a vm address of rdev's sb_page

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Hi all,

I couldn't access easy a rdev super block (mdp_superblock_s) by remote gdb
(exactly at the places where I wish to print it), so are there any
constraints against keep a mdp_supeblock_t * sb_rdev in mdk_rdev_s as well
as  page *sb_page ? like in 2.4 kernel ? It could also make better overall
performance due to that page_address() calls would be unnecessary.

The pointer could be  kmapp'ed once after the sb_page is set and kept as
long as drive is present in the array.

Regards,
Krzysztof Blaszkowski

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