Hi Thomas,
Le lun. 28 déc. 2020 à 23:25, Thomas Bogendoerfer tsbogend@alpha.franken.de a écrit :
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@vger.kernel.org # v4.7 Signed-off-by: Paul Cercueil paul@crapouillou.net
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 ?
No idea - but it does compile fine without the include here. Probably a defconfig difference.
Cheers, -Paul