Re: [PATCH V4 1/2] ACPI / EC: Fix broken 64bit big-endian users of 'global_lock'

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 25-09-15, 22:58, Rafael J. Wysocki wrote:
> Say you have three adjacent fields in a structure, x, y, z, each one byte long.
> Initially, all of them are equal to 0.
> 
> CPU A writes 1 to x and CPU B writes 2 to y at the same time.
> 
> What's the result?

But then two CPUs can update the same variable as well, and we must
have proper locking in place to fix that.

Anyway, that problem isn't here for sure as its between two
unsigned-longs. So, should I just move it to bool and resend ?

-- 
viresh

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>



[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]