The patch titled
Add documentation for the vm_ops->access function.
has been added to the -mm tree. Its filename is
access_process_vm-device-memory-infrastructure-fix.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: Add documentation for the vm_ops->access function.
From: Rik van Riel <riel@xxxxxxxxxx>
Add documentation for the vm_ops->access function.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/Locking | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN Documentation/filesystems/Locking~access_process_vm-device-memory-infrastructure-fix Documentation/filesystems/Locking
--- a/Documentation/filesystems/Locking~access_process_vm-device-memory-infrastructure-fix
+++ a/Documentation/filesystems/Locking
@@ -510,6 +510,7 @@ prototypes:
void (*close)(struct vm_area_struct*);
int (*fault)(struct vm_area_struct*, struct vm_fault *);
int (*page_mkwrite)(struct vm_area_struct *, struct page *);
+ int (*access)(struct vm_area_struct *, unsigned long, void*, int, int);
locking rules:
BKL mmap_sem PageLocked(page)
@@ -517,6 +518,7 @@ open: no yes
close: no yes
fault: no yes
page_mkwrite: no yes no
+access: no yes
->page_mkwrite() is called when a previously read-only page is
about to become writeable. The file system is responsible for
@@ -525,6 +527,11 @@ taking to lock out truncate, the page ra
within i_size. The page mapping should also be checked that it is not
NULL.
+ ->access() is called when get_user_pages() fails in
+acces_process_vm(), typically used to debug a process through
+/proc/pid/mem or ptrace. This function is needed only for
+VM_IO | VM_PFNMAP VMAs.
+
================================================================================
Dubious stuff
_
Patches currently in -mm which might be from riel@xxxxxxxxxx are
access_process_vm-device-memory-infrastructure.patch
access_process_vm-device-memory-infrastructure-fix.patch
use-generic_access_phys-for-dev-mem-mappings.patch
use-generic_access_phys-for-pci-mmap-on-x86.patch
powerpc-ioremap_prot.patch
spufs-use-the-new-vm_ops-access.patch
spufs-use-the-new-vm_ops-access-fix.patch
vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch
idr-change-the-idr-structure.patch
idr-rename-some-of-the-idr-apis-internal-routines.patch
idr-fix-a-printk-call.patch
idr-error-checking-factorization.patch
idr-make-idr_get_new-rcu-safe.patch
idr-make-idr_find-rcu-safe.patch
idr-make-idr_remove-rcu-safe.patch
ipc-call-idr_find-without-locking-in-ipc_lock.patch
ipc-get-rid-of-ipc_lock_down.patch
make-mm-rmapc-anon_vma_cachep-static.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
