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2009-04-07tracing, x86: remove duplicated #includeHuang Weiyi
Remove duplicated #include in arch/x86/kernel/ftrace.c. Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com> LKML-Reference: <1238503291-2532-1-git-send-email-weiyi.huang@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-31Merge branches 'tracing/docs', 'tracing/filters', 'tracing/ftrace', ↵Ingo Molnar
'tracing/kprobes', 'tracing/blktrace-v2' and 'tracing/textedit' into tracing/core-v2
2009-03-25x86: kretprobe-booster interrupt emulation code fixMasami Hiramatsu
Fix interrupt emulation code in kretprobe-booster according to pt_regs update (es/ds change and gs adding). This issue has been reported on systemtap-bugzilla: http://sources.redhat.com/bugzilla/show_bug.cgi?id=9965 | On a -tip kernel on x86_32, kretprobe_example (from samples) triggers the | following backtrace when its retprobing a class of functions that cause a | copy_from/to_user(). | | BUG: sleeping function called from invalid context at mm/memory.c:3196 | in_atomic(): 0, irqs_disabled(): 1, pid: 2286, name: cat Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Tested-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Cc: systemtap-ml <systemtap@sources.redhat.com> LKML-Reference: <49C7995C.2010601@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-24function-graph: moved the timestamp from arch to generic codeSteven Rostedt
This patch move the timestamp from happening in the arch specific code into the general code. This allows for better control by the tracer to time manipulation. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-03-18ftrace: protect running nmi (V3)Lai Jiangshan
When I review the sensitive code ftrace_nmi_enter(), I found the atomic variable nmi_running does protect NMI VS do_ftrace_mod_code(), but it can not protects NMI(entered nmi) VS NMI(ftrace_nmi_enter()). cpu#1 | cpu#2 | cpu#3 ftrace_nmi_enter() | do_ftrace_mod_code() | not modify | | ------------------------|-----------------------|-- executing | set mod_code_write = 1| executing --|-----------------------|-------------------- executing | | ftrace_nmi_enter() executing | | do modify ------------------------|-----------------------|----------------- ftrace_nmi_exit() | | cpu#3 may be being modified the code which is still being executed on cpu#1, it will have undefined results and possibly take a GPF, this patch prevents it occurred. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <49C0B411.30003@cn.fujitsu.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
2009-03-18Merge branches 'tracing/ftrace' and 'linus' into tracing/coreIngo Molnar
2009-03-17prevent boosting kprobes on exception addressMasami Hiramatsu
Don't boost at the addresses which are listed on exception tables, because major page fault will occur on those addresses. In that case, kprobes can not ensure that when instruction buffer can be freed since some processes will sleep on the buffer. kprobes-ia64 already has same check. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-17Fast TSC calibration: calculate proper frequency error boundsLinus Torvalds
In order for ntpd to correctly synchronize the clocks, the frequency of the system clock must not be off by more than 500 ppm (or, put another way, 1:2000), or ntpd will end up giving up on trying to synchronize properly, and ends up reseting the clock in jumps instead. The fast TSC PIT calibration sometimes failed this test - it was assuming that the PIT reads always took about one microsecond each (2us for the two reads to get a 16-bit timer), and that calibrating TSC to the PIT over 15ms should thus be sufficient to get much closer than 500ppm (max 2us error on both sides giving 4us over 15ms: a 270 ppm error value). However, that assumption does not always hold: apparently some hardware is either very much slower at reading the PIT registers, or there was other noise causing at least one machine to get 700+ ppm errors. So instead of using a fixed 15ms timing loop, this changes the fast PIT calibration to read the TSC delta over the individual PIT timer reads, and use the result to calculate the error bars on the PIT read timing properly. We then successfully calibrate the TSC only if the maximum error bars fall below 500ppm. In the process, we also relax the timing to allow up to 25ms for the calibration, although it can happen much faster depending on hardware. Reported-and-tested-by: Jesper Krogh <jesper@krogh.cc> Cc: john stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-17Fix potential fast PIT TSC calibration startup glitchLinus Torvalds
