* PAGE_ALIGN + PAGE_SHIFT from userspace
@ 2006-12-18 9:04 Daniel Laird
2006-12-18 12:47 ` Thiemo Seufer
0 siblings, 1 reply; 3+ messages in thread
From: Daniel Laird @ 2006-12-18 9:04 UTC (permalink / raw)
To: linux-mips
Hi All,
I was using linux 2.6.17.13 on my MIPS and it was all going well. I am just
porting to 2.6.19 and am having a couple of issues.
My first issue is that i used to mmap a buffer from user space. I used to
use a PAGE_ALIGN macro when doing this:
/** to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
this worked as PAGE_SIZE and PAGE_MASK were available in page.h.
This have now been moved inside the #ifdef KERNEL guard in the header file.
Meaning these are no longer available.
Are these available somewhere else?
Should I be doing something different to mmap?
Any help appreciated
Daniel Laird
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* Re: PAGE_ALIGN + PAGE_SHIFT from userspace
2006-12-18 9:04 PAGE_ALIGN + PAGE_SHIFT from userspace Daniel Laird
@ 2006-12-18 12:47 ` Thiemo Seufer
2006-12-19 8:18 ` Daniel Laird
0 siblings, 1 reply; 3+ messages in thread
From: Thiemo Seufer @ 2006-12-18 12:47 UTC (permalink / raw)
To: Daniel Laird; +Cc: linux-mips
Daniel Laird wrote:
>
> Hi All,
>
> I was using linux 2.6.17.13 on my MIPS and it was all going well. I am just
> porting to 2.6.19 and am having a couple of issues.
>
> My first issue is that i used to mmap a buffer from user space. I used to
> use a PAGE_ALIGN macro when doing this:
> /** to align the pointer to the (next) page boundary */
> #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
>
> this worked as PAGE_SIZE and PAGE_MASK were available in page.h.
It didn't work reliably since the pagesize is a kernel configuration option.
> This have now been moved inside the #ifdef KERNEL guard in the header file.
> Meaning these are no longer available.
>
> Are these available somewhere else?
> Should I be doing something different to mmap?
Use the libc's sysconf(_SC_PAGESIZE) function.
Thiemo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2006-12-18 9:04 PAGE_ALIGN + PAGE_SHIFT from userspace Daniel Laird
2006-12-18 12:47 ` Thiemo Seufer
2006-12-19 8:18 ` Daniel Laird
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