- 31 Aug, 2004 40 commits
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Brian Gerst authored
The last attempt to clean this up still left a hardcoded constant (the offset from __FIXADDR_TOP). This patch moves VSYSCALL_BASE to asm-offsets.c. Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Joshua Kwan authored
Cc: William Lee Irwin III <wli@holomorphy.com> Signed-off-by:
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Andrew Morton authored
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Ryan S. Arnold authored
This is an hvc_console patch which provides driver and ppc64 architecture fixes to enable the hvc_console driver to register itself as a vio device with the vio bus, provide hotplug add/remove for vty adapters, and act as an interrupt driven driver on Power-5 hardware or remain as a polling driver on Power-4 hardware. arch/ppc64/kernel/hvconsole.c ============================= - Changed hvc_get_chars() and hvc_put_chars() api to take vtermno rather than index number. - Added hvc_find_vtys() function which walks the bus looking for vterm/vty devices to callback to the hvc_console driver. This provides console output functionality prior to early console init (pre mem init and pre device probe). include/asm-ppc64/hvconsole.h ============================= - Changed hvc_get_chars() and hvc_put_chars() api to take vtermno rather than index number. - Added hvc_find_vtys() function. - Added hvc_instantiate() function which is implemented by a console driver wanting to receive a callback of and early console init. drivers/char/hvc_console.c ========================== - Switch khvcd from kernel_threads to kthreads which got rid of deprecated daemonize(). - Added module exit clause to be thorough (not terribly necessary with a console driver of course) - Added early discovery of vterm/vty adapters by doing a bus walk on early console init which results in hvc_instantiate() callback and addition of the vtermno into a static array of vtermnos supported as console adapters (meaning the console api's work against these vtermnos prior to full console initialization). - This driver is now registered as a vio driver which means that vty adapters are now managed via probe/remove. This means hvc_console supports hotplug vty adapters. - Driver now requests more device nodes than what was found on the initial bus walk when registered as a tty driver to make room for hotplug vty adapters. These secondary vty adapters provide a tty tunnel between partitions. - Removed static hvc_struct array and replaced with a linux list that has elements (hvc_struct instances) added/removed on probe/remove AFTER early console init. This is important because kmalloc can't be done at early console init. - Driver now either runs in interrupt driven mode or in polling mode on older hardware. The khvcd is smart enough to not 'schedule()' when there are no interrupts. - kobjects are now used for ref counting on the hvc_struct instances. - This driver puts the tty layer to sleep on hvc_close() if there are pending data writes being blocked by firmware. - Removed useless spinlocks in hvc_chars_in_buffer() and hvc_write_room. Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by:
Ryan S. Arnold <rsa@us.ibm.com> Signed-off-by:
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Paul Fulghum authored
Bug Fixes: * Fix transmit end of message (EOM) processing to work correctly with hardware auto CTS feature * Fix oops in error path if hardware diags fail during device initialization Cosmetic change: * Use existing macros for address space size instead of hardcoded values Signed-off-by:
Paul Fulghum <paulkf@microgate.com> Signed-off-by:
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David Howells authored
The attached patch fixes a bug introduced into do_generic_mapping_read() by which a file pointer becomes required. I'd arranged things so that the file pointer was optional so that I could call the function directly on an inode. Signed-Off-By:
David Howells <dhowells@redhat.com> Signed-off-by:
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H. Peter Anvin authored
This patch allows i386 signal delivery to work correctly when userspace is compiled with -mregparm. This is somewhat hacky: it passes the arguments *both* on the stack and in registers, but it works because there are only one or three (depending on SA_SIGINFO) official arguments. If you're relying on the unofficial arguments then you're doing something nonportable anyway and can put in the __attribute__((cdecl,regparm(0))) in the correct place. Signed-off-by:
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Jeff Moyer authored
This patch contains the updates necessary to fix the hangs in netconsole. This includes the changing of trapped to an atomic_t, and the addition of a netpoll_poll_lock. It also turns dev->netpoll_rx into a bitfield which is used to keep from running the networking code from the netpoll_poll call path. Signed-off-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
Matt Mackall <mpm@selenic.com> Signed-off-by:
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Jeff Moyer authored
