Eric W. Biederman'" <ebiederm@...ssion.com>,
	"'kamezawa.hiroyu@...fujitsu.com'" <kamezawa.hiroyu@...fujitsu.com>,
	'Andi Kleen' <andi@...stfloor.org>,
	'Michael Ellerman' <michael@...erman.id.au>,
	"'M. Mohan Kumar'" <mohan@...ibm.com>,
	"'akpm@...ux-foundation.org'" <akpm@...ux-foundation.org>,
	"'bernhard.walle@....de'" <bernhard.walle@....de>,
	'Ingo Molnar' <mingo@...e.hu>,
	'Anton Vorontsov' <avorontsov@...mvista.com>
Subject: RE: [Patch 6/8] powerpc: implement crashkernel=auto

>--- linux-2.6.orig/arch/powerpc/include/asm/kexec.h
>+++ linux-2.6/arch/powerpc/include/asm/kexec.h
>@@ -39,6 +39,45 @@ typedef void (*crash_shutdown_t)(void);
>
> #ifdef CONFIG_KEXEC
>
>+#ifdef CONFIG_KEXEC_AUTO_RESERVE
>+
>+#ifndef KEXEC_AUTO_THRESHOLD
>+#define KEXEC_AUTO_THRESHOLD (1ULL<<31) /* 2G */
>+#endif
>+
>+#ifndef arch_default_crash_base
>+static inline
>+unsigned long long arch_default_crash_base(void)
>+{
>+	return KDUMP_KERNELBASE;
>+}
You don't want inline here either.

>+#define arch_default_crash_base arch_default_crash_base
>+#endif
>+
>+#ifndef arch_default_crash_size
>+static inline
>+unsigned long long arch_default_crash_size(unsigned long long total_size)
>+{

Ditto.

>+	if (total_size < KEXEC_AUTO_THRESHOLD)
>+		return 0;
>+	if (total_size < (1ULL<<32))
>+		return 1ULL<<27;
>+	else {
>+#ifdef CONFIG_64BIT
>+		if (total_size > (1ULL<<37)) /* 128G */
>+			return 1ULL<<32; /* 4G */
>+		return 1ULL<<ilog2(roundup(total_size/32, 1ULL<<21));
>+#else
>+		return 1ULL<<28;
>+#endif
>+	}
>+}
>+#define arch_default_crash_size arch_default_crash_size
>+#endif
>+
>+#endif
>+#include <asm-generic/kexec.h>
>+
> /*
>  * This function is responsible for capturing register states if coming
>  * via panic or invoking dump using sysrq-trigger.
--
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