arch/x86/purgatory/Makefile: try to use automatic variable in kexec purgatory makefile

Make the Makefile of kexec purgatory be consistent with others in linux
src tree, and make it look generic and simple.

Signed-off-by: Baoquan He <[email protected]>
Cc: Vivek Goyal <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 899dd24542568de85e815e4b9f206d66286bca8c..f52e033557c9e0b54c41248101e0d7d7ed7cb76f 100644 (file)
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -18,8 +18,9 @@ $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 
 targets += kexec-purgatory.c
 
+CMD_BIN2C = $(objtree)/scripts/basic/bin2c
 quiet_cmd_bin2c = BIN2C   $@
-      cmd_bin2c = cat $(obj)/purgatory.ro | $(objtree)/scripts/basic/bin2c kexec_purgatory > $(obj)/kexec-purgatory.c
+      cmd_bin2c = $(CMD_BIN2C) kexec_purgatory < $< > $@
 
 $(obj)/kexec-purgatory.c: $(obj)/purgatory.ro FORCE
        $(call if_changed,bin2c)