I've upped the poll budget to 16 and added a comment explaining why. I definitely ran into this problem when testing netdump. Signed-off-by:
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Jeff Moyer authored
This patch removes CONFIG_NETPOLL_RX, as discussed. Signed-off-by:
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Matt Mackall authored
Here's the first of the broken out patch set. This puts the check for netif_queue_stopped back into netpoll_send_skb. Network drivers are not designed to have their hard_start_xmit routines called when the queue is stopped. Signed-off-by:
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Matt Mackall authored
Avoid some alignment traps. Signed-off-by:
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Paolo Ornati authored
drivers/built-in.o(.data+0x40a68): undefined reference to `cfb_fillrect' drivers/built-in.o(.data+0x40a6c): undefined reference to `cfb_copyarea' 3dfx framebuffer driver depends on "cfb_fillrect.c" and "cfb_copyarea.c" if it's compiled without CONFIG_FB_3DFX_ACCEL turned on... Signed-off-by:
Paolo Ornati <ornati@fastwebnet.it> Signed-off-by:
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Andy Whitcroft authored
There are a couple of places where we seem to go round the houses to get the numa node id from a page. We have a macro for this so it seems sensible to use that. Both lookup_node and enqueue_huge_page use page_zone() to locate the zone, that to locate node pgdat_t and that to get the node_id. Its more efficient to use page_to_nid() which gets the nid from the page flags, especially if we are not using the zone for anything else it. Change these to use page_to_nid(). Signed-off-by:
Andy Whitcroft <apw@shadowen.org> Signed-off-by:
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Andy Whitcroft authored
(Comment changes only) The bootmem allocator is initialised before the kernel virtual address space has been fully established. As a result, any allocations which are made before paging_init() has completed may point to invalid kernel addresses. This patch notes this limitation and indicates where the allocator is fully available. Signed-off-by:
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Rusty Russell authored
Don't want to go overboard with the checks, but this is simple and reasonable. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (modified) Signed-off-by:
Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it> Signed-off-by:
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Olaf Kirch authored
There is a dentry refcount leak in devpts_get_tty. struct tty_struct *devpts_get_tty(int number) { struct dentry *dentry = get_node(number); struct tty_struct *tty; tty = (IS_ERR(dentry) || !dentry->d_inode) ? NULL : dentry->d_inode->u.generic_ip; up(&devpts_root->d_inode->i_sem); return tty; } The get_node function does a lookup on /dev/pts/<number> and returns the dentry, taking a reference. We should dput the dentry after extracting the tty pointer. Signed-off-by: -
Joanne Dow authored
I have a large archive of files stored on Amiga volumes. Many of these volumes are on Fujitsu magneto-optical disks with 2k sector size. The existing partitioning code cannot properly read them since it appears the OS automatically deblocks the large sectors into logical 512 byte sectors, something AmigaDOS never did. I arranged the partitioning code to handle this situation. Second I have some rather strange test case disks, including my largest storage partition, that have somewhat unusual partition values. As such I needed additional information in addition to the first and last block number information. AmigaDOS reserves N blocks, with N greater than or equal to 1 and less than the size of the partition, for some boot time information and signatures. I have some partitions that use other than the usual value of 2. There is one more "fix" that could be put in if someone needs it. Another value in the "Rigid Disk Blocks" description of a partition is a "PreAlloc" value. It defines a number of blocks at the end of the disk that are not considered to be a real part of the partition. This was "important" in the days of 20 meg and 40 meg hard disks. It is hardly important and not used on modern drives without special user intervention. This partitioning information is known correct. I wrote the low level portion of the hard disk partitioning code for AmigaDOS 3.5 and 3.9. I am also responsible for one of the more frequently used partitioning tools, RDPrepX, before that. Signed-off-by:
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Nick Piggin authored
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Nick Piggin authored
Use hlists for the PID hashes. This halves the memory footprint of these hashes. No benchmarks, but I think this is a worthy improvement because the hashes are something that would be likely to have significant portions loaded into the cache of every CPU on some workloads. This comes at the "expense" of 1. reintroducing the memory prefetch into the hash traversal loop; 2. adding new pids to the head of the list instead of the tail. I suspect that if this was a big problem then the hash isn't sized well or could benefit from moving hot entries to the head. Also, account for all the pid hashes when reporting hash memory usage. Signed-off-by:
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Nick Piggin authored
A 4GB, 4-way Opteron would create the smallest size table (16 entries) because pidhash_init is called before mem_init which is where x86-64 sets up max_pfn. nr_kernel_pages is setup by paging_init, called from setup_arch, which is also where i386 sets up max_pfn. So export nr_kernel_pages, nr_all_pages. Use nr_kernel_pages when sizing the PID hash. This fixes the problem. This also makes the pid hash dependant on the size of ZONE_NORMAL instead of total size of memory. Signed-off-by:
Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by:
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Roland McGrath authored
This patch changes the rusage bookkeeping and the semantics of the getrusage and times calls in a couple of ways. The first change is in the c* fields counting dead child processes. POSIX requires that children that have died be counted in these fields when they are reaped by a wait* call, and that if they are never reaped (e.g. because of ignoring SIGCHLD, or exitting yourself first) then they are never counted. These were counted in release_task for all threads. I've changed it so they are counted in wait_task_zombie, i.e. exactly when being reaped. POSIX also specifies for RUSAGE_CHILDREN that the report include the reaped child processes of the calling process, i.e. whole thread group in Linux, not just ones forked by the calling thread. POSIX specifies tms_c[us]time fields in the times call the same way. I've moved the c* fields that contain this information into signal_struct, where the single set of counters accumulates data from any thread in the group that calls wait*. Finally, POSIX specifies getrusage and times as returning cumulative totals for the whole process (aka thread group), not just the calling thread. I've added fields in signal_struct to accumulate the stats of detached threads as they die. The process stats are the sums of these records plus the stats of remaining each live/zombie thread. The times and getrusage calls, and the internal uses for filling in wait4 results and siginfo_t, now iterate over the threads in the thread group and sum up their stats along with the stats recorded for threads already dead and gone. I added a new value RUSAGE_GROUP (-3) for the getrusage system call rather than changing the behavior of the old RUSAGE_SELF (0). POSIX specifies RUSAGE_SELF to mean all threads, so the glibc getrusage call will just translate it to RUSAGE_GROUP for new kernels. I did this thinking that someone somewhere might want the old behavior with an old glibc and a new kernel (it is only different if they are using CLONE_THREAD anyway). However, I've changed the times system call to conform to POSIX as well and did not provide any backward compatibility there. In that case there is nothing easy like a parameter value to use, it would have to be a new system call number. That seems pretty pointless. Given that, I wonder if it is worth bothering to preserve the compatible RUSAGE_SELF behavior by introducing RUSAGE_GROUP instead of just changing RUSAGE_SELF's meaning. Comments? I've done some basic testing on x86 and x86-64, and all the numbers come out right after these fixes. (I have a test program that shows a few Signed-off-by:
Roland McGrath <roland@redhat.com> Signed-off-by:
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Roland McGrath authored
This patch adds a new system call `waitid'. This is a new POSIX call that subsumes the rest of the wait* family and can do some things the older calls cannot. A minor addition is the ability to select what kinds of status to check for with a mask of independent bits, so you can wait for just stops and not terminations, for example. A more significant improvement is the WNOWAIT flag, which allows for polling child status without reaping. This interface fills in a siginfo_t with the same details that a SIGCHLD for the status change has; some of that info (e.g. si_uid) is not available via wait4 or other calls. I've added a new system call that has the parameter conventions of the POSIX function because that seems like the cleanest thing. This patch includes the actual system call table additions for i386 and x86-64; other architectures will need to assign the system call number, and 64-bit ones may need to implement 32-bit compat support for it as I did for x86-64. The new features could instead be provided by some new kludge inventions in the wait4 system call interface (that's what BSD did). If kludges are preferable to adding a system call, I can work up something different. I added a struct rusage field si_rusage to siginfo_t in the SIGCHLD case (this does not affect the size or layout of the struct). This is not part of the POSIX interface, but it makes it so that `waitid' subsumes all the functionality of `wait4'. Future