19 Oct, 2010
1 commit
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Provide a mechanism that allows running code in IRQ context. It is
most useful for NMI code that needs to interact with the rest of the
system -- like wakeup a task to drain buffers.Perf currently has such a mechanism, so extract that and provide it as
a generic feature, independent of perf so that others may also
benefit.The IRQ context callback is generated through self-IPIs where
possible, or on architectures like powerpc the decrementer (the
built-in timer facility) is set to generate an interrupt immediately.Architectures that don't have anything like this get to do with a
callback from the timer tick. These architectures can call
irq_work_run() at the tail of any IRQ handlers that might enqueue such
work (like the perf IRQ handler) to avoid undue latencies in
processing the work.Signed-off-by: Peter Zijlstra
Acked-by: Kyle McMartin
Acked-by: Martin Schwidefsky
[ various fixes ]
Signed-off-by: Huang Ying
LKML-Reference:
Signed-off-by: Ingo Molnar
08 Oct, 2010
1 commit
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Conflicts:
arch/x86/kernel/module.cMerge reason: Resolve the conflict, pick up fixes.
Signed-off-by: Ingo Molnar
30 Sep, 2010
1 commit
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Commit c52c2ddc1dfa ("alpha: switch osf_sigprocmask() to use of
sigprocmask()") had several problems. The more obvious compile issues
got fixed in commit 0f44fbd297e1 ("alpha: fix compile problem in
arch/alpha/kernel/signal.c"), but it also caused a regression.Since _BLOCKABLE is already the set of signals that can be blocked, the
code should do "newmask & _BLOCKABLE" rather than inverting _BLOCKABLE
before masking.Reported-by: Michael Cree
Patch-by: Al Viro
Patch-by: Ivan Kokshaysky
Signed-off-by: Linus Torvalds
29 Sep, 2010
1 commit
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Tssk. Apparently Al hadn't checked commit c52c2ddc1dfa ("alpha: switch
osf_sigprocmask() to use of sigprocmask()") at all. It doesn't compile.Fixed as per suggestions from Michael Cree.
Reported-by: Michael Cree
Cc: Al Viro
Signed-off-by: Linus Torvalds
28 Sep, 2010
2 commits
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Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
get rid of a useless wrapper, while we are at it
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds
26 Sep, 2010
2 commits
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rdusp() gives us the right value only for the current thread...
Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds -
We want interrupts disabled on all paths leading to RESTORE_ALL;
otherwise, we are risking an IRQ coming between the updates of
alpha_mv->hae_cache and *alpha_mv->hae_register and set_hae()
within the IRQ getting badly confused.RESTORE_ALL used to play with disabling IRQ itself, but that got
removed back in 2002, without making sure we had them disabled
on all paths. It's cheaper to make sure we have them disabled than
to revert to original variant...Remove the detritus left from that commit back in 2002; we used to
need a reload of $0 and $1 since swpipl would change those, but
doing that had become pointless when we stopped doing swpipl in
there...Signed-off-by: Al Viro
Signed-off-by: Linus Torvalds
21 Sep, 2010
1 commit
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Merge reason: Pick up the latest fixes in -rc5.
Signed-off-by: Ingo Molnar
19 Sep, 2010
9 commits
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Unlike the other targets, alpha sets _one_ sigframe and
buggers off until the next syscall/interrupt, even if
more signals are pending. It leads to quite a few unpleasant
inconsistencies, starting with SIGSEGV potentially arriving
not where it should and including e.g. mess with sigsuspend();
consider two pending signals blocked until sigsuspend()
unblocks them. We pick the first one; then, if we are hit
by interrupt while in the handler, we process the second one
as well. If we are not, and if no syscalls had been made,
we get out of the first handler and leave the second signal
pending; normally sigreturn() would've picked it anyway, but
here it starts with restoring the original mask and voila -
the second signal is blocked again. On everything else we
get both delivered consistently.It's actually easy to fix; the only thing to watch out for
is prevention of double syscall restart. Fortunately, the
idea I've nicked from arm fix by rmk works just fine...Testcase demonstrating the behaviour in question; on alpha
we get one or both flags set (usually one), on everything
else both are always set.
