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2012-10-11make sure that kernel_thread() callbacks call do_exit() themselvesAl Viro1-2/+2
Most of them never returned anyway - only two functions had to be changed. That allows to simplify their callers a whole lot. Note that this does *not* apply to kthread_run() callbacks - all of those had been called from the same kernel_thread() callback, which did do_exit() already. This is strictly about very few low-level kernel_thread() callbacks (there are only 6 of those, mostly as part of kthread.h and kmod.h exported mechanisms, plus kernel_init() itself). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11make sure that we always have a return path from kernel_execve()Al Viro1-8/+5
The only place where kernel_execve() is called without a way to return to the caller of kernel_thread() callback is kernel_post(). Reorganize kernel_init()/kernel_post() - instead of the former calling the latter in the end (and getting freed by it), have the latter *begin* with calling the former (and turn the latter into kernel_thread() callback, of course). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11ppc: eeh_event should just use kthread_run()Al Viro1-3/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11don't bother with kernel_thread/kernel_execve for launching linuxrcAl Viro1-25/+16
exec_usermodehelper_fns() will do just fine... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11alpha: get rid of switch_stack argument of do_work_pending()Al Viro2-23/+20
... and now the asm glue side of that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11alpha: don't bother passing switch_stack separately from regsAl Viro1-13/+13
It's needed only in setup_sigcontext() and it's always reg - <constant>; no point passing it all way down through the call chain. This is just the signal.c side of that stuff; next will come the asm glue one... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11alpha: take SIGPENDING/NOTIFY_RESUME loop into signal.cAl Viro2-17/+20
Turn the slow side of work_pending into C function, including all the looping. What we get out of that: * we do _not_ call get_signal_to_deliver() with IRQs disabled anymore * no need to save/restore volatiles on each pass if there turns to be more than one (unlikely, but still) * all double-restart prevention is in C now. * glue gets simpler. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-11alpha: simplify TIF_NEED_RESCHED handlingAl Viro1-17/+9
In case we have both NEED_RESCHED and SIGPENDING/NOTIFY_RESUME, handle the latter first. We'll get to original priorities in the next commit, but now that allows to simplify the treatment of NEED_RESCHED-only case nicely. Namely, now there no need to preserve the data for restarts across the call of schedule() in $work_resched; we can get there only if we had either returned from syscall without SIGPENDING (in which case we should've had no restart-worthy return value and want no restarts) or already got through do_notify_resume() call (in which case we want no restarts anymore). So we can just slap 0 into $19 instead of preserving it (and $20). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01alpha: don't open-code trace_report_syscall_{enter,exit}Al Viro2-26/+19
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01Uninclude linux/freezer.hRichard Weinberger12-12/+0
This include is no longer needed. (seems to be a leftover from try_to_freeze()) Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01m32r: trim masksAl Viro1-2/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01avr32: trim masksAl Viro1-7/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01tile: don't bother with SIGTRAP in setup_frameAl Viro2-19/+2
Tell signal_delivered() to do it instead. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01microblaze: don't bother with SIGTRAP in setup_rt_frame()Al Viro1-5/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mn10300: don't bother with SIGTRAP in setup_frame()Al Viro1-8/+0
... just tell signal_delivered() to do it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01frv: no need to raise SIGTRAP in setup_frame()Al Viro1-8/+0
signal_delivered() will do it in the same case... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01x86: get rid of duplicate code in case of CONFIG_VM86Al Viro1-11/+6
no need to have the call of do_notify_resume() + checks around it duplicated for vm86 case - a bit of rearranging of ifdefs and we'll have a perfectly fine copy to jump back to. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01unicore32: remove pointless testAl Viro1-2/+0
we can get into work_pending only if at least one of NEED_RESCHED, SIGPENDING or NOTIFY_RESUME is set. So once we'd found no NEED_RESCHED, there's no need to check that one of the other two is set. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01h8300: trim _TIF_WORK_MASKAl Viro1-1/+2
Only the three usual flags (NEED_RESCHED/SIGPENDING/NOTIFY_RESUME) are looked at in the code checking _TIF_WORK_MASK on that one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01parisc: decide whether to go to slow path (tracesys) based on thread flagsAl Viro2-3/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01parisc: don't bother looping in do_signal()Al Viro1-22/+7
entry.S code had been looping until no pending signals are left since 2005 anyway; no need to bother with that in do_signal() itself. If the failure to set a sigframe up raises SIGSEGV, we'll just pick it up the next time around the loop(s) in entry.S anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01parisc: fix double restartsAl Viro3-10/+10
