lkml.org 
[lkml]   [2012]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v2 17/31] arm64: System calls handling
Date
On Wednesday 22 August 2012, Catalin Marinas wrote:
> But what's more important - moving this wrapper to glibc causes issues
> with the page size. We support both 4KB and 64KB pages on 64-bit systems
> (the latter without compat support). The kernel is in a better position
> to do the shift by a compile-time constant. Glibc would need to enquire
> the actual page size to do the shift before calling sys_mmap_pgoff. If
> we assume in glibc that the shift is always 12, we need another wrapper
> in the kernel anyway for 64KB page configuration. So passing the offset
> in bytes worked best for us.

Right, the kernel interface should really be independent of the page
size, as sys_mmap2 normally is, and sys_mmap2 is not provided here.

Arnd


\
 
 \ /
  Last update: 2012-08-22 14:41    [from the cache]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and my Meterkast|Read the blog