About the workaround for the 484863 L220 erratum

[Asano, Yasushi]

Hi,

I am looking for a workaround for the 484863 L220 erratum. 
"484863: The Cache Sync operation does not guarantee that the Eviction Buffer is empty"

Then I found a patch as below.
http://www.linux-arm.org/git?p=linux-2.6-stable.git;a=commitdiff;h=61f0ab1658f41f34c1910848063c565095a47864
Though It seems to need should correct this probrem, this patch has not been marged into the mainline yet.

v3.6.9　arch/arm/include/asm/io.h
#define writel_relaxed(v,c)     __raw_writel((__force u32) cpu_to_le32(v),c)

Could you please tell me if you know the reason why it does not get into the mainline.
Thank you for your time and assistance regarding this matter.