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2009-10-28powerpc: Export powerpc_debugfs_rootAnton Blanchard
Kernel modules should be able to place their debug output inside our powerpc debugfs directory. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: Disable HCALL_STATS by defaultAnton Blanchard
The overhead of HCALL_STATS is quite high and the functionality is very rarely used. Key statistics are also missing (eg min/max). With the new hcall tracepoints much more powerful tracing can be done in a kernel module. Lets disable this by default. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: tracing: Give hypervisor call tracepoints access to argumentsAnton Blanchard
While most users of the hcall tracepoints will only want the opcode and return code, some will want all the arguments. To avoid the complexity of using varargs we pass a pointer to the register save area, which contains all the arguments. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: tracing: Add hypervisor call tracepointsAnton Blanchard
Add hcall_entry and hcall_exit tracepoints. This replaces the inline assembly HCALL_STATS code and converts it to use the new tracepoints. To keep the disabled case as quick as possible, we embed a status word in the TOC so we can get at it with a single load. By doing so we keep the overhead at a minimum. Time taken for a null hcall: No tracepoint code: 135.79 cycles Disabled tracepoints: 137.95 cycles For reference, before this patch enabling HCALL_STATS resulted in a null hcall of 201.44 cycles! Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: tracing: Add powerpc tracepoints for timer entry and exitAnton Blanchard
We can monitor the effectiveness of our power management of both the kernel and hypervisor by probing the timer interrupt. For example, on this box we see 10.37s timer interrupts on an idle core: <idle>-0 [010] 3900.671297: timer_interrupt_entry: pt_regs=c0000000ce1e7b10 <idle>-0 [010] 3900.671302: timer_interrupt_exit: pt_regs=c0000000ce1e7b10 <idle>-0 [010] 3911.042963: timer_interrupt_entry: pt_regs=c0000000ce1e7b10 <idle>-0 [010] 3911.042968: timer_interrupt_exit: pt_regs=c0000000ce1e7b10 <idle>-0 [010] 3921.414630: timer_interrupt_entry: pt_regs=c0000000ce1e7b10 <idle>-0 [010] 3921.414635: timer_interrupt_exit: pt_regs=c0000000ce1e7b10 Since we have a 207MHz decrementer it will go negative and fire every 10.37s even if Linux is completely idle. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: tracing: Add powerpc tracepoints for interrupt entry and exitAnton Blanchard
This adds powerpc-specific tracepoints for interrupt entry and exit. While we already have generic irq_handler_entry and irq_handler_exit tracepoints there are cases on our virtualised powerpc machines where an interrupt is presented to the OS, but subsequently handled by the hypervisor. This means no OS interrupt handler is invoked. Here is an example on a POWER6 machine with the patch below applied: <idle>-0 [006] 3243.949840744: irq_entry: pt_regs=c0000000ce31fb10 <idle>-0 [006] 3243.949850520: irq_exit: pt_regs=c0000000ce31fb10 <idle>-0 [007] 3243.950218208: irq_entry: pt_regs=c0000000ce323b10 <idle>-0 [007] 3243.950224080: irq_exit: pt_regs=c0000000ce323b10 <idle>-0 [000] 3244.021879320: irq_entry: pt_regs=c000000000a63aa0 <idle>-0 [000] 3244.021883616: irq_handler_entry: irq=87 handler=eth0 <idle>-0 [000] 3244.021887328: irq_handler_exit: irq=87 return=handled <idle>-0 [000] 3244.021897408: irq_exit: pt_regs=c000000000a63aa0 Here we see two phantom interrupts (no handler was invoked), followed by a real interrupt for eth0. Without the tracepoints in this patch we would have missed the phantom interrupts. Signed-off-by: Anton Blanchard <anton@samba.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: perf_event: Add alignment-faults and emulation-faults software eventsAnton Blanchard
Hook up the alignment-faults and emulation-faults events for powerpc. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: Create PPC_WARN_ALIGNMENT to match PPC_WARN_EMULATEDAnton Blanchard
perf_event wants a separate event for alignment and emulation faults, so create another emulation event. This will make it easy to hook in perf_event at one spot. We pass in regs which will be required for these events. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: perf_event: Enable SDAR in continous sample modeAnton Blanchard
