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powerpc/book3e: get rid of #include <generated/compile.h>

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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 f231e43333 ("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: 6a38ea1d7b ("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>
This commit is contained in:
Masahiro Yamada 2022-06-04 17:50:50 +09:00 committed by Greg Kroah-Hartman
parent ff4443f3fc
commit a3e50506ea
1 changed files with 2 additions and 6 deletions
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8
arch/powerpc/mm/nohash/kaslr_booke.c
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@ -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)
@ -72,7 +67,8 @@ static unsigned long __init get_boot_seed(void *fdt)
{
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;