Messages in this thread | | | Subject | Re: [PATCH] mtd: ubi: fix NVMEM over UBI volumes on 32-bit systems | From | Zhihao Cheng <> | Date | Tue, 27 Feb 2024 10:23:17 +0800 |
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在 2024/2/27 2:23, Daniel Golle 写道: > A compiler warning related to sizeof(int) != 8 when calling do_div() > is triggered when building on 32-bit platforms. > Address this by using integer types having a well-defined size where > appropriate. > > Fixes: 3ce485803da1 ("mtd: ubi: provide NVMEM layer over UBI volumes") > Signed-off-by: Daniel Golle <daniel@makrotopia.org> > --- > drivers/mtd/ubi/nvmem.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/mtd/ubi/nvmem.c b/drivers/mtd/ubi/nvmem.c > index b7a93c495d172..5820a170d2512 100644 > --- a/drivers/mtd/ubi/nvmem.c > +++ b/drivers/mtd/ubi/nvmem.c > @@ -23,14 +23,17 @@ struct ubi_nvmem { > static int ubi_nvmem_reg_read(void *priv, unsigned int from, > void *val, size_t bytes) > { > - int err = 0, lnum = from, offs, bytes_left = bytes, to_read; > + uint32_t bytes_left, offs, to_read; > struct ubi_nvmem *unv = priv; > struct ubi_volume_desc *desc; > + uint64_t lnum = from; > + int err = 0; > > desc = ubi_open_volume(unv->ubi_num, unv->vol_id, UBI_READONLY); > if (IS_ERR(desc)) > return PTR_ERR(desc); > > + bytes_left = bytes; The 'bytes' is a size_t type, which has 64 bits on 64-bit platforms. This assignment will lead a type truncation, so should we add a explicit type conversion here to avoid compiler warning? > offs = do_div(lnum, unv->usable_leb_size); > while (bytes_left) { > to_read = unv->usable_leb_size - offs; >
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