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| author | Serge E. Hallyn <serge.hallyn@canonical.com> | 2011-05-13 05:27:54 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-13 20:45:33 +0200 |
| commit | 47a150edc2ae734c0f4bf50aa19499e23b9a46f8 (patch) | |
| tree | beeba9befd531285f663559a76f6f0f7378a6c2b /Documentation/early-userspace | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmo... (diff) | |
| download | linux-47a150edc2ae734c0f4bf50aa19499e23b9a46f8.tar.xz linux-47a150edc2ae734c0f4bf50aa19499e23b9a46f8.zip | |
Cache user_ns in struct cred
If !CONFIG_USERNS, have current_user_ns() defined to (&init_user_ns).
Get rid of _current_user_ns. This requires nsown_capable() to be
defined in capability.c rather than as static inline in capability.h,
so do that.
Request_key needs init_user_ns defined at current_user_ns if
!CONFIG_USERNS, so forward-declare that in cred.h if !CONFIG_USERNS
at current_user_ns() define.
Compile-tested with and without CONFIG_USERNS.
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
[ This makes a huge performance difference for acl_permission_check(),
up to 30%. And that is one of the hottest kernel functions for loads
that are pathname-lookup heavy. ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/early-userspace')
0 files changed, 0 insertions, 0 deletions