From: Masahiro Yamada masahiroy@kernel.org
commit 7ad4bd887d27c6b6ffbef216f19c19f8fe2b8f52 upstream.
You cannot include <generated/compile.h> here because it is generated in init/Makefile but there is no guarantee that it happens before arch/powerpc/mm/nohash/kaslr_booke.c is compiled for parallel builds.
The places where you can reliably include <generated/compile.h> are:
- init/ (because init/Makefile can specify the dependency) - arch/*/boot/ (because it is compiled after vmlinux)
Commit f231e4333312 ("hexagon: get rid of #include <generated/compile.h>") fixed the last breakage at that time, but powerpc re-added this.
<generated/compile.h> was unneeded because 'build_str' is almost the same as 'linux_banner' defined in init/version.c
Let's copy the solution from MIPS. (get_random_boot() in arch/mips/kernel/relocate.c)
Fixes: 6a38ea1d7b94 ("powerpc/fsl_booke/32: randomize the kernel image offset") Signed-off-by: Masahiro Yamada masahiroy@kernel.org Acked-by: Scott Wood oss@buserror.net Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20220604085050.4078927-1-masahiroy@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/powerpc/mm/nohash/kaslr_booke.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
--- a/arch/powerpc/mm/nohash/kaslr_booke.c +++ b/arch/powerpc/mm/nohash/kaslr_booke.c @@ -18,7 +18,6 @@ #include <asm/prom.h> #include <asm/kdump.h> #include <mm/mmu_decl.h> -#include <generated/compile.h> #include <generated/utsrelease.h>
struct regions { @@ -36,10 +35,6 @@ struct regions { int reserved_mem_size_cells; };
-/* Simplified build-specific string for starting entropy. */ -static const char build_str[] = UTS_RELEASE " (" LINUX_COMPILE_BY "@" - LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION; - struct regions __initdata regions;
static __init void kaslr_get_cmdline(void *fdt) @@ -70,7 +65,8 @@ static unsigned long __init get_boot_see { unsigned long hash = 0;
- hash = rotate_xor(hash, build_str, sizeof(build_str)); + /* build-specific string for starting entropy. */ + hash = rotate_xor(hash, linux_banner, strlen(linux_banner)); hash = rotate_xor(hash, fdt, fdt_totalsize(fdt));
return hash;