#include
#include
int had1, had2;
void f1(int sig) { had1 = 1; }
void f2(int sig) { had2 = 1; }
main()
{
sigset_t set1, set2;
sigemptyset(&set1);
sigemptyset(&set2);
sigaddset(&set2, 1);
sigaddset(&set2, 2);
signal(1, f1);
signal(2, f2);
sigprocmask(SIG_SETMASK, &set2, NULL);
raise(1);
raise(2);
sigsuspend(&set1);
printf("had1:%d had2:%d\n", had1, had2);
}Tested-by: Michael Cree
Signed-off-by: Al Viro
Signed-off-by: Matt Turner -
The way sigreturn() is implemented on alpha breaks PTRACE_SYSCALL,
all way back to 1.3.95 when alpha has grown PTRACE_SYSCALL support.What happens is direct return to ret_from_syscall, in order to bypass
mangling of a3 (error indicator) and prevent other mutilations of
registers (e.g. by syscall restart). That's fine, but... the entire
TIF_SYSCALL_TRACE codepath is kept separate on alpha and post-syscall
stopping/notifying the tracer is after the syscall. And the normal
path we are forcibly switching to doesn't have it.So we end up with *one* stop in traced sigreturn() vs. two in other
syscalls. And yes, strace is visibly broken by that; try to strace
the following
#include
#include
void f(int sig) {}
main()
{
signal(SIGHUP, f);
raise(SIGHUP);
write(1, "eeeek\n", 6);
}
and watch the show. The
close(1) = 405
in the end of strace output is coming from return value of write() (6 ==
__NR_close on alpha) and syscall number of exit_group() (__NR_exit_group ==
405 there).The fix is fairly simple - the only thing we end up missing is the call
of syscall_trace() and we can tell whether we'd been called from the
SYSCALL_TRACE path by checking ra value. Since we are setting the
switch_stack up (that's what sys_sigreturn() does), we have the right
environment for calling syscall_trace() - just before we call
undo_switch_stack() and return. Since undo_switch_stack() will overwrite
s0 anyway, we can use it to store the result of "has it been called from
SYSCALL_TRACE path?" check. The same thing applies in rt_sigreturn().Tested-by: Michael Cree
Signed-off-by: Al Viro
Signed-off-by: Matt Turner -
Old code used to set regs->r0 and regs->r19 to force the right
return value. Leaving that after switch to ERESTARTNOHAND
was a Bad Idea(tm), since now that screws the restart - if we
hit the case when get_signal_to_deliver() returns 0, we will
step back to syscall insn, with v0 set to EINTR and a3 to 1.
The latter won't matter, since EINTR is 4, aka __NR_write.Testcase:
#include
#define _GNU_SOURCE
#include
#includemain()
{
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCONT);
sigprocmask(SIG_SETMASK, &mask, NULL);
kill(0, SIGCONT);
syscall(__NR_sigsuspend, 1, "b0rken\n", 7);
}results on alpha in immediate message to stdout...
Fix is obvious; moreover, since we don't need regs anymore, we can
switch to normal prototypes for these guys and lose the wrappers.
Even better, rt_sigsuspend() is identical to generic version in
kernel/signal.c now.Tested-by: Michael Cree
Signed-off-by: Al Viro
Signed-off-by: Matt Turner -
same thing as had been done on other targets back in 2003 -
move setting ->restart_block.fn into {rt_,}sigreturn().Tested-by: Michael Cree
Signed-off-by: Al Viro
Signed-off-by: Matt Turner -
Pending work from the performance event subsystem is executed in
the timer interrupt. This patch shifts the call to
perf_event_do_pending() before the call to update_process_times()
as the latter may call back into the perf event subsystem and it
is prudent to have the pending work executed first.Signed-off-by: Michael Cree
Signed-off-by: Matt Turner -
The 2.6.36-rc kernel added three new system calls:
fanotify_init, fanotify_mark, and prlimit64. This
patch wires them up on Alpha.Built and booted on an XP900. Untested beyond that.
Signed-off-by: Mikael Pettersson
Signed-off-by: Matt Turner -
All uses of the BKL on alpha are totally bogus, nothing
is really protected by this. Remove the remaining users
so we don't have to mark alpha as 'depends on BKL'.Signed-off-by: Arnd Bergmann
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: linux-alpha@vger.kernel.org
Signed-off-by: Matt Turner -
Acked-by: Jan-Benedict Glaw
Signed-off-by: matt mooney
Signed-off-by: Matt Turner -
Acked-by: Richard Henderson
Signed-off-by: Joe Perches
Signed-off-by: Matt Turner
15 Sep, 2010
2 commits
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Also fix a few compile errors due to undefined and duplicated
variables.Signed-off-by: Michael Cree
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
…stedt/linux-2.6-trace into perf/core
10 Sep, 2010
5 commits
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Neither the overcommit nor the reservation sysfs parameter were
actually working, remove them as they'll only get in the way.Signed-off-by: Peter Zijlstra
Cc: paulus
LKML-Reference:
Signed-off-by: Ingo Molnar -
Replace pmu::{enable,disable,start,stop,unthrottle} with
pmu::{add,del,start,stop}, all of which take a flags argument.The new interface extends the capability to stop a counter while
keeping it scheduled on the PMU. We replace the throttled state with
the generic stopped state.This also allows us to efficiently stop/start counters over certain
code paths (like IRQ handlers).It also allows scheduling a counter without it starting, allowing for
a generic frozen state (useful for rotating stopped counters).The stopped state is implemented in two different ways, depending on
how the architecture implemented the throttled state:1) We disable the counter:
a) the pmu has per-counter enable bits, we flip that
b) we program a NOP event, preserving the counter state2) We store the counter state and ignore all read/overflow events
Signed-off-by: Peter Zijlstra
Cc: paulus
Cc: stephane eranian
Cc: Robert Richter
Cc: Will Deacon
Cc: Paul Mundt
Cc: Frederic Weisbecker
Cc: Cyrill Gorcunov
Cc: Lin Ming
Cc: Yanmin
Cc: Deng-Cheng Zhu
Cc: David Miller
Cc: Michael Cree
LKML-Reference:
Signed-off-by: Ingo Molnar -
Changes perf_disable() into perf_pmu_disable().
