linux-stable.git/arch/ia64/kernel/process.c, branch linux-3.7.y

vfs: define struct filename and have getname() return it

2012-10-13T00:14:55+00:00

getname() is intended to copy pathname strings from userspace into a
kernel buffer. The result is just a string in kernel space. It would
however be quite helpful to be able to attach some ancillary info to
the string.

For instance, we could attach some audit-related info to reduce the
amount of audit-related processing needed. When auditing is enabled,
we could also call getname() on the string more than once and not
need to recopy it from userspace.

This patchset converts the getname()/putname() interfaces to return
a struct instead of a string. For now, the struct just tracks the
string in kernel space and the original userland pointer for it.

Later, we'll add other information to the struct as it becomes
convenient.

Signed-off-by: Jeff Layton 
Signed-off-by: Al Viro

Merge tag 'please-pull-ia64-for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

2012-10-01T20:56:35+00:00

Pull ia64 update from Tony Luck:
 "Usual mish-mash of ia64 fixes for next merge window"

* tag 'please-pull-ia64-for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  [IA64] xen: Fix return value check in xencomm_vtop()
  [IA64] Must enable interrupts in do_notify_resume_user before calling tracehook_notify_resume()
  [IA64] kexec: Move the dereference below the NULL test
  [IA64] Fix a node distance bug

ia64: Add missing RCU idle APIs on idle loop

2012-09-23T14:44:52+00:00

Traditionally, the entire idle task served as an RCU quiescent state.
But when RCU read side critical sections started appearing within the
idle loop, this traditional strategy became untenable.  The fix was to
create new RCU APIs named rcu_idle_enter() and rcu_idle_exit(), which
must be called by each architecture's idle loop so that RCU can tell
when it is safe to ignore a given idle CPU.

Unfortunately, this fix was never applied to ia64, a shortcoming remedied
by this commit.

Reported by: Tony Luck 
Signed-off-by: Paul E. McKenney 
Cc:  # 3.3+
Signed-off-by: Paul E. McKenney 
Tested by: Tony Luck 
Reviewed-by: Josh Triplett

[IA64] Must enable interrupts in do_notify_resume_user before calling tracehook_notify_resume()

2012-09-20T18:47:13+00:00

If we call with interrupts disabled, we'll be hit with:

WARNING: at kernel/softirq.c:160 local_bh_enable_ip+0x150/0x180() and a stack
trace like this:

Call Trace:
 [] show_stack+0x80/0xa0
 [] dump_stack+0x30/0x50
 [] warn_slowpath_common+0xc0/0x100
 [] warn_slowpath_null+0x40/0x60
 [] local_bh_enable_ip+0x150/0x180
 [] _raw_write_unlock_bh+0x40/0x60
 [] unix_release_sock+0x120/0x5a0
 [] unix_release+0x40/0x60
 [] sock_release+0x60/0x1a0
 [] sock_close+0x30/0xa0
 [] __fput+0x190/0x500
 [] ____fput+0x20/0x40
 [] task_work_run+0x1b0/0x260
 [] do_notify_resume_user+0x110/0x2a0
 [] notify_resume_user+0x40/0x60
 [] skip_rbs_switch+0xe0/0xf0
 [] ia64_ivt+0xffffffff00040720/0x400

Fix-suggested-by: Al Viro 
Signed-off-by: Tony Luck

move key_repace_session_keyring() into tracehook_notify_resume()

2012-05-24T02:09:20+00:00

Signed-off-by: Al Viro

ia64: Remove unused cpu_idle_wait()

2012-05-08T10:35:06+00:00

IA64 does not set CONFIG_ARCH_HAVE_IDLE_WAIT and cpuidle uses a
generic function now. Remove the unused code.

Signed-off-by: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Tony Luck 
Link: http://lkml.kernel.org/r/20120507175652.392394511@linutronix.de

Fix ia64 build errors (fallout from system.h disintegration)

2012-03-29T21:16:06+00:00

Fix this build error on ia64:

  In file included from include/linux/sched.h:92,
                  from arch/ia64/kernel/asm-offsets.c:9:
  include/linux/llist.h:59:25: error: asm/cmpxchg.h: No such file or directory
  make[1]: *** [arch/ia64/kernel/asm-offsets.s] Error 1

Right now we don't seem to need any actual contents for the
asm/cmpxchg.h to make the build work ...  so leave the migration of
xchg() and cmpxchg() to this new header file for a future patch.

Also process.c needs  (for definition of pfm_syst_info).

Signed-off-by: Tony Luck 
Signed-off-by: Linus Torvalds

sched/rt: Use schedule_preempt_disabled()

2012-03-01T09:28:03+00:00

Coccinelle based conversion.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Link: http://lkml.kernel.org/n/tip-24swm5zut3h9c4a6s46x8rws@git.kernel.org
Signed-off-by: Ingo Molnar

ACPI, intel_idle: Cleanup idle= internal variables

2011-01-12T17:47:30+00:00

Having four variables for the same thing:
  idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides
is rather confusing and unnecessary complex.

if idle= boot param is passed, only set up one variable:
boot_option_idle_overrides

Introduces following functional changes/fixes:
  - intel_idle driver does not register if any idle=xy
    boot param is passed.
  - processor_idle.c will also not register a cpuidle driver
    and get active if idle=halt is passed.
    Before a cpuidle driver with one (C1, halt) state got registered
    Now the default_idle function will be used which finally uses
    the same idle call to enter sleep state (safe_halt()), but
    without registering a whole cpuidle driver.

That means idle= param will always avoid cpuidle drivers to register
with one exception (same behavior as before):
idle=nomwait
may still register acpi_idle cpuidle driver, but C1 will not use
mwait, but hlt. This can be a workaround for IO based deeper sleep
states where C1 mwait causes problems.

Signed-off-by: Thomas Renninger 
cc: x86@kernel.org
Signed-off-by: Len Brown

Make do_execve() take a const filename pointer

2010-08-18T01:07:43+00:00

Make do_execve() take a const filename pointer so that kernel_execve() compiles
correctly on ARM:

arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type

This also requires the argv and envp arguments to be consted twice, once for
the pointer array and once for the strings the array points to.  This is
because do_execve() passes a pointer to the filename (now const) to
copy_strings_kernel().  A simpler alternative would be to cast the filename
pointer in do_execve() when it's passed to copy_strings_kernel().

do_execve() may not change any of the strings it is passed as part of the argv
or envp lists as they are some of them in .rodata, so marking these strings as
const should be fine.

Further kernel_execve() and sys_execve() need to be changed to match.

This has been test built on x86_64, frv, arm and mips.

Signed-off-by: David Howells 
Tested-by: Ralf Baechle 
Acked-by: Russell King 
Signed-off-by: Linus Torvalds