Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1485539 > unrolled thread

Re: [PATCH] mtd: Allocate bdi objects dynamically

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH] mtd: Allocate bdi objects dynamically Richard Weinberger <richard.weinberger@gmail.com> - 2016-09-17 16:50 +0200

#1485539 — Re: [PATCH] mtd: Allocate bdi objects dynamically

On Thu, Aug 4, 2016 at 4:01 PM, Sandeep Jain <Sandeep_Jain@mentor.com> wrote:
> From: Steve Longerbeam <steve_longerbeam@mentor.com>
>
> The MTD backing dev info objects mtd_bdi was statically allocated.
> So when MTD is built as a loadable module, this object fall in the
> vmalloc address space.
>
> The problem with that, is that the BDI APIs use wake_up_bit(), which calls
> virt_to_page() to retrieve the memory zone of the page containing the
> wait_queue to wake up, and virt_to_page() is not valid for vmalloc or
> highmem addresses.
>
> Fix this by allocating the BDI objects dynamically with kmalloc. The
> objects now fall in the logical address space so that BDI APIs will
> work in all cases (mtd builtin or module).
>
> Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
> Signed-off-by: Jim Baxter <jim_baxter@mentor.com>
> Signed-off-by: Sandeep Jain <Sandeep_Jain@mentor.com>

Reviewed-by: Richard Weinberger <richard@nod.at>

-- 
Thanks,
//richard

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web