Signed-off-by: Peter Zijlstra
Cc: paulus
Cc: stephane eranian
Cc: Robert Richter
Cc: Will Deacon
Cc: Paul Mundt
Cc: Frederic Weisbecker
Cc: Cyrill Gorcunov
Cc: Lin Ming
Cc: Yanmin
Cc: Deng-Cheng Zhu
Cc: David Miller
Cc: Michael Cree
LKML-Reference:
Signed-off-by: Ingo Molnar -
Simple registration interface for struct pmu, this provides the
infrastructure for removing all the weak functions.Signed-off-by: Peter Zijlstra
Cc: paulus
Cc: stephane eranian
Cc: Robert Richter
Cc: Will Deacon
Cc: Paul Mundt
Cc: Frederic Weisbecker
Cc: Cyrill Gorcunov
Cc: Lin Ming
Cc: Yanmin
Cc: Deng-Cheng Zhu
Cc: David Miller
Cc: Michael Cree
LKML-Reference:
Signed-off-by: Ingo Molnar -
sed -ie 's/const struct pmu\>/struct pmu/g' `git grep -l "const struct pmu\>"`
Signed-off-by: Peter Zijlstra
Cc: paulus
Cc: stephane eranian
Cc: Robert Richter
Cc: Will Deacon
Cc: Paul Mundt
Cc: Frederic Weisbecker
Cc: Cyrill Gorcunov
Cc: Lin Ming
Cc: Yanmin
Cc: Deng-Cheng Zhu
Cc: David Miller
Cc: Michael Cree
LKML-Reference:
Signed-off-by: Ingo Molnar
01 Sep, 2010
3 commits
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When compiling alpha generic build get errors such as:
arch/alpha/kernel/err_marvel.c: In function ‘marvel_print_err_cyc’:
arch/alpha/kernel/err_marvel.c:119: error: format ‘%ld’ expects type ‘long int’, but argument 6 has type ‘u64’Replaced a number of %ld format specifiers with %lld since u64
is unsigned long long.Signed-off-by: Michael Cree
Signed-off-by: Matt Turner -
Updates the Alpha perf_event code to match the changes
recently made to the core perf_event code in commit
e78505958cf123048fb48cb56b79cebb8edd15fb.Signed-off-by: Michael Cree
Signed-off-by: Matt Turner -
This patch fixes the failure to compile Alpha Generic because of
previously overlooked calls to ns87312_enable_ide(). The function has
been replaced by newer SuperIO code.Tested-by: Michael Cree
Signed-off-by: Morten H. Larsen
Signed-off-by: Matt Turner
29 Aug, 2010
1 commit
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Fix a comma that got accidentally deleted from sys_osf_statfs() leading to the
following warning:arch/alpha/kernel/osf_sys.c: In function 'SYSC_osf_statfs':
arch/alpha/kernel/osf_sys.c:255: error: syntax error before 'buffer'Signed-off-by: David Howells
Signed-off-by: Linus Torvalds
18 Aug, 2010
1 commit
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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
14 Aug, 2010
1 commit
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Mark arguments to certain system calls as being const where they should be but
aren't. The list includes:(*) The filename arguments of various stat syscalls, execve(), various utimes
syscalls and some mount syscalls.(*) The filename arguments of some syscall helpers relating to the above.
(*) The buffer argument of various write syscalls.