In continuous sampling mode we want the SDAR to update. While we can select between dcache misses and ERAT (L1-TLB) misses, a decent default is to enable both. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-28powerpc: perf_event: Log invalid data addresses as all 1sAnton Blanchard
When we take an exception and the SDAR isn't synchronised we currently log 0 as the address. Unfortunately this is a pretty common value, so use ~0UL instead. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
2009-10-27Merge commit 'gcl/merge' into mergeBenjamin Herrenschmidt
2009-10-27powerpc/ppc64: Use preempt_schedule_irq instead of preempt_scheduleBenjamin Herrenschmidt
Based on an original patch by Valentine Barshak <vbarshak@ru.mvista.com> Use preempt_schedule_irq to prevent infinite irq-entry and eventual stack overflow problems with fast-paced IRQ sources. This kind of problems has been observed on the PASemi Electra IDE controller. We have to make sure we are soft-disabled before calling preempt_schedule_irq and hard disable interrupts after that to avoid unrecoverable exceptions. This patch also moves the "clrrdi r9,r1,THREAD_SHIFT" out of the #ifdef CONFIG_PPC_BOOK3E scope, since r9 is clobbered and has to be restored in both cases. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc: Fix compile errors found by new ppc64e_defconfigKumar Gala
Fix the following 3 issues: arch/powerpc/kernel/process.c: In function 'arch_randomize_brk': arch/powerpc/kernel/process.c:1183: error: 'mmu_highuser_ssize' undeclared (first use in this function) arch/powerpc/kernel/process.c:1183: error: (Each undeclared identifier is reported only once arch/powerpc/kernel/process.c:1183: error: for each function it appears in.) arch/powerpc/kernel/process.c:1183: error: 'MMU_SEGSIZE_1T' undeclared (first use in this function) In file included from arch/powerpc/kernel/setup_64.c:60: arch/powerpc/include/asm/mmu-hash64.h:132: error: redefinition of 'struct mmu_psize_def' arch/powerpc/include/asm/mmu-hash64.h:159: error: expected identifier or '(' before numeric constant arch/powerpc/include/asm/mmu-hash64.h:396: error: conflicting types for 'mm_context_t' arch/powerpc/include/asm/mmu-book3e.h:184: error: previous declaration of 'mm_context_t' was here cc1: warnings being treated as errors arch/powerpc/kernel/pci_64.c: In function 'pcibios_unmap_io_space': arch/powerpc/kernel/pci_64.c:100: error: unused variable 'res' Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc: Add a Book-3E 64-bit defconfigKumar Gala
This defconfig's purpose at this time is to help catch compile errors between Book-3S and Book-3E support in ppc64. It is based on the ppc64_defconfig with some things disabled that we dont support on Book-3E right now (hugetlbfs, slices, etc.) Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc/booke: Fix xmon single step on PowerPC Book-EJosh Boyer
Prior to the arch/ppc -> arch/powerpc transition, xmon had support for single stepping on 4xx boards. The functionality was lost when arch/ppc was removed. This patch restores single step support for 44x boards, and Book-E in general. Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc: Align vDSO base addressAndreas Schwab
The ABI specifies a 64K alignment, we need to map the vDSO accordingly Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc: Fix segment mapping in vdso32Andreas Schwab
Due to missing segment assignments the .text section was put in the NOTES segment (and marked as NOTE section), and the .got was put in the DYNAMIC segment. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc/iseries: Remove compiler version dependent hackStephen Rothwell
The creation of the flattened device tree depended on the compiler putting the constant strings for an object in a section with a particular name. This was changed with recent compilers. Do this explicitly instead. Without this patch, iseries kernels may silently not boot when built with some compilers. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-27powerpc/perf_events: Fix priority of MSR HV vs PR bitsMichael Neuling
The architecture defines that if MSR PR is set we are in problem state irrespective of the HV bit. This fixes perf events to reflect this. Also, on bare metal systems, samples taken in Linux will now be reported as kernel rather than hypervisor. Signed-off-by: Michael Neuling <mikey@neuling.org> CC: paulus@samba.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-15of: merge of_find_all_nodes() implementationsGrant Likely
