Re: 2.3.99-pre4-[12] with nfs doesn't compile with gcc 2.7.2.3

From: Meelis Roos (mroos@linux.ee)
Date: Sun Apr 09 2000 - 14:32:00 EST

>> fs/fs.o: In function `nfs_refresh_inode':
>> fs/fs.o(.text+0x324d8): undefined reference to `__udivdi3'
>> make: *** [vmlinux] Error 1

JN> The reference to this symbol is generated by gcc 2.7.2.3, but not by
JN> gcc 2.95.3 (and probably egcs and other versions).

Yep, it's generated from the following code:

/*
 * Calculate the number of 512byte blocks used.
 */
static inline unsigned long
nfs_calc_block_size(u64 tsize)
{
        loff_t used = (tsize + 511) / 512;
        return (used > ULONG_MAX) ? ULONG_MAX : used;
}

and gcc 2.7.2.3 generates a call to __udivdi3 for u64 division on ia32:

nfs_calc_block_size:
        pushl %ebp
        movl %esp,%ebp
        subl $8,%esp
        pushl %esi
        pushl %ebx
        movl 8(%ebp),%ebx
        movl 12(%ebp),%esi
        movl %ebx,%eax
        movl %esi,%edx
        addl $511,%eax
        adcl $0,%edx
        pushl $0
        pushl $512
        pushl %edx
        pushl %eax
        call __udivdi3
        ...

Seems that some other architectures have the __udivdi3 function defined
but i38d doesn't. And it probably should. 

-- 
Meelis Roos (mroos@tartu.cyber.ee)

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