Don't bother restoring r28 on syscall restarts; it's clobbered by syscall anyway. Reuse (now unused) ->orig_r28 as "no restarts allowed" flag. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01bury the rest of TIF_IRETAl Viro5-10/+0
Some architectures had blindly copied it for no reason whatsoever. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01sanitize tsk_is_polling()Al Viro26-38/+20
Make default just return 0. The current default (checking TIF_POLLING_NRFLAG) is taken to architectures that need it; ones that don't do polling in their idle threads don't need to defined TIF_POLLING_NRFLAG at all. ia64 defined both TS_POLLING (used by its tsk_is_polling()) and TIF_POLLING_NRFLAG (not used at all). Killed the latter... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01bury _TIF_RESTORE_SIGMASKAl Viro17-17/+0
never used... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01unicore32: unobfuscate _TIF_WORK_MASKAl Viro1-1/+2
bits 3..7 in flags are never set there, so this 0xff is pointless Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mips: NOTIFY_RESUME is not needed in TIF masksAl Viro1-2/+1
If it's set, SIGPENDING is also set. And SIGPENDING is present in the masks... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mips: merge the identical "return from syscall" per-ABI codeAl Viro5-51/+13
No need to keep 4 copies of that stuff; merged and taken to entry.S, unused public symbols there killed off. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mips: unobfuscate _TIF..._MASKAl Viro1-3/+4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mips: prevent hitting do_notify_resume() with !user_mode(regs)Al Viro2-8/+3
too late to do anything there... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01ia64: can't reach do_signal() when returning to kernel modeAl Viro1-8/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01score: fix bogus restarts on sigreturn()Al Viro1-0/+1
we *really* don't want to have restart logics hit when we are returning from sigreturn() - random replacement of %r4 with -4 just because a signal had been noticed from timer interrupt that came when %r4 happened to contain -514 is not nice at all. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mn10300: get rid of calling do_notify_resume() when returning to kernel modeAl Viro2-5/+4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01xtensa: can't get to do_notify_resume() when user_mode(regs) is not trueAl Viro1-3/+0
asm glue checks that Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01c6x: switch to generic kernel_thread()Al Viro3-21/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01c6x: switch to generic sys_execveMark Salter4-50/+1
Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01c6x: switch to generic kernel_execveMark Salter2-7/+8
Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01c6x: add ret_from_kernel_thread(), simplify kernel_thread()Mark Salter2-26/+32
Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mn10300: convert to generic kernel_thread()Al Viro3-36/+19
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mn10300: switch to generic kernel_execve()Al Viro6-49/+13
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mn10300: switch to generic sys_execve()Al Viro3-16/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01mn10300: split ret_from_fork, simplify kernel_thread()Al Viro5-71/+27
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01frv: switch to generic kernel_thread()Al Viro3-23/+20
2012-10-01frv: switch to generic kernel_execveAl Viro5-39/+10
Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01frv: switch to generic sys_execve()Al Viro3-19/+2
current_pt_regs() here is simply __frame Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01frv: split ret_from_fork, simplify kernel_thread() a lotAl Viro5-100/+32
Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01m68k: switch to generic sys_execve()/kernel_execve()Al Viro5-37/+9
The tricky part here is that task_pt_regs() on m68k works *only* for process inside do_signal(). However, we need something much simpler - pt_regs of a process inside do_signal() may be at different offsets from the stack bottom, depending on the way we'd entered the kernel, but for a task inside sys_execve() it *is* at constant offset. Moreover, for a kernel thread about to become a userland process the same location is also fine - setting sp to that will leave the kernel stack pointer at the very bottom of the kernel stack when we finally switch to userland. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01m68k: split ret_from_fork(), simplify kernel_thread()Al Viro4-62/+36
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-01m68k: always set stack frame format for ColdFire on thread startGreg Ungerer1-11/+12
The stack frame "format" field needs to be explicitly set on thread creation on ColdFire. For a normal long word aligned user stack pointer the frame format is 0x4. We were doing this for non-MMU ColdFire, but not for the case with MMU enabled. So fix it so we always do it if targeting ColdFire. The old code happend to rely on the stack frame format being inhereted from the process calling exec. Furture changes means that may not always work, so we really do want to set it explicitly. Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-09-30powerpc: switch to generic sys_execve()/kernel_execve()Al Viro8-51/+21
the only non-obvious part is that current_pt_regs() is really needed here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace uses (the thing task_pt_regs() is intended for), but not for us. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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