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

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Date:   Wed, 30 Jan 2019 08:27:06 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Liang Yang <liang.yang@...ogic.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

On Wed, Jan 30, 2019 at 10:32:20AM +0100, Miquel Raynal wrote:
> 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

Hi Miquel,

That is totally fine by me, thanks for the quick response!

Nathan