- 01 Nov, 2005 13 commits
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Dan Williams authored
Patch from Dan Williams * If request_irq fails then a call to release_mem_region will be made with an invalid pointer. * Two formatting fixes Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
Deepak Saxena <dsaxena@plexity.net> Signed-off-by:
Russell King <rmk+kernel@arm.linux.org.uk>
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Lennert Buytenhek authored
Patch from Lennert Buytenhek This patch adds a microcode loader for the ixp2000 architecture. The ixp2000 is an xscale-based CPU with a number of additional small CPUs ('microengines') on die that can be programmed to do various things. Depending on the ixp2000 model, there are between 2 and 16 microengines. This code provides an API that allows configuring the microengines, loading code into them, and starting and stopping them and reading out a number of status registers, and is used by the microengine network driver that was recently announced to netdev. Signed-off-by:Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre This patch provides a preemption safe implementation of copy_to_user and copy_from_user based on the copy template also used for memcpy. It is enabled unconditionally when CONFIG_PREEMPT=y. Otherwise if the configured architecture is not ARMv3 then it is enabled as well as it gives better performances at least on StrongARM and XScale cores. If ARMv3 is not too affected or if it doesn't matter too much then uaccess.S could be removed altogether. Signed-off-by:
Nicolas Pitre <nico@cam.org> Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre This patch provides a new implementation for optimized memory copy functions on ARM. It is made of two levels: a template that consists of the core copy code and separate files that define macros to be used with the core code depending on the type of copy needed. This allows for best performances while sharing the same core for implementing memcpy(), copy_from_user() and copy_to_user() for instance. Two reasons for this work: 1) the current copy_to_user/copy_from_user implementation assumes no task switch will ever occur in the middle of each copied page making it completely unsafe with CONFIG_PREEMPT=y. 2) current copy implementations are measurably suboptimal and optimizing different implementations separately is a pain and more opportunities for bugs. The reason for (1) is the fact that copy inside user pages are performed with the ldm instruction which has no mean for testing user protections and could possibly race with process preemption bypassing the COW mechanism for example. This is a longstanding issue that we said ought to be fixed for about two years now. The solution is to substitute those ldm insns with a series of ldrt or strt insns to enforce user memory protection. At least on StrongARM and XScale cores the ldm is not faster than the equivalent ldr/str insns with a warm i-cache so there is no measurable performance degradation with that change. The fact that the copy code is a template makes it pretty easy to reuse the same core code as for memcpy and benefit from the same performance optimizations. Now (2) is best demonstrated with actual throughput measurements. First, here is a summary of memcopy tests performed on a StrongARM core: PTR alignment buffer size kernel version this version ------------------------------------------------------------ aligned 32 59.73 107.43 unaligned 32 61.31 74.72 aligned 100 132.47 136.15 unaligned 100 103.84 123.76 aligned 4096 130.67 130.80 unaligned 4096 130.68 130.64 aligned 1048576 68.03 68.18 unaligned 1048576 68.03 68.18 The buffer size is in bytes and the measured speed in MB/s. The copy was performed repeatedly with given buffer and throughput averaged over 3 seconds. Here we can see that the current kernel version has a higher entry cost that shows up with small buffers. As buffer size grows both implementation converge to the same throughput. Now here's the exact same test performed on an XScale core (PXA255): PTR alignment buffer size kernel version this version ------------------------------------------------------------ aligned 32 46.99 77.58 unaligned 32 53.61 59.59 aligned 100 107.19 136.59 unaligned 100 83.61 97.58 aligned 4096 129.13 129.98 unaligned 4096 128.36 128.53 aligned 1048576 53.76 59.41 unaligned 1048576 33.67 56.96 Again we can see the entry setup cost being higher for the current kernel before getting to the main copy loop. Then throughput results converge as long as the buffer remains in the cache. Then the 1MB case shows more differences probably due to better pld placement and/or less instruction interlocks in this proposed implementation. Disclaimer: The PXA system was running with slower clocks than the StrongARM system so trying to infer any conclusion by comparing those separate sets of results side by side would be completely inappropriate. So... What this patch does is to replace both memcpy and memmove with an implementation based on the provided copy code template. The memmove code is kept separate since it is used only if the memory areas involved do overlap in which case the code is a transposition of the template but with the copy occurring in the opposite direction (trying to fit that mode into the template turned it into a mess not worth it for memmove alone). And obviously both memcpy and memmove were tested with all kinds of pointer alignments and buffer sizes to exercise all code paths for correctness. The next patch will provide the now trivial replacement implementation copy_to_user and copy_from_user. Signed-off-by:
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Nicolas Pitre authored
Patch from Nicolas Pitre Required for future enhancement patches. Signed-off-by:
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David Brownell authored
Patch from David Brownell Lubbock updates: * Provide an address for the SMC91x chip that doesn't generate a boot-time warning (matching the EEPROM). * Update MMC support to (a) detect card insert/remove, and (b) report the readonly switch setting for SD cards. Previously, MMC/SD cards had to be present at boot time else they couldn't be detected. Signed-off-by:David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:
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Ben Dooks authored
Patch from Ben Dooks Add definition for S3C2410_IISMOD_FS_MASK Signed-off-by:
Ben Dooks <ben-linux@fluff.org> Signed-off-by:
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Ben Dooks authored
Patch from Ben Dooks Update the Documentation/arm/Samsung-S3C24XX to add example platform data initialisation, and add the linux-arm mailing list URL. Signed-off-by:
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Ben Dooks authored
Patch from Ben Dooks Platform data for the LCD/framebuffer driver for the RX3715 LCD panel. Signed-off-by:
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Lennert Buytenhek authored
Patch from Lennert Buytenhek Misc ixp2000 typo and whitespace fixes. Signed-off-by:
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Lennert Buytenhek authored
Patch from Lennert Buytenhek Switch the users of ixp2000_reg_write that depend on writes being flushed out of the write buffer by the time that function returns over to ixp2000_reg_wrb. When using XCB=101, writes to the same functional unit are still guaranteed to complete in order, so we only need to protect against: - reordering of writes to different functional units - masking an interrupt and then reenabling the IRQ bit in CPSR Signed-off-by:
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Lennert Buytenhek authored
Patch from Lennert Buytenhek On the ixdp2x00, the slave CPU is currently not allowed to reset itself for fear that it will do something 'funky' on the PCI bus. This fear is ungrounded -- the slave CPU is wired up such that a CPU reset will not cause a PCI bus reset to be done. This patch changes arch_reset() so that the slave CPU also executes the reset sequence, allowing it to reboot itself using /sbin/reboot. Signed-off-by:
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Lennert Buytenhek authored
Patch from Lennert Buytenhek The enp2611 version of the ixp2000 netdev driver needs to be able to access a number of on-board peripherals. ioremap() is not suitable for this, as that will cause XCB=000 mappings to be done, which will make the cpu susceptible to crashing on ixp2400 erratum #66. Properly aligned iotable mappings with MT_IXP2000_DEVICE will cause section mappings with XCB=101 to be done, which is safe. Signed-off-by:
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- 31 Oct, 2005 27 commits
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Russell King authored
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Russell King authored
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Catalin Marinas authored
Support for RealView EB. Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
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Paul Mackerras authored
... namely, the change to the 2-argument pte_alloc_kernel. Signed-off-by:Paul Mackerras <paulus@samba.org>
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Paul Mackerras authored
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Paul Mackerras authored
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Paul Mackerras authored
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Paul Mackerras authored
We had a static memory_limit in prom.c, and then another one defined in setup_64.c and used in numa.c, which resulted in the kernel crashing when mem=xxx was given on the command line. This puts the declaration in system.h and the definition in mem.c. This also moves the definition of tce_alloc_start/end out of setup_64.c. Signed-off-by: -
Linus Torvalds authored
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Linus Torvalds authored
