| Commit message (Collapse) | Author | Age | Files | Lines |
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Add ftrace warn on to disable ftrace as well as report a warning.
[ Thanks to Andrew Morton for suggesting using the WARN_ON return value ]
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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When an anomaly is detected, we need a way to completely disable
ftrace. Right now we have two functions: ftrace_kill and ftrace_kill_atomic.
The ftrace_kill tries to do it in a "nice" way by converting everything
back to a nop.
The "nice" way is dangerous itself, so this patch removes it and only
has the "atomic" version, which is all that is needed.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Andrew Morton suggested using the proper API for reading and writing
kernel areas that might fault.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Add comments to explain what is happening in the x86 arch ftrace code.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Have the ftrace_modify_code return error values:
-EFAULT on error of reading the address
-EINVAL if what is read does not match what it expected
-EPERM if the write fails to update after a successful match.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The text section stays in memory without ever leaving. With the exception
of modules, but modules know how to handle that case. With the dynamic
ftrace tracer, we need to make sure that it does not try to modify code
that no longer exists. The only safe section is .text.
This patch changes the recordmcount script to only record the mcount calls
in the .text sections.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The recordmcount script requires that the actual arch is passed in.
This works well when ARCH=i386 or ARCH=x86_64 but does not handle the
case of ARCH=x86.
This patch adds a parameter to the function to pass in the number of
bits of the architecture. So that it can determine if x86 should be
run for x86_64 or i386 archs.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The pages of a buffer was originally pointing to the page struct, it
now points to the page address. The freeing of the page still uses
the page frame free "__free_page" instead of the correct free_page to
the address.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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When bootgraph.pl parses a file, it gives one row for each initcall's
pid. But they are displayed in random (perl hash) order. Let's
sort the pids by the start time of their first initcall instead.
This helps trace module initcalls, where each has a separate pid.
bootgraph.pl will show module initcalls during the initramfs; it may
also be adapted to show subsequent module initcalls.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Acked-by: Frédéric Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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As a perl novice, I would prefer to have the benefit of the interpreters'
wisdom. It turns out there were already some warnings, so let's fix them.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Acked-by: Frédéric Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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We seem to have plenty tracers, lets create a menu and not clutter
the already cluttered debug menu more.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Frédéric Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The stack trace API does not record if the stack is not on the current
task's stack. That is, if the stack is the interrupt stack or NMI stack,
the output does not show. Also, the size of those stacks are not
consistent with the size of the thread stack, this makes the calculation
of the stack size usually bogus.
This all confuses the stack tracer. I unfortunately do not have time to
fix all these problems, but this patch does record the worst stack when
the stack pointer is on the tasks stack (instead of bogus numbers).
The patch simply returns if the stack pointer is not on the task's stack.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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To avoid further confusion between the ftrace infrastructure and the
function tracer. This patch renames the "ftrace" function tracer
to "function".
Now in available_tracers, instead of "ftrace" there will be "function".
This makes more sense, since people will not know exactly what the
"ftrace" tracer does.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Due to confusion between the ftrace infrastructure and the gcc profiling
tracer "ftrace", this patch renames the config options from FTRACE to
FUNCTION_TRACER. The other two names that are offspring from FTRACE
DYNAMIC_FTRACE and FTRACE_MCOUNT_RECORD will stay the same.
This patch was generated mostly by script, and partially by hand.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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A lot of tracers have HAVE_FTRACE as a dependent config where it
really should not. The HAVE_FTRACE is a misnomer (soon to be fixed)
and describes if the architecture has the function tracer (mcount)
implemented. The ftrace infrastructure is implemented in all archs.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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The x86 architecture uses a static recording of mcount caller locations
and is not affected by this patch.
For architectures still using the dynamic ftrace daemon, this patch is
critical. It removes the race between the recording of a function that
calls mcount, the unloading of a module, and the ftrace daemon updating
the call sites.
This patch adds the releasing of the hash functions that the daemon uses
to update the mcount call sites. When a module is unloaded, not only
are the replaced call site table update, but now so is the hash recorded
functions that the ftrace daemon will use.
Again, architectures that implement MCOUNT_RECORD are not affected by
this (which currently only x86 has).
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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In ftrace, logic is defined in the WARN_ON_ONCE, which can become a
nop with some configs. This patch fixes it.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Conflicts:
init/main.c
kernel/module.c
scripts/bootgraph.pl
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Commit f06febc96ba8e0af80bcc3eaec0a109e88275fac ("timers: fix itimer/
many thread hang") introduced a new task_cputime interface and
subsequently only converted binfmt_elf over to it. This results in the
build for binfmt_elf_fdpic blowing up given that p->signal->{u,s}time
have disappeared from underneath us.
Apply the same trivial fix from binfmt_elf to binfmt_elf_fdpic.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Removed duplicated #include <linux/vmalloc.h> in mm/vmalloc.c and
"internal.h" in mm/memory.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We're trying to keep the !CONFIG_SHMEM tiny-shmem.c (using ramfs without
swap) in synch with CONFIG_SHMEM shmem.c (and mpm is preparing patches
to combine them). I was glad to see EXPORT_SYMBOL_GPL(shmem_file_setup)
go into shmem.c, but why not support DRM-GEM when !CONFIG_SHMEM too?
But caution says still depend on MMU, since !CONFIG_MMU is.. different.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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__FUNCTION__ is gcc-specific, use __func__
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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commit 9b7530cc329eb036cfa589930c270e85031f554c ("i915: cleanup coding
horrors in i915_gem_gtt_pwrite()")
broke the i386 build for CONFIG_HIGHMEM=y.
