On Thu, Jun 05, 2014 at 10:05:23PM +0200, Borislav Petkov wrote: [..] > > @@ -249,6 +254,7 @@ archclean: > > $(Q)rm -rf $(objtree)/arch/x86_64 > > $(Q)$(MAKE) $(clean)=$(boot) > > $(Q)$(MAKE) $(clean)=arch/x86/tools > > ifeq ($(CONFIG_KEXEC),y) > $(Q)$(MAKE) $(clean)=arch/x86/purgatory > endif Hmm.., is it strictly required? I am wondering what happens if I build a kernel with CONFIG_KEXEC=y, then set CONFIG_KEXEC=n and do "make clean". I think I will still like any files in arch/x86/purgatory to be cleaned despite the fact that CONFIG_KEXEC=n. Isn't it? [..] > > +ifeq ($(CONFIG_X86_64),y) > > +KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes -fno-zero-initialized-in-bss -mcmodel=large -Os -fno-builtin -ffreestanding -c -MD > > +else > > +KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes -fno-zero-initialized-in-bss -Os -fno-builtin -ffreestanding -c -MD -m32 > > +endif > > Those variable assignments have a lot of duplication, let's simplify > (diff ontop): Thanks. This looks cleaner and also highlights the difference between x86_64 and x86. Will change. [..] > > + .section ".rodata" > > + .balign 4 > > +entry64_regs: > > +rax: .quad 0x00000000 > > Simply 0x0? Or am I missing something? I think .quad 0x0 should work. Will use it. [..] > > + sha256_final(&sctx, digest); > > + > > + if (memcmp(digest, sha256_digest, sizeof(digest)) != 0) > > if (memcmp(...)) > return 1; > > should be a bit cleaner. > Ok. Will do. [..] > > +void purgatory(void) > > +{ > > + int ret; > > + > > + ret = verify_sha256_digest(); > > + if (ret) { > > + /* loop forever */ > > + for (;;); > > checkpatch bitches about this: > > ERROR: trailing statements should be on next line > #303: FILE: arch/x86/purgatory/purgatory.c:68: > + for (;;); Ok, will move semicolon to next line. Thanks Vivek