Merge common code between Microblaze and PowerPC, and make it available to Sparc Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge other miscellaneous prototypesGrant Likely
Merge common prototypes used by Microblaze and PowerPC Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge of_*_flat_dt*() functionsGrant Likely
Merge common flattened device tree code between Microblaze and PowerPC Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge of_node_get(), of_node_put() and of_find_all_nodes()Grant Likely
Merge common code between Sparc, PowerPC and Microblaze. Sparc differs in the implementation at this point, so this patch uses a #ifdef to handle sparc differently for now. The merging of implementations will occur in a later patch Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge of_read_number() an of_read_ulong()Grant Likely
Merge common code between Microblaze and PowerPC Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge of_node_*_flag() and set_node_proc_entry()Grant Likely
Merge common code between PowerPC and Microblaze Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge struct boot_param_header from Microblaze and PowerPCGrant Likely
Merge common code for working with Flattened Device Tree data structure Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: add common header for flattened device tree representationGrant Likely
Add a common header file for working with the flattened device tree data structure and merge the shared data tags used by Microblaze and PowerPC Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge struct device_nodeGrant Likely
Merge of common code duplicated between Sparc, PowerPC and Microblaze Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: merge phandle, ihandle and struct propertyGrant Likely
Merge of common code duplicated between Sparc, PowerPC and Microblaze Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15of: Rework linux/of.h and asm/prom.h include orderingGrant Likely
In preparation to prune things out of the Sparc, PowerPC and Microblaze asm/prom.h files, change the #include statements to ensure that even if asm/prom.h is included first, linux/of.h gets to determine the order in which files are processed. This patch adds a #include <linux/of.h> to each of the prom.h files *above* the multi-include protection macros to ensure that linux/of.h can define things before prom.h gets processed. At the end of the merge the cross dependencies between the files should be gone and a sane #include scheme can be restored. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Michal Simek <monstr@monstr.eu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
2009-10-15powerpc/5200: Update defconfigsGrant Likely
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-10-15powerpc/boot/dts: drop obsolete 'fsl5200-clocking'Wolfram Sang
The 'fsl5200-clocking'-property was dropped since 0d1cde235874b00905bce23f659690d060ebf475. Remove all occurences in dts-files. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-10-15mpc5200: support for the MAN mpc5200 based board mucmc52Heiko Schocher
- serial Console on PSC1 - 64MB SDRAM - MTD CFI Flash - Ethernet FEC - IDE support Signed-off-by: Heiko Schocher <hs@denx.de> Reviewed-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-10-15mpc5200: support for the MAN mpc5200 based board uc101Heiko Schocher
- serial Console on PSC1 - 64MB SDRAM - MTD CFI Flash - Ethernet FEC - I2C with PCF8563 and Temp. Sensor ADM9240 - IDE support Signed-off-by: Heiko Schocher <hs@denx.de> Reviewed-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-10-15Merge commit 'ftrace/ppc' into mergeBenjamin Herrenschmidt
2009-10-14powerpc/pci: Fix MODPOST warningHeiko Schocher
making a powerpc target with PCI support, shows the following warning: MODPOST vmlinux.o WARNING: vmlinux.o(.text+0x10430): Section mismatch in reference from the function pcibios_allocate_bus_resources() to the function .init.text:reparent_resources() The function pcibios_allocate_bus_resources() references the function __init reparent_resources(). This is often because pcibios_allocate_bus_resources lacks a __init annotation or the annotation of reparent_resources is wrong. This patch fix this warning by removing the __init annotation before reparent_resources. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc/oprofile: Add ppc750 CL as supported by oprofileDragos Tatulea