Caught by automatic testing http://www.tglx.de/autoqa-logs/000137-0006-0001.log
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ My bad. It's the same patch I sent out earlier, nobody noticed then either.. ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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powerpc doesn't use the generic WARN_ON infrastructure. The newly
introduced WARN() as a result didn't print the message, this patch adds
the printk for this specific case.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This fixes
kernel/kexec.c: In function 'crash_save_vmcoreinfo_init':
kernel/kexec.c:1374: error: 'vmlist' undeclared (first use in this function)
kernel/kexec.c:1374: error: (Each undeclared identifier is reported only once
kernel/kexec.c:1374: error: for each function it appears in.)
kernel/kexec.c:1410: error: invalid use of undefined type 'struct vm_struct'
make[1]: *** [kernel/kexec.o] Error 1
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6:
parisc: convert to generic compat_sys_ptrace
parisc: add rtc platform driver
parisc: initialize unwinder much earlier
parisc: add new syscalls
parisc: hijack jump to start_kernel
parisc: add pdc_coproc_cfg_unlocked and set_firmware_width_unlocked
parisc: move include/asm-parisc to arch/parisc/include/asm
parisc: move pdc_result to real2.S
parisc: unify CCIO_COLLECT_STATS implementation
parisc: add arch/parisc/kernel/.gitignore
parisc: ropes.h - fix <asm-parisc/*> -> <asm/*>
parisc: parisc-agp - fix <asm-parisc/*> -> <asm/*>
Resolve remove/rename conflict: include/asm-parisc/a.out.h is no longer
relevant.
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This patch does the compat_sys_ptrace conversion for parisc.
In addition it does convert the parisc ptrace code to use the
architecture-independent ptrace infrastructure instead of own coding.
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
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Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
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The unwinder was being initialized way too late to be any use
debugging early boot crashes. Instead of relying on module_init
initcalls to initialize it, let's do it explicitly as early as
we can.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
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Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
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Bang in our own start_parisc call, which initializes the PDC
width, and turns on the FPU.
Previously, if CONFIG_PRINTK_TIME was on, we'd attempt to use
the FPU before we had enabled it, resulting in a difficult
to diagnose panic.
This patch causes init_per_cpu to redundantly set these for
cpu0, but this is harmless.
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These functions are called only when bringing up the monarch cpu,
so it is safe to call them without taking the pdc spinlock. In the
future, this may become relevant for lockdep, since these functions were
taking spinlocks before start_kernel called the lockdep initializers.
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Make it behave in the same manner as SBA_COLLECT_STATS, further
clean ups pending.
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This gets rid of an annoying warning in ehci-hcd.c when DEBUG isn't
enabled:
warning: label 'err_debug' defined but not used
by moving it inside the already-existing #ifdef DEBUG, so that it
matches the goto. And now my regular build is warning-free again.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Yes, this will probably be switched over to a cleaner model anyway, but
in the meantime I don't want to see the 'unused variable' warnings that
come from the disgusting #ifdef code. Make the special case be a nice
inlien function of its own, clean up the code, and make the warning go
away.
I wish people didn't write code that gets (valid) warnings from the
compiler, but I'll limit my fixes to code that I actually care about (in
this case just because I see the warning and it annoys me).
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Use "%zd" for size_t, and make sure to have a space between the numbers
instead of depending on the field width.
I don't like warnings in my default targeted build.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* 'bkl-removal' of git://git.lwn.net/linux-2.6:
UIO: BKL removal
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Fill in needed locking around idr accesses, then remove the big kernel lock
from the UIO driver. Since there are no in-tree UIO drivers with open()
methods, no further BKL pushdown is required.
Acked-by: Hans J. Koch <hjk@linutronix.de>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (41 commits)
PCI: fix pci_ioremap_bar() on s390
PCI: fix AER capability check
PCI: use pci_find_ext_capability everywhere
PCI: remove #ifdef DEBUG around dev_dbg call
PCI hotplug: fix get_##name return value problem
PCI: document the pcie_aspm kernel parameter
PCI: introduce an pci_ioremap(pdev, barnr) function
powerpc/PCI: Add legacy PCI access via sysfs
PCI: Add ability to mmap legacy_io on some platforms
PCI: probing debug message uniformization
PCI: support PCIe ARI capability
PCI: centralize the capabilities code in probe.c
PCI: centralize the capabilities code in pci-sysfs.c
PCI: fix 64-vbit prefetchable memory resource BARs
PCI: replace cfg space size (256/4096) by macros.
PCI: use resource_size() everywhere.
PCI: use same arg names in PCI_VDEVICE comment
PCI hotplug: rpaphp: make debug var unique
PCI: use %pF instead of print_fn_descriptor_symbol() in quirks.c
PCI: fix hotplug get_##name return value problem
...
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s390 doesn't have ioremap_*, so protect the definition of the new
pci_ioremap_bar function with CONFIG_HAS_IOMEM to avoid build breakage.
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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The 'use pci_find_ext_capability everywhere' cleanup brought a new bug,
which makes the AER stop working. Fix it by actually using find_ext_cap
instead of just find_cap. Drop the unused config space size define while
we're at it.
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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Remove some open coded (and buggy) versions of pci_find_ext_capability
in favor of the real routine in the PCI core.
Tested-by: Tomasz Czernecki <czernecki@gmail.com>
Acked-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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No longer needed since we don't use the function symbol stuff anymore.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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The commit 356a9d6f3dd283f83861adf1ac909879f0e66411 (PCI: fix hotplug
get_##name return value problem) doesn't seem to be merged properly.
Because of this, PCI hotplug no longer works (Read/Write PCI hotplug
files always returns -ENODEV).
This patch fixes wrong check of try_module_get() return value check in
get_##name().
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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