linux-kernel - Re: [PATCH]Fix parsing kernelcore boot option for ia64

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Message-Id: <20070423203837.23AD.Y-GOTO@jp.fujitsu.com>
Date:	Mon, 23 Apr 2007 20:46:15 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH]Fix parsing kernelcore boot option for ia64

> On Fri, 13 Apr 2007 14:26:22 +0900 Yasunori Goto <y-goto@...fujitsu.com> wrote:
> 
> > Hello.
> > 
> > cmdline_parse_kernelcore() should return the next pointer of boot option
> > like memparse() doing. If not, it is cause of eternal loop on ia64 box.
> > This patch is for 2.6.21-rc6-mm1.
> > 
> > Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com>
> > 
> > ----
> > 
> >  arch/ia64/kernel/efi.c |    2 +-
> >  include/linux/mm.h     |    2 +-
> >  mm/page_alloc.c        |    4 ++--
> >  3 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > Index: current_test/arch/ia64/kernel/efi.c
> > ===================================================================
> > --- current_test.orig/arch/ia64/kernel/efi.c	2007-04-12 17:33:28.000000000 +0900
> > +++ current_test/arch/ia64/kernel/efi.c	2007-04-13 12:13:21.000000000 +0900
> > @@ -424,7 +424,7 @@ efi_init (void)
> >  		} else if (memcmp(cp, "max_addr=", 9) == 0) {
> >  			max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
> >  		} else if (memcmp(cp, "kernelcore=",11) == 0) {
> > -			cmdline_parse_kernelcore(cp+11);
> > +			cmdline_parse_kernelcore(cp+11, &cp);
> >  		} else if (memcmp(cp, "min_addr=", 9) == 0) {
> >  			min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
> >  		} else {
> > Index: current_test/mm/page_alloc.c
> > ===================================================================
> > --- current_test.orig/mm/page_alloc.c	2007-04-12 18:25:37.000000000 +0900
> > +++ current_test/mm/page_alloc.c	2007-04-13 12:12:58.000000000 +0900
> > @@ -3736,13 +3736,13 @@ void __init free_area_init_nodes(unsigne
> >   * kernelcore=size sets the amount of memory for use for allocations that
> >   * cannot be reclaimed or migrated.
> >   */
> > -int __init cmdline_parse_kernelcore(char *p)
> > +int __init cmdline_parse_kernelcore(char *p, char **retp)
> >  {
> >  	unsigned long long coremem;
> >  	if (!p)
> >  		return -EINVAL;
> >  
> > -	coremem = memparse(p, &p);
> > +	coremem = memparse(p, retp);
> >  	required_kernelcore = coremem >> PAGE_SHIFT;
> >  
> >  	/* Paranoid check that UL is enough for required_kernelcore */
> > Index: current_test/include/linux/mm.h
> > ===================================================================
> > --- current_test.orig/include/linux/mm.h	2007-04-11 14:15:33.000000000 +0900
> > +++ current_test/include/linux/mm.h	2007-04-13 12:12:20.000000000 +0900
> > @@ -1051,7 +1051,7 @@ extern unsigned long find_max_pfn_with_a
> >  extern void free_bootmem_with_active_regions(int nid,
> >  						unsigned long max_low_pfn);
> >  extern void sparse_memory_present_with_active_regions(int nid);
> > -extern int cmdline_parse_kernelcore(char *p);
> > +extern int cmdline_parse_kernelcore(char *p, char **retp);
> >  #ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
> >  extern int early_pfn_to_nid(unsigned long pfn);
> >  #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
> > 
> 
> This will cause all other architectures to crash when kernelcore= is used.
> 
> I wasn't even aware of this kernelcore thing.  It's pretty nasty-looking. 
> yet another reminder that this code hasn't been properly reviewed in the
> past year or three.

Just now, I'm making memory-unplug patches with current MOVABLE_ZONE
code. So, I might be the first user of it on ia64.

Anyway, I'll try to fix it.


-- 
Yasunori Goto 


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