Re: [PATCH] mtd: rawnand: meson: Fix linking error on 32-bit platforms

Liang Yang
2019-01-30T09:26:14Z

Hi Nathan,

On 2019/1/30 5:46, Nathan Chancellor wrote:
> On arm little endian allyesconfig:
>
> ld.lld: error: undefined symbol: __aeabi_uldivmod
> >>> referenced by meson_nand.c
> >>> mtd/nand/raw/meson_nand.o:(meson_nfc_setup_data_interface) in archive drivers/built-in.a
>
> The dividend tBERS_max is u64, meaning we need to use DIV_ROUND_UP_ULL
> (which wraps do_div) to prevent the compiler from emitting
> __aebi_uldivmod.
>
> Fixes: 2d570b34b41a ("mtd: rawnand: meson: add support for Amlogic NAND flash controller")
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> ---
> drivers/mtd/nand/raw/meson_nand.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index e858d58d97b0..6f12a96195d1 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -1116,8 +1116,8 @@ int meson_nfc_setup_data_interface(struct nand_chip *nand, int csline,
> div * NFC_CLK_CYCLE);
> meson_chip->tadl = DIV_ROUND_UP(PSEC_TO_NSEC(timings->tADL_min),
> div * NFC_CLK_CYCLE);
> - tbers_clocks = DIV_ROUND_UP(PSEC_TO_NSEC(timings->tBERS_max),
> - div * NFC_CLK_CYCLE);
> + tbers_clocks = DIV_ROUND_UP_ULL(PSEC_TO_NSEC(timings->tBERS_max),
> + div * NFC_CLK_CYCLE);

Looks good to me:

Acked-by: Liang Yang <liang.yang@amlogic.com>

> meson_chip->tbers_max = ilog2(tbers_clocks);
> if (!is_power_of_2(tbers_clocks))
> meson_chip->tbers_max++;