During bootup, when we reprogram the PIT (programmable interval timer) to start counting down from 0xffff in order to use it for the fast TSC calibration, we should also make sure to delay a bit afterwards to allow the PIT hardware to actually start counting with the new value. That will happens at the next CLK pulse (1.193182 MHz), so the easiest way to do that is to just wait at least one microsecond after programming the new PIT counter value. We do that by just reading the counter value back once - which will take about 2us on PC hardware. Reported-and-tested-by: john stultz <johnstul@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-14Merge branch 'x86/asm' into tracing/syscallsIngo Molnar
We need the wider TIF work-mask checks in entry_32.S. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-14x86: entry_32.S fix compile warnings - fix work mask bit widthJaswinder Singh Rajput
Fix: arch/x86/kernel/entry_32.S:446: Warning: 00000000080001d1 shortened to 00000000000001d1 arch/x86/kernel/entry_32.S:457: Warning: 000000000800feff shortened to 000000000000feff arch/x86/kernel/entry_32.S:527: Warning: 00000000080001d1 shortened to 00000000000001d1 arch/x86/kernel/entry_32.S:541: Warning: 000000000800feff shortened to 000000000000feff arch/x86/kernel/entry_32.S:676: Warning: 0000000008000091 shortened to 0000000000000091 TIF_SYSCALL_FTRACE is 0x08000000 and until now we checked the first 16 bits of the work mask - bit 27 falls outside of that. Update the entry_32.S code to check the full 32-bit mask. [ %cx => %ecx fix from Cyrill Gorcunov <gorcunov@gmail.com> ] Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: "H. Peter Anvin" <hpa@kernel.org> LKML-Reference: <1237012693.18733.3.camel@ht.satnam> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-13tracing/syscalls: support for syscalls tracing on x86, fixIngo Molnar
Impact: build fix kernel/built-in.o: In function `ftrace_syscall_exit': (.text+0x76667): undefined reference to `syscall_nr_to_meta' ftrace.o is built: obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o But now a CONFIG_FTRACE_SYSCALLS dependency is needed too. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <1236401580-5758-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-13tracing/syscalls: support for syscalls tracing on x86Frederic Weisbecker
Extend x86 architecture syscall tracing support with syscall metadata table details. (The upcoming core syscall tracing modifications rely on this.) Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1236955332-10133-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-13tracing/x86: basic implementation of syscall tracing for x86Frederic Weisbecker
Provide the x86 trace callbacks to trace syscalls. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <1236401580-5758-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-13Merge branch 'core/locking' into tracing/ftraceIngo Molnar
2009-03-12x86: memcpy, clean upIngo Molnar
Impact: cleanup Make this file more readable by bringing it more in line with the usual kernel style. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-12x86-64: remove unnecessary spill/reload of rbx from memcpyJan Beulich
Impact: micro-optimization This should slightly improve its performance. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B8F641.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-12x86-64: move save_paranoid into .kprobes.textJan Beulich
Impact: mark save_paranoid as non-kprobe-able code This appears to be necessary as the function gets called from kprobes-unsafe exception handling stubs (i.e. which themselves live in .kprobes.text). Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B8F44F.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-12x86: remove leftover unwind annotationsJan Beulich
Impact: cleanup These got left in needlessly when ret_from_fork got simplified. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <49B8F355.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-12Merge branches 'x86/asm', 'x86/debug', 'x86/mm', 'x86/setup', 'x86/urgent' ↵Ingo Molnar
and 'linus' into x86/core
2009-03-11x86: mmiotrace: quieten spurious warning messageStuart Bennett
This message was being incorrectly emitted when using gdb, so compile it out by default for now; there will be a better fix in v2.6.30. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Stuart Bennett <stuart@freedesktop.org> Acked-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-11x86: remove zImage supportH. Peter Anvin
Impact: obsolete feature removal The zImage kernel format has been functionally unused for a very long time. It is just barely possible to build a modern kernel that still fits within the zImage size limit, but it is highly unlikely that anyone ever uses it. Furthermore, although it is still supported by most bootloaders, it has been at best poorly tested (or not tested at all); some bootloaders are even known to not support zImage at all and not having even noticed. Also remove some really obsolete constants that no longer have any meaning. LKML-Reference: <49B703D4.1000008@zytor.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-03-11x86: work around Fedora-11 x86-32 kernel failures on Intel Atom CPUsIngo Molnar
