[tip:x86/boot] x86, boot: Document intermediates more clearly

[tip-bot for Kees Cook]

Commit-ID:  fb7183ef3c016d9067ff83f3ff2455be1818f902
Gitweb:     http://git.kernel.org/tip/fb7183ef3c016d9067ff83f3ff2455be1818f902
Author:     Kees Cook <keescook@xxxxxxxxxxxx>
AuthorDate: Fri, 31 Oct 2014 09:22:04 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sat, 1 Nov 2014 22:46:02 +0100

x86, boot: Document intermediates more clearly

This adds a comment detailing the various intermediate files used to build
the bootable decompression image for the x86 kernel.

Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Junjie Mao <eternal.n08@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20141031162204.GA26268@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 arch/x86/boot/compressed/Makefile | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index 704f58a..8a39181 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -3,6 +3,18 @@
 #
 # create a compressed vmlinux image from the original vmlinux
 #
+# vmlinuz is:
+#	decompression code (*.o)
+#	asm globals (piggy.S), including:
+#		vmlinux.bin.(gz|bz2|lzma|...)
+#
+# vmlinux.bin is:
+#	vmlinux stripped of debugging and comments
+# vmlinux.bin.all is:
+#	vmlinux.bin + vmlinux.relocs
+# vmlinux.bin.(gz|bz2|lzma|...) is:
+#	(see scripts/Makefile.lib size_append)
+#	compressed vmlinux.bin.all + u32 size of vmlinux.bin.all
 
 targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
 	vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4
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