kernel ABIs (new arch's or whatnot) can have only the `waitid' system call and the rest of the wait* family including wait3 and wait4 can be implemented in user space using waitid. There is nothing in user space as yet that would make use of the new field. Most of the new functionality is implemented purely in the waitid system call itself. POSIX also provides for the WCONTINUED flag to report when a child process had been stopped by job control and then resumed with SIGCONT. Corresponding to this, a SIGCHLD is now generated when a child resumes (unless SA_NOCLDSTOP is set), with the value CLD_CONTINUED in siginfo_t.si_code. To implement this, some additional bookkeeping is required in the signal code handling job control stops. The motivation for this work is to make it possible to implement the POSIX semantics of the `waitid' function in glibc completely and correctly. If changing either the system call interface used to accomplish that, or any details of the kernel implementation work, would improve the chances of getting this incorporated, I am more than happy to work through any issues. Signed-off-by:
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Anton Blanchard authored
I tested how long it took to do a dd from /dev/random on ppc64 before and after this patch, while doing a ping flood from another machine. before: # /usr/bin/time dd if=/dev/random of=/dev/zero count=1k 0+51 records in Command terminated by signal 2 0.00user 0.00system 19:18.46elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k I gave up after 19 minutes. after: # /usr/bin/time dd if=/dev/random of=/dev/zero count=1k 0+1024 records in 0.00user 0.00system 0:33.38elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k Just over 33 seconds. Better. From: Arnd Bergmann <arnd@arndb.de> I noticed that only i386 and x86-64 are currently using a high resolution timer source when adding randomness. Since many architectures have a working get_cycles() implementation, it seems rather straightforward to use that. Has this been discussed before, or can anyone comment on the implementation below? This patch attempts to take into account the size of cycles_t, which is either 32 or 64 bits wide but independent of the architecture's word size. The behavior should be nearly identical to the old one on i386, x86-64 and all architectures without a time stamp counter, while finding more entropy on the other architectures. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Andi Kleen authored
Apply this handy patch and boot with numa=fake=4 (or how many nodes you want, 8 max right now). There is a minor issue with the hash function, which can make the last node be bigger than the others. Is probably fixable if it should be a problem. Signed-off-by:
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Matt Mackall authored
A patch to replace tmpfs/shmem with ramfs for systems without swap, incorporating the suggestions from Andi and Hugh. It uses ramfs instead. Signed-off-by:
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Alan Cox authored
This adds VLAN support to the 3c59x/90x series hardware. Stefan de Konink ported this code from the 2.4 VLAN patches and tested it extensively. I cleaned up the ifdefs and fixed a problem with bracketing that made older cards fail. -- Developer's Certificate of Origin 1.0 By making a contribution to this project, I certify that: (a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or (b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or (c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it. I, Stefan de Konink, certify that: The contribution is based upon previous work that, again is based on GPL code and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license. I, Alan Cox, certify likewise. Signed-off-by:
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Andrew Morton authored
Fix scheduling latency issues with large truncates. Signed-off-by:
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Oleg Nesterov authored
Hugetlbfs silently coerce private mappings of hugetlb files into shared ones. So private writable mapping has MAP_SHARED semantics. I think, such mappings should be disallowed. First, such behavior allows open hugetlbfs file O_RDONLY, and overwrite it via mmap(PROT_READ|PROT_WRITE, MAP_PRIVATE), so it is security bug. Second, private writable mmap() should fail just because kernel does not support this. I belisve, it is ok to allow private readonly hugetlb mappings, sys_mprotect() does not work with hugetlb vmas. There is another problem. Hugetlb mapping is always prefaulted, pages allocated at mmap() time. So even readonly mapping allows to enlarge the size of the hugetlbfs file, and steal huge pages without appropriative permissions. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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Oleg Nesterov authored
Hugetlbfs mmap with MAP_PRIVATE becomes MAP_SHARED silently, but vma->vm_flags have no VM_SHARED bit. Reading from /dev/zero into hugetlb area will do: read_zero() read_zero_pagealigned() if (vma->vm_flags & VM_SHARED) break; // fallback to clear_user() zap_page_range(); zeromap_page_range(); It will hit BUG_ON() in unmap_hugepage_range() if region is not huge page aligned, or silently convert it into the private anonymous mapping. Signed-off-by: -
