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author | Oleg Nesterov <oleg@redhat.com> | 2010-08-10 02:20:30 +0200 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-10 05:45:05 +0200 |
commit | 2ee7c922f20c96dba56fd378a466790d87f42e84 (patch) | |
tree | 9eda39ff1867c4695c1e7349045ccc23176b623b /kernel/exec_domain.c | |
parent | drivers/misc: support for the pressure sensor BMP085 from Bosch Sensortec (diff) | |
download | linux-2ee7c922f20c96dba56fd378a466790d87f42e84.tar.xz linux-2ee7c922f20c96dba56fd378a466790d87f42e84.zip |
sys_personality: remove the bogus checks in sys_personality()->__set_personality() path
Cleanup, no functional changes.
- __set_personality() always changes ->exec_domain/personality, the
special case when ->exec_domain remains the same buys nothing but
complicates the code. Unify both cases to simplify the code.
- The -EINVAL check in sys_personality() was never right. If we assume
that set_personality() can fail we should check the value it returns
instead of verifying that task->personality was actually changed.
Remove it. Before the previous patch it was possible to hit this case
due to overflow problems, but this -EINVAL just indicated the kernel
bug.
OTOH, probably it makes sense to change lookup_exec_domain() to return
ERR_PTR() instead of default_exec_domain if the search in exec_domains
list fails, and report this error to the user-space. But this means
another user-space change, and we have in-kernel users which need fixes.
For example, PER_OSF4 falls into PER_MASK for unkown reason and nobody
cares to register this domain.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Wenming Zhang <wezhang@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exec_domain.c')
-rw-r--r-- | kernel/exec_domain.c | 22 |
1 files changed, 5 insertions, 17 deletions
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c index dd62f8e714ca..0dbeae374225 100644 --- a/kernel/exec_domain.c +++ b/kernel/exec_domain.c @@ -134,23 +134,14 @@ unregister: return 0; } -int -__set_personality(unsigned int personality) +int __set_personality(unsigned int personality) { - struct exec_domain *ep, *oep; - - ep = lookup_exec_domain(personality); - if (ep == current_thread_info()->exec_domain) { - current->personality = personality; - module_put(ep->module); - return 0; - } + struct exec_domain *oep = current_thread_info()->exec_domain; + current_thread_info()->exec_domain = lookup_exec_domain(personality); current->personality = personality; - oep = current_thread_info()->exec_domain; - current_thread_info()->exec_domain = ep; - module_put(oep->module); + return 0; } @@ -192,11 +183,8 @@ SYSCALL_DEFINE1(personality, unsigned int, personality) { unsigned int old = current->personality; - if (personality != 0xffffffff) { + if (personality != 0xffffffff) set_personality(personality); - if (current->personality != personality) - return -EINVAL; - } return old; } |