[PATCH v2] kexec-tools: Don't duplicate the bzImage header area

[Simon Horman]

On Wed, Feb 09, 2011 at 01:13:04PM +0200, Ahmed S. Darwish wrote:
> On Wed, Feb 09, 2011 at 07:15:45AM +0900, Simon Horman wrote:
> > On Tue, Feb 08, 2011 at 05:20:36PM +0200, Ahmed S. Darwish wrote:
> > > 
> > > diff --git a/kexec/arch/i386/kexec-bzImage.c b/kexec/arch/i386/kexec-bzImage.c
> > > index 83d3a69..2312eb8 100644
> > > --- a/kexec/arch/i386/kexec-bzImage.c
> > > +++ b/kexec/arch/i386/kexec-bzImage.c
> > > @@ -43,32 +43,32 @@ static const int probe_debug = 0;
> > >  
> > >  int bzImage_probe(const char *buf, off_t len)
> > >  {
> > > -	struct x86_linux_header header;
> > > +	const struct x86_linux_header *header;
> > >  	if ((uintmax_t)len < (uintmax_t)sizeof(header)) {
> > >  		return -1;
> > >  	}
> > > -	memcpy(&header, buf, sizeof(header));
> > > -	if (memcmp(header.header_magic, "HdrS", 4) != 0) {
> > > +	header = (void *)buf;
> > 
> > Perhaps casting to (struct x86_linux_header*) would read better?
> > 
> 
> I felt that '(const struct x86_linux_header *)' is a bit long, but it's
> not a big deal. Attached is the same patch with that line modified:
> 
> ==>
> 
> Don't wholeheartedly copy the 32-Kbytes bzImage header area to the stack,
> just use a constant pointer instead.

Thanks, applied.