On Wed, Dec 16, 2020 at 11:39:56PM +0000, Paul Cercueil wrote:
> The compressed payload is not necesarily 4-byte aligned, at least when
> compiling with Clang. In that case, the 4-byte value appended to the
> compressed payload that corresponds to the uncompressed kernel image
> size must be read using get_unaligned_le().
>
> This fixes Clang-built kernels not booting on MIPS (tested on a Ingenic
> JZ4770 board).
>
> Fixes: b8f54f2cde78 ("MIPS: ZBOOT: copy appended dtb to the end of the kernel")
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.7
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
> arch/mips/boot/compressed/decompress.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
> index c61c641674e6..47c07990432b 100644
> --- a/arch/mips/boot/compressed/decompress.c
> +++ b/arch/mips/boot/compressed/decompress.c
> @@ -117,7 +117,7 @@ void decompress_kernel(unsigned long boot_heap_start)
> dtb_size = fdt_totalsize((void *)&__appended_dtb);
>
> /* last four bytes is always image size in little endian */
> - image_size = le32_to_cpup((void *)&__image_end - 4);
> + image_size = get_unaligned_le32((void *)&__image_end - 4);
gives me following error
arch/mips/boot/compressed/decompress.c:120:16: error: implicit declaration of function ‘get_unaligned_le32’ [-Werror=implicit-function-declaration]
image_size = get_unaligned_le32((void *)&__image_end - 4);
I've added
#include <asm/unaligned.h>
which fixes the compile error, but I'm wondering why the patch compiled
for you ?
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
