Very Computer

by **Felix Opa** » Mon, 26 Nov 2001 01:42:23

I want to printk a loff_t from the read-method of a char-device and
gcc tells me, that %l won't work. I saw in the header, that loff_t is
a long long, and the userspace-printf can printf those with %ll, but
printk doesn't know %ll. Is there any method of printing a long long
with printk, or will I have to split them into two longs? Or is it OK
for testing to assume that my device won't handle large amounts of
data and there won't be a caller who wants to read more than 4 GB?
And: if I want to printk the lower 32 bit of my long long - will I
have to cast it on long or will I also need to &0xffffffff it?

aTdHvAaNnKcSe,
Felix

by **Norm Dresne** » Mon, 26 Nov 2001 02:45:34

Quote:> I want to printk a loff_t from the read-method of a char-device and
> gcc tells me, that %l won't work. I saw in the header, that loff_t is
> a long long, and the userspace-printf can printf those with %ll, but
> printk doesn't know %ll. Is there any method of printing a long long
> with printk, or will I have to split them into two longs? Or is it OK
> for testing to assume that my device won't handle large amounts of
> data and there won't be a caller who wants to read more than 4 GB?
> And: if I want to printk the lower 32 bit of my long long - will I
> have to cast it on long or will I also need to &0xffffffff it?

When I have to print ll-type from the kernel, I either fake it with a
pseudo array of longs or test the MSW and, if it's zero, use a %ld/%lu on
the lower 32-bits.

If you're willing to extract the module _divdi3.o from the gcc-library
and link it with your program -- which I've been doing with no problems for
years now -- you can do ll-division in your own function and create your own
lltoascii-function.

Norm

Very Computer

loff_t / long long and printk()?

loff_t / long long and printk()?

loff_t / long long and printk()?