Re: down_trylock() implementation for MIPS 4KEc CPU implies 64bit arithmetics?

[Emmanuel Michon <em@realmagic.fr>]

On Wed, 2004-05-26 at 22:33, Ralf Baechle wrote:
> On Wed, May 26, 2004 at 06:35:16PM +0200, Emmanuel Michon wrote:
> 
> Semaphores can be implemented using just a single 32-bit variable which
> would mean the same code could be used for 32-bit and 64-bit processors
> as long as only they support ll/sc.  Maybe somebody has the time at his
> hands, *hint*, *hint* :-)
> 
>   Ralf

On 64bit you substract 1ULL<<32

Substracting 1 is enough for it to be algorithmically correct even on
64bit

Do you accept a patch with the version for CONFIG_LLSC = y using a
substraction by 1?

Sincerely yours,

E.M.