A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 10:41:38 -04:00
Code Issues Projects Releases Packages Wiki Activity

fb: defio nopage

Browse source 
Convert fb defio from nopage to fault.
Switch from OOM to SIGBUS if the resource is not available.

Signed-off-by: Nick Piggin <[email protected]>
Cc: "Antonino A. Daplas" <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: Jaya Kumar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2008-02-06 01:39:10 -08:00 • committed by Linus Torvalds
commit 529e55b6a5
2 changed files with 11 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

6
Documentation/fb/deferred_io.txt
View file

@ -7,10 +7,10 @@ IO. The following example may be a useful explanation of how one such setup
works:
- userspace app like Xfbdev mmaps framebuffer
- deferred IO and driver sets up nopage and page_mkwrite handlers
- deferred IO and driver sets up fault and page_mkwrite handlers
- userspace app tries to write to mmaped vaddress
- we get pagefault and reach nopage handler
- nopage handler finds and returns physical page
- we get pagefault and reach fault handler
- fault handler finds and returns physical page
- we get page_mkwrite where we add this page to a list
- schedule a workqueue task to be run after a delay
- app continues writing to that page with no additional cost. this is