Messages in this thread | | | Date | Wed, 30 Mar 2011 12:53:42 -0400 | From | Vivek Goyal <> | Subject | Re: [PATCH] blk-throttle: don't call xchg on bool |
| |
On Wed, Mar 30, 2011 at 03:51:34PM +0200, Andreas Schwab wrote: > Vivek Goyal <vgoyal@redhat.com> writes: > > > Which arch creates the problem and what's the issue here if data type > > is smaller than 32bit? > > Just look at the various implementations in arch/*/include/asm/system.h: > > - arm: supports only one and 4 byte xchg > - avr32: supports only 4 byte xchg > - frv: supports only 4 byte xchg > - m32r: SMP supports only 4 byte xchg > - microblaze: supports only one and 4 byte xchg > > etc. > > > Is it a compile time warning? > > Most implementations turn the use of xchg with a bad pointer into a link > error.
Thanks Andreas. I get it. I did check arm and it is supporting only one and 4 byte xchg.
Vivek
| |