x86, build: Do not set the root_dev field in bzImage

This has been obsoleted by the root= commandline and the rdev utility
for many, many years.  People who still depend on this will surely
have a copy of the rdev utility around, the rest of the world gets rid
of another piece of buildhost-dependent data in the build. Thanks to
Paul Bolle for the build.c cleanup.

Cc: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Link: http://lkml.kernel.org/r/1302607824-24699-1-git-send-email-mmarek@suse.cz
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2 files changed, 5 insertions, 37 deletions

diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index f7cb086b4add..95365a82b6a0 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -9,12 +9,6 @@
 # Changed by many, many contributors over the years.
 #
 
-# ROOT_DEV specifies the default root-device when making the image.
-# This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
-# the default of FLOPPY is used by 'build'.
-
-ROOT_DEV        := CURRENT
-
 # If you want to preset the SVGA mode, uncomment the next line and
 # set SVGA_MODE to whatever number you want.
 # Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
@@ -75,8 +69,7 @@ GCOV_PROFILE := n
 $(obj)/bzImage: asflags-y  := $(SVGA_MODE)
 
 quiet_cmd_image = BUILD   $@
-cmd_image = $(obj)/tools/build $(obj)/setup.bin $(obj)/vmlinux.bin \
-        $(ROOT_DEV) > $@
+cmd_image = $(obj)/tools/build $(obj)/setup.bin $(obj)/vmlinux.bin > $@
 
 $(obj)/bzImage: $(obj)/setup.bin $(obj)/vmlinux.bin $(obj)/tools/build FORCE
         $(call if_changed,image)
diff --git a/arch/x86/boot/tools/build.c b/arch/x86/boot/tools/build.c
index ee3a4ea923ac..fdc60a0b3c20 100644
--- a/arch/x86/boot/tools/build.c
+++ b/arch/x86/boot/tools/build.c
@@ -130,7 +130,7 @@ static void die(const char * str, ...)
 
 static void usage(void)
 {
-        die("Usage: build setup system [rootdev] [> image]");
+        die("Usage: build setup system [> image]");
 }
 
 int main(int argc, char ** argv)
@@ -138,39 +138,14 @@ int main(int argc, char ** argv)
         unsigned int i, sz, setup_sectors;
         int c;
         u32 sys_size;
-        u8 major_root, minor_root;
         struct stat sb;
         FILE *file;
         int fd;
         void *kernel;
         u32 crc = 0xffffffffUL;
 
-        if ((argc < 3) || (argc > 4))
+        if (argc != 3)
                 usage();
-        if (argc > 3) {
-                if (!strcmp(argv[3], "CURRENT")) {
-                        if (stat("/", &sb)) {
-                                perror("/");
-                                die("Couldn't stat /");
-                        }
-                        major_root = major(sb.st_dev);
-                        minor_root = minor(sb.st_dev);
-                } else if (strcmp(argv[3], "FLOPPY")) {
-                        if (stat(argv[3], &sb)) {
-                                perror(argv[3]);
-                                die("Couldn't stat root device.");
-                        }
-                        major_root = major(sb.st_rdev);
-                        minor_root = minor(sb.st_rdev);
-                } else {
-                        major_root = 0;
-                        minor_root = 0;
-                }
-        } else {
-                major_root = DEFAULT_MAJOR_ROOT;
-                minor_root = DEFAULT_MINOR_ROOT;
-        }
-        fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
 
         /* Copy the setup code */
         file = fopen(argv[1], "r");
@@ -193,8 +168,8 @@ int main(int argc, char ** argv)
         memset(buf+c, 0, i-c);
 
         /* Set the default root device */
-        buf[508] = minor_root;
-        buf[509] = major_root;
+        buf[508] = DEFAULT_MINOR_ROOT;
+        buf[509] = DEFAULT_MAJOR_ROOT;
 
         fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i);