Here's a patch that adds the ppc750 CL cpu as supported by oprofile. Signed-off-by: Dragos Tatulea <dtatulea@ixiacom.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc: warning: allocated section `.data_nosave' not in segmentSean MacLennan
We need to align before the output section. Having the align inside the output section causes the linker to put some filler in there, which makes it a non-empty section, but this section isn't assigned to a segment so you get a warning from the linker. Signed-off-by: Sean MacLennan <smaclennan@pikatech.com> Acked-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc/kgdb: Fix build failure caused by "kgdb.c: unused variable 'acc'"Anton Vorontsov
'acc' isn't used anywhere and thus triggers gcc warning, which causes build error with CONFIG_PPC_DISABLE_WERROR=n (default): cc1: warnings being treated as errors arch/powerpc/kernel/kgdb.c: In function 'gdb_regs_to_pt_regs': arch/powerpc/kernel/kgdb.c:289: warning: unused variable 'acc' make[1]: *** [arch/powerpc/kernel/kgdb.o] Error 1 Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc: Fix hypervisor TLB batchingAnton Blanchard
Profiling of a page fault scalability microbenchmark shows flush_hash_range is not calling the batch hpte invalidate hcall (H_BULK_REMOVE). It turns out we have a duplicate firmware feature for hcall-bulk and the current setup code stops after finding the first match. This meant we never batch and always do individual invalidates. The patch below removes the duplicate and shifts FW_FEATURE_CMO to close the gap. With the patch applied the single threaded page fault rate improves from 217169 to 238755 per second on a POWER5 test box, a 10% improvement. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc/mm: Fix hang accessing top of vmalloc spaceBenjamin Herrenschmidt
On pSeries, we always force the IO space to be mapped using 4K pages even with a 64K base page size to cope with some limitations in the HV interface to some devices. However, the SLB miss handler code to discriminate between vmalloc and ioremap space uses a CPU feature section such that the code is nop'ed out when the processor support large pages non-cachable mappings. Thus, we end up always using the ioremap page size for vmalloc segments on such processors, causing a discrepency between the segment and the hash table, and thus a hang continously hashing the page. It works for the first segment of the vmalloc space since that segment is "bolted" in by C code correctly, and thankfully we almost never use the vmalloc space beyond the first segment, but the new percpu code made the bug happen. This fixes it by removing the feature section from the assembly, we now always do the comparison between vmalloc and ioremap. Signed-off-by; Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc: Fix memory leak in axon_msi.cMichael Ellerman
cppcheck found a memory leak in axon_msi, if dcr_base or dcr_len are zero, we have already allocated msic, so we should free it in the error path. Signed-off-by: Eric Sesterhenn <eric.sesterhenn@lsexperts.de> Acked-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-14powerpc/pmac: Fix issues with sleep on some powerbooksBenjamin Herrenschmidt
Since the change of how interrupts are disabled during suspend, certain PowerBook models started exhibiting various issues during suspend or resume from sleep. I finally tracked it down to the code that runs various "platform" functions (kind of little scripts extracted from the device-tree), which uses our i2c and PMU drivers expecting interrutps to work, and at a time where with the new scheme, they have been disabled. This causes timeouts internally which for some reason results in the PMU being unable to see the trackpad, among other issues, really it depends on the machine. Most of the time, we fail to properly adjust some clocks for suspend/resume so the results are not always predictable. This patch fixes it by using IRQF_TIMER for both the PMU and the I2C interrupts. I prefer doing it this way than moving the call sites since I really want those platform functions to still be called after all drivers (and before sysdevs). We also do a slight cleanup to via-pmu.c driver to make sure the ADB autopoll mask is handled correctly when doing bus resets Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-10-13powerpc64/ftrace: use PACA to retrieve TOC in mod_return_to_handlerSteven Rostedt