Impact: work around boot crash Work around Intel Atom erratum AAH41 (probabilistically) - it's triggering in the field. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Tested-by: Kyle McMartin <kyle@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-11x86: debug check for kmap_atomic_pfn and iomap_atomic_prot_pfn()Akinobu Mita
It may be useful for kmap_atomic_pfn() and iomap_atomic_prot_pfn() to check invalid kmap usage as well as kmap_atomic. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> LKML-Reference: <20090311143449.GB22244@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-11x86: unify kmap_atomic_pfn() and iomap_atomic_prot_pfn()Akinobu Mita
kmap_atomic_pfn() and iomap_atomic_prot_pfn() are almost same except pgprot. This patch removes the code duplication for these two functions. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> LKML-Reference: <20090311143317.GA22244@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-11x86: cpu architecture debug code, build fix, cleanupJaswinder Singh Rajput
move store_ldt outside the CONFIG_PARAVIRT section and also clean up the code a bit. Signed-off-by: Jaswinder Singh Rajput <jaswinder@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-11x86: shrink __ALIGN and __ALIGN_STR definitionsCyrill Gorcunov
Impact: cleanup 1) .p2align 4 and .align 16 are the same meaning (until a.out format for i386 is used which is not our case for CONFIG_X86_ALIGNMENT_16 anyway) 2) having 15 as max allowed bytes to be skipped does not make sense on modulo 16 Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> LKML-Reference: <20090309171951.GE9945@localhost> [ small cleanup, use __stringify(), etc. ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-11Merge branches 'x86/cleanups', 'x86/kexec', 'x86/mce2' and 'linus' into x86/coreIngo Molnar
2009-03-11x86: convert obsolete irq_desc_t typedef to struct irq_descThomas Gleixner
Impact: cleanup Convert the last remaining users. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2009-03-10x86, mce: use round_jiffies() instead round_jiffies_relative()KOSAKI Motohiro
Impact: saving power _very_ little round_jiffies() round up absolute jiffies to full second. round_jiffies_relative() round up relative jiffies to full second. The "t->expires" is absolute jiffies. Then, round_jiffies() should be used instead round_jiffies_relative(). Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-03-10x86, kexec: x86_64: add kexec jump support for x86_64Huang Ying
Impact: New major feature This patch add kexec jump support for x86_64. More information about kexec jump can be found in corresponding x86_32 support patch. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-03-10x86, kexec: x86_64: add identity map for pages at image->startHuang Ying
Impact: Fix corner case that cannot yet occur image->start may be outside of 0 ~ max_pfn, for example when jumping back to original kernel from kexeced kenrel. This patch add identity map for pages at image->start. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-03-10x86, kexec: fix kexec x86 coding styleHuang Ying
Impact: Cleanup Fix some coding style issue for kexec x86. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-03-10Merge branches 'tracing/ftrace', 'tracing/textedit' and 'linus' into ↵Ingo Molnar
tracing/core
2009-03-10Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86 mmiotrace: fix remove_kmmio_fault_pages()
2009-03-10x86: cpu architecture debug codeJaswinder Singh Rajput
Introduce: cat /sys/kernel/debug/x86/cpu/* for Intel and AMD processors to view / debug the state of each CPU. By using this we can debug whole range of registers and other cpu information for debugging purpose and monitor how things are changing. This can be useful for developers as well as for users. Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> LKML-Reference: <1236701373.3387.4.camel@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-10x86: expand irq-off region in text_poke()Masami Hiramatsu
Expand irq-off region to cover fixmap using code and cache synchronizing. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <49B54688.8090403@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-10Merge branch 'x86/core' into tracing/ftraceIngo Molnar
Semantic merge: kernel/trace/trace_functions_graph.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-10Merge branches 'tracing/doc', 'tracing/ftrace', 'tracing/printk' and 'linus' ↵Ingo Molnar
into tracing/core
2009-03-10x86: BUG to BUG_ON changesStoyan Gaydarov
Impact: cleanup Signed-off-by: Stoyan Gaydarov <stoyboyker@gmail.com> LKML-Reference: <1236661850-8237-8-git-send-email-stoyboyker@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-10Merge branches 'x86/apic', 'x86/asm', 'x86/fixmap', 'x86/memtest', 'x86/mm', ↵Ingo Molnar
'x86/urgent', 'linus' and 'core/percpu' into x86/core
2009-03-09Merge branch 'fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] Add p4-clockmod sysfs-ui removal to feature-removal schedule. Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod."
