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

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Date:   Wed, 30 Jan 2019 10:32:20 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Liang Yang <liang.yang@...ogic.com>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Richard Weinberger <richard@....at>,
        Kevin Hilman <khilman@...libre.com>,
        <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: rawnand: meson: Fix linking error on 32-bit
 platforms

Hi Liang, Nathan,

Liang Yang <liang.yang@...ogic.com> wrote on Wed, 30 Jan 2019 17:26:39
+0800:

> 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@...il.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@...ogic.com>

This is nand/next material, so if you don't mind I would like to squash
this fix into the original commit inserting the driver.


Thanks,
Miquèl