Re: [PATCH] bitmap: parse input from kernel and user buffers

Reinette Chatre wrote:
> lib/bitmap.c:bitmap_parse() is a library function that received as
> input a user buffer. This seemed to have originated from the way
> the write_proc function of the /proc filesystem operates.
>
> This has been reworked to not use kmalloc and eliminates a lot
> of get_user() overhead by performing one access_ok before using
> __get_user().
> We need to test if we are in kernel or user space (is_user) and access
> the buffer differently. We cannot use __get_user() to access kernel
> addresses in all cases, for example in architectures with separate
> address space for kernel and user.
>
> This function will be useful for other uses as well; for example,
> taking input  for /sysfs instead of /proc, so it was changed to accept
> kernel buffers. We have this use for the Linux UWB project, as part
> as the upcoming bandwidth allocator code.
>
> Only a few routines used this function and they were changed too.
>
> Signed-off-by: Reinette Chatre <[email protected]>
Signed-off-by: Inaky Perez-Gonzalez <[email protected]>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• References:
  • [PATCH] bitmap: separate bitmap parsing for user buffer and kernel buffer
    • From: Reinette Chatre <[email protected]>
  • Re: [PATCH] bitmap: separate bitmap parsing for user buffer and kernel buffer
    • From: Andrew Morton <[email protected]>
  • [PATCH] bitmap: parse kernel and user buffers
    • From: Reinette Chatre <[email protected]>
  • [PATCH] bitmap: parse input from kernel and user buffers
    • From: Reinette Chatre <[email protected]>

• Prev by Date: [PATCH 2.6.19-rc1 V9] drivers: add LCD support
• Next by Date: Re: ohci1394 regression in 2.6.19-rc1 (was Re: Merge window closed: v2.6.19-rc1)
• Previous by thread: [PATCH] bitmap: parse input from kernel and user buffers
• Next by thread: Re: [PATCH] bitmap: separate bitmap parsing for user buffer and kernel buffer
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]