2009-03-09Revert "[CPUFREQ] Disable sysfs ui for p4-clockmod."Dave Jones
This reverts commit e088e4c9cdb618675874becb91b2fd581ee707e6. Removing the sysfs interface for p4-clockmod was flagged as a regression in bug 12826. Course of action: - Find out the remaining causes of overheating, and fix them if possible. ACPI should be doing the right thing automatically. If it isn't, we need to fix that. - mark p4-clockmod ui as deprecated - try again with the removal in six months. It's not really feasible to printk about the deprecation, because it needs to happen at all the sysfs entry points, which means adding a lot of strcmp("p4-clockmod".. calls to the core, which.. bleuch. Signed-off-by: Dave Jones <davej@redhat.com>
2009-03-09lguest: fix for CONFIG_SPARSE_IRQ=yRusty Russell
Impact: remove lots of lguest boot WARN_ON() when CONFIG_SPARSE_IRQ=y We now need to call irq_to_desc_alloc_cpu() before set_irq_chip_and_handler_name(), but we can't do that from init_IRQ (no kmalloc available). So do it as we use interrupts instead. Also means we only alloc for irqs we use, which was the intent of CONFIG_SPARSE_IRQ anyway. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Ingo Molnar <mingo@redhat.com>
2009-03-09lguest: fix crash 'unhandled trap 13 at <native_read_msr_safe>'Rusty Russell
Impact: fix lguest boot crash on modern Intel machines The code in early_init_intel does: if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) { u64 misc_enable; rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable); And that rdmsr faults (not allowed from non-0 PL). We can get around this by mugging the family ID part of the cpuid. 5 seems like a good number. Of course, this is a hack (how very lguest!). We could just indicate that we don't support MSRs, or implement lguest_rdmst. Reported-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Tested-by: Patrick McHardy <kaber@trash.net>
2009-03-08x86-32: make sure virt_addr_valid() returns false for fixmap addressesJeremy Fitzhardinge
I found that virt_addr_valid() was returning true for fixmap addresses. I'm not sure whether pfn_valid() is supposed to include this test, but there's no harm in being explicit. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Jiri Slaby <jirislaby@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <49B166D6.2080505@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-08x86 mmiotrace: fix remove_kmmio_fault_pages()Stuart Bennett
Impact: fix race+crash in mmiotrace The list manipulation in remove_kmmio_fault_pages() was broken. If more than one consecutive kmmio_fault_page was re-added during the grace period between unregister_kmmio_probe() and remove_kmmio_fault_pages(), the list manipulation failed to remove pages from the release list. After a second grace period the pages get into rcu_free_kmmio_fault_pages() and raise a BUG_ON() kernel crash. The list manipulation is fixed to properly remove pages from the release list. This bug has been present from the very beginning of mmiotrace in the mainline kernel. It was introduced in 0fd0e3da ("x86: mmiotrace full patch, preview 1"); An urgent fix for Linus. Tested by Stuart (on 32-bit) and Pekka (on amd and intel 64-bit systems, nouveau and nvidia proprietary). Signed-off-by: Stuart Bennett <stuart@freedesktop.org> Signed-off-by: Pekka Paalanen <pq@iki.fi> LKML-Reference: <20090308202135.34933feb@daedalus.pq.iki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-08x86: fix warning about nodeidYinghai Lu
Impact: cleanup Ingo found there warning about nodeid with some configs. try to use for_each_online_node for non numa too. in that case nodeid will be 0. also move out boundary checking from setup_node_bootmem(), so non-numa config will not check it. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <49B03069.80001@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-08x86: don't define __this_fixmap_does_not_exist()Wang Chen
Impact: improve out-of-range fixmap index debugging Commit "1b42f51630c7eebce6fb780b480731eb81afd325" defined the __this_fixmap_does_not_exist() function with a WARN_ON(1) in it. This causes the linker to not report an error when __this_fixmap_does_not_exist() is called with a non-constant parameter. Ingo defined __this_fixmap_does_not_exist() because he wanted to get virt addresses of fix memory of nest level by non-constant index. But we can fix this and still keep the link-time check: We can get the four slot virt addresses on link time and store them to array slot_virt[]. Then we can then refer the slot_virt with non-constant index, in the ioremap-leak detection code. Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com> LKML-Reference: <49B2075B.4070509@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-08x86: remove smp_apply_quirks()/smp_checks()Yinghai Lu
Impact: cleanup and code size reduction on 64-bit This code is only applied to Intel Pentium and AMD K7 32-bit cpus. Move those checks to intel_init()/amd_init() for 32-bit so 64-bit will not build this code. Also change to use cpu_index check to see if we need to emit warning. Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <49B377D2.8030108@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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