[RFC][PATCH] UBI: allocate verification buffer on demand

[josselin.costanzi at mobile-devices.fr]

From: Josselin Costanzi <josselin.costanzi at mobile-devices.fr>

With recent Nand (2MiB erase block), UBI/UBIFS is allocating a lot of RAM each
time a mtd device is attached and each time a ubifs volume is mounted.
The following patch makes UBI allocate peb_buf2 on demand.

Note: I'm not sure using vmalloc while holding buf_mutex is okay or not.
I'm waiting for you comments.

Josselin Costanzi (1):
  UBI: allocate verification buffer on demand

 drivers/mtd/ubi/build.c |    6 ------
 drivers/mtd/ubi/eba.c   |   31 +++++++++++++++++++++++++++----
 drivers/mtd/ubi/ubi.h   |    4 +---
 3 files changed, 28 insertions(+), 13 deletions(-)

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1.7.5.4