[PATCH] Revert "kexec: use mmap instead of read for slurp_file()"

[Simon Horman]

On Fri, Oct 23, 2015 at 11:10:00AM +0800, Dave Young wrote:
> This reverts commit 7ab842d8a004f6cd75a9d7b3528e4a70819ce4ef.
> 
> using mmap by default in slurp_file cause segment fault while later
> reallocing dtb_buf during my arm kexec test.
> 
> Signed-off-by: Dave Young <dyoung at redhat.com>

Thanks, applied.

> ---
>  kexec/kexec.c |    8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> --- kexec-tools.orig/kexec/kexec.c
> +++ kexec-tools/kexec/kexec.c
> @@ -26,7 +26,6 @@
>  #include <stdlib.h>
>  #include <errno.h>
>  #include <limits.h>
> -#include <sys/mman.h>
>  #include <sys/types.h>
>  #include <sys/stat.h>
>  #include <sys/reboot.h>
> @@ -553,12 +552,11 @@ char *slurp_file(const char *filename, o
>  		if (err < 0)
>  			die("Can not seek to the begin of file %s: %s\n",
>  					filename, strerror(errno));
> -		buf = slurp_fd(fd, filename, size, &nread);
>  	} else {
> -		size = nread = stats.st_size;
> -		buf = mmap(NULL, size,
> -			   PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
> +		size = stats.st_size;
>  	}
> +
> +	buf = slurp_fd(fd, filename, size, &nread);
>  	if (!buf)
>  		die("Cannot read %s", filename);
>  
>