linux-kernel - RE: [Patch 4/8] ia64: implement crashkernel=auto

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Date:	Wed, 26 Aug 2009 21:19:18 -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:	'Anton Vorontsov' <avorontsov@...mvista.com>,
	"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>
Subject: RE: [Patch 4/8] ia64: implement crashkernel=auto

>
>Since in patch 2/8 we already implement the generic part, this will
>add the rest part for ia64.
>
>Signed-off-by: WANG Cong <amwang@...hat.com>
>Cc: Fenghua Yu <fenghua.yu@...el.com>
>Cc: Tony Luck <tony.luck@...el.com>
>
>---
>
>Index: linux-2.6/arch/ia64/include/asm/kexec.h
>===================================================================
>--- linux-2.6.orig/arch/ia64/include/asm/kexec.h
>+++ linux-2.6/arch/ia64/include/asm/kexec.h
>@@ -1,6 +1,7 @@
> #ifndef _ASM_IA64_KEXEC_H
> #define _ASM_IA64_KEXEC_H
>
>+#include <asm-generic/kexec.h>
>
> /* Maximum physical address we can use pages from */
> #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
>@@ -19,6 +20,49 @@
>                 flush_icache_range(page_addr, page_addr + PAGE_SIZE); \
>         } while(0)
>
>+#ifdef CONFIG_KEXEC_AUTO_RESERVE
>+#define MBYTES(n) ((n)*1024*1024ULL)
>+#define GBYTES(n) ((n)*1024*1024*1024ULL)
>+/*
>+       Memory size     Reserved memory
>+       ===========     ===============
>+       [4G, 12G)       256M
>+       [12G, 128G)     512M
>+       [128G, 256G)    768M
>+       [256G, 378G)    1024M
>+       [378G, 512G)    1536M
>+       [512G, 768G)    2048M
>+       [768G, )        3072M
>+ */
>+static inline
>+unsigned long long arch_default_crash_size(unsigned long long total_size)
>+{

This function shouldn't be inlined (Andrew commented this before). You might remove inline and add __init for this function. 

>+	unsigned long long ret;
>+
>+	if (total_size >= GBYTES(4) && total_size < GBYTES(12))
>+		ret = MBYTES(256);
>+	else if (total_size >= GBYTES(12) && total_size < GBYTES(128))
>+		ret = MBYTES(512);
>+	else if (total_size >= GBYTES(128) && total_size < GBYTES(256))
>+		ret = MBYTES(768);
>+	else if (total_size >= GBYTES(256) && total_size < GBYTES(378))
>+		ret = MBYTES(1024);
>+	else if (total_size >= GBYTES(318) && total_size < GBYTES(512))
>+		ret = MBYTES(1536);
>+	else if (total_size >= GBYTES(512) && total_size < GBYTES(768))
>+		ret = MBYTES(2048);
>+	else
>+		ret = MBYTES(3072);
>+	if (!ia64_platform_is("sn2") && !ia64_platform_is("uv"))
>+		if (ret > GBYTES(4))
>+			ret = ret / GBYTES(4) * MBYTES(256);

This code doesn't make sense to me. What you really want is following code, right?
+		if (total_size > GBYTES(4))
+			ret = total_size / GBYTES(4) * MBYTEST(256)

>+	return ret;
>+}
>+#undef GBYTES
>+#undef MBYTES
>+#define arch_default_crash_size arch_default_crash_size
>+#endif
>+
> extern struct kimage *ia64_kimage;
> extern const unsigned int relocate_new_kernel_size;
> extern void relocate_new_kernel(unsigned long, unsigned long,
--
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