- 11 Apr, 2006 6 commits
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Jens Axboe authored
Also corrects a few comments. Patch mainly from Ingo, changes by me. Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Jens Axboe <axboe@suse.de>
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Jens Axboe authored
- Kill the local variables that cache ->nrbufs, they just take up space. - Only set do_wakeup for a real pipe. This is a big win for direct splicing. - Kill i_mutex lock around ->f_pos update, regular io paths don't do this either. Signed-off-by: -
Ingo Molnar authored
more code cleanups after the macro conversion: - standardize on 'struct pipe_inode_info *pipe' variable names - introduce 'pipe' temporaries to reduce mass inode->i_pipe dereferencing Signed-off-by:
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Ingo Molnar authored
get rid of the PIPE_*() macros. Scripted transformation. Signed-off-by:
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Jens Axboe authored
Using find_get_page() is a lot faster than find_or_create_page(). This gets splice a lot closer to sendfile() for fd -> socket transfers. Signed-off-by: -
Jens Axboe authored
It's more efficient for sendfile() emulation. Basically we cache an internal private pipe and just use that as the intermediate area for pages. Direct splicing is not available from sys_splice(), it is only meant to be used for sendfile() emulation. Additional patch from Ingo Molnar to avoid the PIPE_BUFFERS loop at exit for the normal fast path. Signed-off-by:
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- 10 Apr, 2006 8 commits
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Ingo Molnar authored
add optional input and output offsets to sys_splice(), for seekable file descriptors: asmlinkage long sys_splice(int fd_in, loff_t __user *off_in, int fd_out, loff_t __user *off_out, size_t len, unsigned int flags); semantics are straightforward: f_pos will be updated with the offset provided by user-space, before the splice transfer is about to begin. Providing a NULL offset pointer means the existing f_pos will be used (and updated in situ). Providing an offset for a pipe results in -ESPIPE. Providing an invalid offset pointer results in -EFAULT. Signed-off-by: -
Ingo Molnar authored
separate out the 'internal pipe object' abstraction, and make it usable to splice. This cleans up and fixes several aspects of the internal splice APIs and the pipe code: - pipes: the allocation and freeing of pipe_inode_info is now more symmetric and more streamlined with existing kernel practices. - splice: small micro-optimization: less pointer dereferencing in splice methods Signed-off-by:
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Jens Axboe authored
We don't want to call into the read-ahead logic unless we are at the start of a page, _or_ we have multiple pages to read. Signed-off-by: -
Jens Axboe authored
We don't really need to lock down the pages, just make sure they are uptodate. Signed-off-by: -
Jens Axboe authored
The whole shadow/pages logic got overly complex, and this simpler approach is actually faster in testing. Signed-off-by: -
Jens Axboe authored
__wake_up_common() is pretty heavy in the kernel profiles, this brings it down to a more acceptable level. Signed-off-by: -
Dave Jones authored
We can get to out: with a NULL page, which we probably don't want to be calling page_cache_release() on. Signed-off-by:
Dave Jones <davej@redhat.com> Signed-off-by:
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Jens Axboe authored
We should do that, since we do the LRU manipulation ourselves now. Suggested by Nick Piggin. Signed-off-by:
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- 09 Apr, 2006 26 commits
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Dave Jones authored
security/selinux/xfrm.c: In function 'selinux_socket_getpeer_dgram': security/selinux/xfrm.c:284: error: 'struct sec_path' has no member named 'x' security/selinux/xfrm.c: In function 'selinux_xfrm_sock_rcv_skb': security/selinux/xfrm.c:317: error: 'struct sec_path' has no member named 'x' Signed-off-by:David S. Miller <davem@davemloft.net> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Linus Torvalds authored
This effectively undoes the PCI resource allocation changes done in commit b408cbc7, but leaves the cleanups of that commit in place. We're going back to marking the resources reported by e820 busy _before_ doing PCI probing, so that any PCI resource that clashes with the BIOS- reported memory map will be reloacted to a non-clashing area. The reason? Larry Finger reports that his laptop has the cardbus controller set up by the BIOS so that it conflicts with the e820 memory map, and needs to be relocated. See http://bugzilla.kernel.org/show_bug.cgi?id=6337 for more details. We'll have to work out how to handle the fbcon problem that caused that commit in the first place in some other way. Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Antonino A. Daplas <adaplas@pol.net> Cc: <bjk@luxsci.net> Tested-by:
Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by:
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@suse.de> Signed-off-by:
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Andi Kleen authored
Or rather compute it based on the table length automatically. This also has the intended side effect of not warning for new system calls anymore. Signed-off-by:
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Sam Ravnborg authored
Fix CONFIG_REORDER. The value of cflags-y was assined to CFLAGS before cflags-y was assigned the value used for CONFIG_REORDER. Use cflags-y for all CFLAGS options in the Makefile to avoid this happening again. Signed-off-by:
Sam Ravnborg <sam@ravnborg.org> Signed-off-by:
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John Blackwood authored
In linux-2.6.16, we have noticed a problem where the gs base value returned from an arch_prtcl(ARCH_GET_GS, ...) call will be incorrect if: - the current/calling task has NOT set its own gs base yet to a non-zero value, - some other task that ran on the same processor previously set their own gs base to a non-zero value. In this situation, the ARCH_GET_GS code will read and return the MSR_KERNEL_GS_BASE msr register. However, since the __switch_to() code does NOT load/zero the MSR_KERNEL_GS_BASE register when the task that is switched IN has a zero next->gs value, the caller of arch_prctl(ARCH_GET_GS, ...) will get back the value of some previous tasks's gs base value instead of 0. Change the arch_prctl() ARCH_GET_GS code to only read and return the MSR_KERNEL_GS_BASE msr register if the 'gs' register of the calling task is non-zero. Side note: Since in addition to using arch_prctl(ARCH_SET_GS, ...), a task can also setup a gs base value by using modify_ldt() and write an index value into 'gs' from user space, the patch below reads 'gs' instead of using thread.gs, since in the modify_ldt() case, the thread.gs value will be 0, and incorrect value would be returned (the task->thread.gs value). When the user has not set its own gs base value and the 'gs' register is zero, then the MSR_KERNEL_GS_BASE register will not be read and a value of zero will be returned by reading and returning 'task->thread.gs'. The first patch shown below is an attempt at implementing this approach. Signed-off-by: -
Andi Kleen authored
Printk doesn't have any value Signed-off-by:
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Jordan Hargrave authored
If the HPET timer is enabled, the clock can drift by ~3 seconds a day. This is due to the HPET timer not being initialized with the correct setting (still using PIT count). If HZ changes, this drift can become even more pronounced. HPET patch initializes tick_nsec with correct tick_nsec settings for HPET timer. Vojtech comments: "It's not entirely correct (it assumes the HPET ticks totally exactly), but it's significantly better than assuming the PIT error there." Signed-off-by:
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Andi Kleen authored
Mostly to get better handling when a extended config space access has to fallback to Type1. Cc: gregkh@suse.de Signed-off-by:
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Andi Kleen authored
Previously only the first bus would be checked against Type 1. Why 16? Checking all would need too much memory and we can assume that systems with more than 16 busses have better than average quality BIOS. This is an additional defense against bad MCFG tables. Signed-off-by:
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Ravikiran G Thirumalai authored
Fixup the read mostly section to start at internode cacheline boundary. Signed-off-by:
Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by:
Shai Fultheim <shai@scalex86.org> Signed-off-by:
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Andi Kleen authored
Signed-off-by:
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Andi Kleen authored
Fix WARNING: vmlinux: 'strlen' exported twice. Previous export was in vmlinux Reported by Mats Johannesson Signed-off-by:
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Andi Kleen authored
Intel EM64T CPUs handle uncanonical return addresses differently from AMD CPUs. The exception is reported in the SYSRET, not the next instruction. This leads to the kernel exception handler running on the user stack with the wrong GS because the kernel didn't expect exceptions on this instruction. This version of the patch has the teething problems that plagued an earlier version fixed. This is CVE-2006-0744 Thanks to Ernie Petrides and Asit B. Mallick for analysis and initial patches. Signed-off-by:
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Andi Kleen authored
Machine checks can stall the machine for a long time and it's not good to trigger the nmi watchdog during that. Signed-off-by:
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Dave Hansen authored
The generic linux/numa.h file defines NODES_SHIFT to 0 in case the architecture did not. Every architecture which has a NUMA config option defines NODES_SHIFT in its asm-$ARCH headers, but only if NUMA is enabled, except for x86_64. This should make it like all the rest. Signed-off-by:
Dave Hansen <haveblue@us.ibm.com> Signed-off-by:
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Jacob Shin authored
This prevents crashes on dual core system when enough ticks are lost. Replaces earlier patch by me. Cc: Dave Jones <davej@redhat.com> Signed-off-by:
Thomas Renninger <trenn@suse.de> Signed-off-by:
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Andi Kleen authored
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Andi Kleen authored
AMD systems have a modern APIC that supports 8 bit IDs, but don't have a XAPIC version number. Add a new "modern_apic" subfunction that handles this correctly and use it (nearly) everywhere where XAPIC is tested for. I removed one wart: the code specified that external APICs would use an 8bit APIC ID. But I checked a real 82093 data sheet and it says clearly that they only use 4bit. So I removed this special case since it would a bit awkward to implement now. I removed the valid APIC tests in mptable parsing completely. On any modern system they only check against the full field width (8bit) anyways and are no-ops. This also fixes them doing the wrong thing on >8 core Opterons. This makes i386 boot again on 16 core Opterons. Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by:
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Andi Kleen authored
Needed for other checks later in ACPI. Pointed out by Len Brown Signed-off-by:
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Andi Kleen authored
When nolapic was passed or the local APIC was disabled for another reason ACPI would still parse the IO-APICs until these were explicitely disabled with noapic. Usually this resulted in a non booting configuration unless "nolapic noapic" was used. I also disabled the local APIC parsing in this case, although that's only cosmetic (suppresses a few printks) This hopefully makes nolapic work in all cases. Signed-off-by:
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Andi Kleen authored
Horus systems don't have anything on bus 0 which makes the Type 1 sanity checks fail. Use the DMI BIOS year to check for newer systems and always assume Type 1 works on them. I used 2001 as an pretty arbitary cutoff year. Cc: gregkh@suse.de Cc: Navin Boppuri <navin.boppuri@newisys.com> Signed-off-by:
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Andi Kleen authored
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Arjan van de Ven authored
This patch introduces a user for the e820_all_mapped function: There have been several machines that don't have a working MMCONFIG, often because of a buggy MCFG table in the ACPI bios. This patch adds a simple sanity check that detects a whole bunch of these cases, and when it detects it, linux now boots rather than crash-and-burns. The accuracy of this detection can in principle be improved if there was a "is this entire range in e820 with THIS attribute", but no such function exist and the complexity needed for this is not really worth it; this simple check already catches most cases anyway. Signed-off-by:
Arjan van de Ven <arjan@linux.intel.com> Signed-off-by:
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Arjan van de Ven authored
Introduce a e820_all_mapped() function which checks if the entire range <start,end> is mapped with type. This is done by moving the local start variable to the end of each known-good region; if at the end of the function the start address is still before end, there must be a part that's not of the correct type; otherwise it's a good region. Signed-off-by:
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Arjan van de Ven authored
Rename e820_mapped to e820_any_mapped since it tests if any part of the range is mapped according to the type. Later steps will introduce e820_all_mapped which will check if the entire range is mapped with the type. Both have their merit. Signed-off-by:
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