"chaitanya Huilgol" <[email protected]> writes:
> {
> __asm__ __volatile__ (
> "# LFPUSH \n\t"
> "1:\t"
> "movl %2, (%1) \n"
> LOCK "cmpxchg %1, %0 \n\t"
> "jnz 1b \n\t"
> :
> :"m" (*lf), "r" (cl), "a" (lf->top)
You don't tell gcc *lf is modified.
> );
> }
>
> cell* pop (lifo * lf)
> {
> cell* v=0;
> __asm__ __volatile__ (
> "# LFPOP \n\t"
> "testl %%eax, %%eax \n\t"
> "jz 20f \n"
> "10:\t"
> "movl (%%eax), %%ebx \n\t"
> "movl %%edx, %%ecx \n\t"
> "incl %%ecx \n\t"
Nothing uses the incremented %ecx
> LOCK "cmpxchg8b %1 \n\t"
> "jz 20f \n\t"
> "testl %%eax, %%eax \n\t"
> "jnz 10b \n"
> "20:\t"
> :"=a" (v)
> :"m" (*lf),
And you don't tell *lf is modified again.
It could be just a miscompilation caused by your wrong asm constraints.
-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