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Linus Torvalds authored
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Pekka Enberg authored
This patch removes duplicate directory scanning code from fs/fat/dir.c. The two functions that share identical code are fat_readdirx() and fat_search_long(). This patch also renames fat_readdirx to __fat_readdir(). Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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OGAWA Hirofumi authored
Now, vfat_rename() is using vfat_find() for sanity check. This removes that sanity check, the cost of sanity check is too high. Signed-off-by:
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OGAWA Hirofumi authored
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Tim Schmielau authored
I recently picked up my older work to remove unnecessary #includes of sched.h, starting from a patch by Dave Jones to not include sched.h from module.h. This reduces the number of indirect includes of sched.h by ~300. Another ~400 pointless direct includes can be removed after this disentangling (patch to follow later). However, quite a few indirect includes need to be fixed up for this. In order to feed the patches through -mm with as little disturbance as possible, I've split out the fixes I accumulated up to now (complete for i386 and x86_64, more archs to follow later) and post them before the real patch. This way this large part of the patch is kept simple with only adding #includes, and all hunks are independent of each other. So if any hunk rejects or gets in the way of other patches, just drop it. My scripts will pick it up again in the next round. Signed-off-by:
Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by:
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Paul E. McKenney authored
Combine a bit of redundant code between force_sig_info() and force_sig_specific(). Signed-off-by: paulmck@us.ibm.com Signed-off-by:
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Oleg Nesterov authored
This patch removes checks for ->si_code == SI_TIMER from send_signal, specific_send_sig_info, __group_send_sig_info. I think posix-timers.c used these functions some time ago, now it sends signals via send_{,group_}sigqueue, so these hooks are unneeded. Signed-off-by:Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by:
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Oleg Nesterov authored
This patch simplifies some checks for magic siginfo values. It should not change the behaviour in any way. Signed-off-by:
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Oleg Nesterov authored
This patch replaces hardcoded SEND_SIG_xxx constants with their symbolic names. No changes in affected .o files. Signed-off-by:
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Randy Dunlap authored
- Use kzalloc() instead of kmalloc + memset. - Clean/fix some printk's. - Use NULL for pointers instead of 0. - Combine hpet busy searching locations into a function call. Signed-off-by:
Randy Dunlap <randy_d_dunlap@linux.intel.com> Signed-off-by:
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Randy Dunlap authored
- Use HPET physical address to detect duplicates, not logical addresses. Using logical (mapped) addresses fails to detect duplicates because ioremap() returns a new mapped address each time. - iounmap() regions when duplicate/busy areas are found. Signed-off-by:
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Randy Dunlap authored
Allow the ACPI HPET description table to use a resource type of FIXED_MEM32 for the HPET reource. Use the fixed resoure size of 1 KB for the HPET resource as per the HPET spec. Signed-off-by:
Bob Picco <bob.picco@hp.com> Signed-off-by:
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Clemens Ladisch authored
When booting, display the timer frequency in Hertz instead of as tick length in nanoseconds. Apart from saving a local variable, this makes the message more easily comprehensible. Signed-off-by:
Clemens Ladisch <clemens@ladisch.de> Cc: Bob Picco <bob.picco@hp.com> Signed-off-by:
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Clemens Ladisch authored
In the hpet_ioctl_common() function, devp->hd_hpets is already cached in the hpetp variable, so we can use just that. Signed-off-by:
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Clemens Ladisch authored
Fix two instances where a function would access the first HPET device instead of the current one. Signed-off-by:
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Clemens Ladisch authored
Clear the ht_opaque field in the hpet_register() function before searching for a free timer to prevent the function from incorrectly assuming that the search succeeded afterwards. Signed-off-by:
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Clemens Ladisch authored
Fix a division by zero that happened when the HPET_INFO ioctl was called before a timer frequency had been set. Signed-off-by:
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