Dave Hansen authored
This is a helper function that a few architectures already have. This just copies the i386 implementation to ppc64. Signed-off-by:
Dave Hansen <haveblue@us.ibm.com> Signed-off-by:
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Paul Mackerras authored
With earlier setup of cpu_possible_map the number of irqstacks shrinks from NR_CPUS to the number of possible cpus. Signed-off-by:
Nathan Lynch <nathanl@austin.ibm.com> Signed-off-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Paul Mackerras authored
Move the initialization of the per-cpu paca->hw_cpu_id out of the Open Firmware client boot code and into a common location which is executed later. Signed-off-by:
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Paul Mackerras authored
Move all cpu map initializations to one place (except for the online map -- cpus mark themselves online as they come up). This sets up cpu_possible_map early enough that we can use num_possible_cpus for allocating irqstacks instead of NR_CPUS. Hopefully this should also help set the stage for kexec. Signed-off-by:
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Paul Mackerras authored
David Engebretsen has moved on to other things and is no longer maintaining ppc64. This patch adds an entry in CREDITS to note his contribution in leading the team that did the PPC64 port originally and updates various PPC-related MAINTAINERS entries. Signed-off-by:
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Takashi Iwai authored
Currently add_interrupt_randomness() is called at each interrupt when one of the handlers has SA_SAMPLE_RANDOM flag, regardless whether the interrupt is processed by that handler or not. This results in the higher latency and perfomance loss. The patch fixes this behavior to avoid the unnecessary call by checking the return value from each handler. Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Prasanna S. Panchamukhi authored
A special kprobe type which can be placed on function entry points, and employs a simple mirroring principle to allow seamless access to the arguments of a function being probed. The probe handler routine should have the same prototype as the function being probed. Currently implemented for x86. The way it works is that when the probe is hit, the breakpoint handler simply irets to the probe handler's eip while retaining register and stack state corresponding to the function entry. After it is done, the probe handler calls jprobe_return() which traps again to restore processor state and switch back to the probed function. Linus noted correctly at KS that we need to be careful as gcc assumes that the callee owns arguments. We save and restore enough stack bytes to cover argument space. Sample Usage: static int jip_queue_xmit(struct sk_buff *skb, int ipfragok) { ... whatever ... jprobe_return(); return 0; } struct jprobe jp = { {.addr = (kprobe_opcode_t *) ip_queue_xmit}, .entry = (kprobe_opcode_t *) jip_queue_xmit }; register_jprobe(&jp); Signed-off-by: -
Prasanna S. Panchamukhi authored
This patch helps developers to trap at almost any kernel code address, specifying a handler routine to be invoked when the breakpoint is hit. Useful for analysing the Linux kernel by collecting debugging information non-disruptively. Employs single-stepping out-of-line to avoid probe misses on SMP and may be especially useful in aiding debugging elusive races and problems on live systems. More elaborate dynamic tracing tools such as DProbes can be built over the kprobes interface. Helps developers to trap at almost any kernel code address, specifying a handler routine to be invoked when the breakpoint is hit. Useful for analysing the Linux kernel by collecting debugging information non-disruptively. Employs single-stepping out-of-line to avoid probe misses on SMP and may be especially useful in aiding debugging elusive races and problems on live systems. More elaborate dynamic tracing tools such as DProbes can be built over the kprobes interface. Sample usage: To place a probe on __blockdev_direct_IO: static int probe_handler(struct kprobe *p, struct pt_regs *) { ... whatever ... } struct kprobe kp = { .addr = __blockdev_direct_IO, .pre_handler = probe_handler }; register_kprobe(&kp); Signed-off-by: -
Prasanna S. Panchamukhi authored
This patch provides notifiers for i386 architecture exceptions. This patch has been ported from x86_64 architecture as suggested by Andi Kleen. Signed-off-by:
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Philippe Elie authored
Contributions from Zarakin <zarakin@hotpop.com> Intel removed two msrs: MSR_P4_IQ_ESCR_0|1 (0x3ba/0x3bb), P4 model >= 3. See Intel documentation Vol. 3 System Programming Guide Appendix B. nmi_watchdog=2 oopsed at boot time and oprofile at driver load. Avoid touching them when model >= 3. Signed-off-by:
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