The mod_return_to_handler needs to switch to the kernel TOC before jumping to a the kernel code. It currently does this by looking at the kernel function data and retrieves the TOC that way. Not only is this inefficient, it also breaks with a relocatable kernel. The PACA contains the kernel TOC and we can easily retrieve it that way. Reported-by: Sachin Sant <sachinp@in.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-10-13powerpc/ftrace: show real return addresses in modulesSteven Rostedt
When the function graph tracer is enabled, it replaces the return address with a hook back to the tracer. This makes back traces see the hook instead of the actual return address. The current code also shows the real address by checking if the return address jumps to the return_to_handler. If it is, is also prints out the saved real return address. On powerpc64, some modules may return to mod_return_to_handler, which is not checked. This patch will also show the real address if a return is to mod_return_to_handler as well. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2009-10-12net: Generalize socket rx gap / receive queue overflow cmsgNeil Horman
Create a new socket level option to report number of queue overflows Recently I augmented the AF_PACKET protocol to report the number of frames lost on the socket receive queue between any two enqueued frames. This value was exported via a SOL_PACKET level cmsg. AFter I completed that work it was requested that this feature be generalized so that any datagram oriented socket could make use of this option. As such I've created this patch, It creates a new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue overflowed between any two given frames. It also augments the AF_PACKET protocol to take advantage of this new feature (as it previously did not touch sk->sk_drops, which this patch uses to record the overflow count). Tested successfully by me. Notes: 1) Unlike my previous patch, this patch simply records the sk_drops value, which is not a number of drops between packets, but rather a total number of drops. Deltas must be computed in user space. 2) While this patch currently works with datagram oriented protocols, it will also be accepted by non-datagram oriented protocols. I'm not sure if thats agreeable to everyone, but my argument in favor of doing so is that, for those protocols which aren't applicable to this option, sk_drops will always be zero, and reporting no drops on a receive queue that isn't used for those non-participating protocols seems reasonable to me. This also saves us having to code in a per-protocol opt in mechanism. 3) This applies cleanly to net-next assuming that commit 977750076d98c7ff6cbda51858bb5a5894a9d9ab (my af packet cmsg patch) is reverted Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-01const: constify remaining file_operationsAlexey Dobriyan
[akpm@linux-foundation.org: fix KVM] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-27const: mark struct vm_struct_operationsAlexey Dobriyan
* mark struct vm_area_struct::vm_ops as const * mark vm_ops in AGP code But leave TTM code alone, something is fishy there with global vm_ops being used. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-25Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: Fix build of cpm_uart due to core changes powerpc/8xx: Fix regression introduced by cache coherency rewrite powerpc/4xx: Fix erroneous xmon warning on PowerPC 4xx powerpc/mm: Fix 40x and 8xx vs. _PAGE_SPECIAL powerpc: Cleanup linker script using new linker script macros. powerpc: Fix ibm,client-architecture-support printout powerpc: Increase NODES_SHIFT on 64bit from 4 to 8 powerpc/perf_counter: Fix vdso detection powerpc: Move 64bit heap above 1TB on machines with 1TB segments powerpc: Change archdata dma_data to a union powerpc: Rename get_dma_direct_offset get_dma_offset powerpc/mm: Remove duplicated #include powerpc/book3e-64: Remove duplicated #include powerpc: Check for unsupported relocs when using CONFIG_RELOCATABLE powerpc/pmc: Don't access lppaca on Book3E powerpc: kmalloc failure ignored in vio_build_iommu_table() hvc_console: Provide (un)locked version for hvc_resize()
2009-09-25powerpc: Cleanup linker script using new linker script macros.Tim Abbott
Signed-off-by: Tim Abbott <tabbott@ksplice.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@ozlabs.org Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>