Signed-off-by: David Howells
Acked-by: David S. Miller
Signed-off-by: Linus Torvalds
11 Aug, 2010
1 commit
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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (96 commits)
no need for list_for_each_entry_safe()/resetting with superblock list
Fix sget() race with failing mount
vfs: don't hold s_umount over close_bdev_exclusive() call
sysv: do not mark superblock dirty on remount
sysv: do not mark superblock dirty on mount
btrfs: remove junk sb_dirt change
BFS: clean up the superblock usage
AFFS: wait for sb synchronization when needed
AFFS: clean up dirty flag usage
cifs: truncate fallout
mbcache: fix shrinker function return value
mbcache: Remove unused features
add f_flags to struct statfs(64)
pass a struct path to vfs_statfs
update VFS documentation for method changes.
All filesystems that need invalidate_inode_buffers() are doing that explicitly
convert remaining ->clear_inode() to ->evict_inode()
Make ->drop_inode() just return whether inode needs to be dropped
fs/inode.c:clear_inode() is gone
fs/inode.c:evict() doesn't care about delete vs. non-delete paths now
...Fix up trivial conflicts in fs/nilfs2/super.c
10 Aug, 2010
3 commits
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This implements hardware performance events for the EV67 and later CPUs
within the Linux performance events subsystem. Only using the performance
monitoring unit in HP/Compaq's so called "Aggregrate mode" is supported.The code has been implemented in a manner that makes extension to other
older Alpha CPUs relatively straightforward should some mug wish to
indulge themselves.Signed-off-by: Michael Cree
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: Matt Turner
Cc: Thomas Gleixner
Cc: Peter Zijlstra
Cc: Ingo Molnar
Cc: Jay Estabrook
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The following patches implement hardware performance events for the Alpha
EV67 and later CPUs. I have had this running on a Compaq XP1000 (EV67,
single CPU) for a few days now. Pretty cool -- discovered that the glibc
exp2() library routine uses on average 985 cycles to execute 777 CPU
instructions whereas Compaq's CPML library version of exp2() uses on
average 32 cycles to execute 47 CPU instructions to achieve the same
thing!This patch:
Add performance monitor interrupt counternd and export the count to user
space via /proc/interrupts.Signed-off-by: Michael Cree
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: Matt Turner
Cc: Thomas Gleixner
Cc: Peter Zijlstra
Cc: Ingo Molnar
Cc: Jay Estabrook
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We'll need the path to implement the flags field for statvfs support.
We do have it available in all callers except:- ecryptfs_statfs. This one doesn't actually need vfs_statfs but just
needs to do a caller to the lower filesystem statfs method.
- sys_ustat. Add a non-exported statfs_by_dentry helper for it which
doesn't won't be able to fill out the flags field later on.In addition rename the helpers for statfs vs fstatfs to do_*statfs instead
of the misleading vfs prefix.Signed-off-by: Christoph Hellwig
Signed-off-by: Al Viro
16 Jun, 2010
2 commits
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This patch probes for the Super IO chip and reserves the IO range when
found. It avoids enabling the IDE interface on the Avanti family, since
none has IDE. It enables the Enhanced Parallel Port v1.9 feature.Signed-off-by: Morten H. Larsen
Signed-off-by: Matt Turner -
Caused by 2c3c8bea608866d8bd9dcf92657d57fdcac011c5 which was clearly not
even compile tested.Signed-off-by: Matt Turner
26 May, 2010
1 commit
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Alpha has a tsc like rpcc counter that it uses to manage time.
This can be converted to an actual clocksource instead of utilizing
the arch_gettimeoffset method that is really only there for legacy
systems with no continuous counter.Further cleanups could be made if alpha converted to the clockevent
model.CC: Thomas Gleixner
CC: Richard Henderson
Acked-by: Ivan Kokshaysky
Tested-by: Ivan Kokshaysky
Signed-off-by: Matt Turner
Signed-off-by: John Stultz
22 May, 2010
1 commit
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This allows bin_attr->read,write,mmap callbacks to check file specific data
(such as inode owner) as part of any privilege validation.Signed-off-by: Chris Wright
Signed-off-by: Greg Kroah-Hartman
20 May, 2010
1 commit
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…ernel/git/tip/linux-2.6-tip
* 'timers-for-linus-cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
avr32: Fix typo in read_persistent_clock()
sparc: Convert sparc to use read/update_persistent_clock
cris: Convert cris to use read/update_persistent_clock
m68k: Convert m68k to use read/update_persistent_clock
m32r: Convert m32r to use read/update_peristent_clock
blackfin: Convert blackfin to use read/update_persistent_clock
ia64: Convert ia64 to use read/update_persistent_clock
avr32: Convert avr32 to use read/update_persistent_clock
h8300: Convert h8300 to use read/update_persistent_clock
frv: Convert frv to use read/update_persistent_clock
mn10300: Convert mn10300 to use read/update_persistent_clock
alpha: Convert alpha to use read/update_persistent_clock
xtensa: Fix unnecessary setting of xtime
time: Clean up direct xtime usage in xen