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| * | CRIS v32: Update boot rescue Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | - Remove old specific targets, use more generic ones instead. - Use if_changed to avoid creating new images when no change. - Use EXTRA_CFLAGS instead of CFLAGS.
| * | CRIS v32: Update boot compressed Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | - Remove old specific targets, use more generic ones instead. - Use if_changed to avoid creating new images when no change. - Use KBUILD_CFLAGS instead of CFLAGS.
| * | CRIS v32: Update boot Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | - Remove old specific targets, use more generic ones instead. - Use if_changed to avoid creating new images when no change.
| * | CRIS v32: Update traps.cJesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | - Remove raw_prink hack, use oops_in_progress instead. - When ETRAX_WATCHDOG_NICE_DOGGY is set, loop in trap after oops dump instead of rebooting. - Break long lines to less than 80 chars. - Fix whitespace errors. - Remove unnecessary comments.
| * | CRIS v10: Update and improve axisflashmap.cJesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | - Add config to use mtd0 as whole flash device. - Fix whitespace errors. - Remove braces around single statement ifs. - Break long lines. - Remove unnecessary CVS log.
| * | CRIS v10: Update rescue head.sJesper Nilsson2008-02-08
| | | | | | | | | | | | | | | - Correct whitespace problems. - Add ifdef for ETRAX_AXISFLASHMAP to avoid compile error when not set.
| * | CRIS v10: Update rescue Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | - Remove old specific targets, use more generic ones instead. - Use if_changed to avoid creating new images when no change. Removes a lot of cruft. - Use EXTRA_CFLAGS instead of CFLAGS.
| * | CRIS v10: Update boot/compressed Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | - Remove old specific targets, use more generic ones instead. - Use if_changed to avoid creating new images when no change. - Use EXTRA_CFLAGS instead of CFLAGS.
| * | CRIS v10: Update boot Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | - Remove old specific targets, use more generic ones instead.
| * | CRIS: Update main Kbuild makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | - Remove old and non-generic targets, use generic ones instead. - Add sub-arch as mach-fs or mach-a3 for EtraxFS and Artpec-3 respectively. - Add links to sub-arch directories, and erase before trying to create them. - Include from sub-arch specific include directory "mach". - Add files to be cleaned in CLEAN_FILES instead of as archclean target.
| * | CRIS v32: Update and improve axisflashmapJesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | - Use default partition table when no partition is found (for initial tests) - Add config ETRAX_AXISFLASHMAP_MTD0WHOLE to allow whole flash as mtd0. - Add config for VCS simulator connection.
| * | CRIS v32: New version of I2C driver.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | - Add i2c_write and i2c_read as functions. - Use spinlocks for critical regions. - Add config item to set I2C data and clock port. - Put unneeded testcode inside #if 0. - Remove CVS id tag.
| * | CRIS v32: Fixup kernel Makefile.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | - Remove CRISv32 common arbiter, dma, io and pinmux files, they are now defined in machine dependent directories. - Add cache and cacheflush files for working around cache problems in CRISv32 chips.
| * | CRIS v32: Update entry.S to working order.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | - Remove oldset parameter. - Utilise delay-slot for parameter moving. - Add kernel_execve as break 13. - Add new kernel syscalls.
| * | CRIS v32: Whitespace and formatting changes for kernel/ptrace.cJesper Nilsson2008-02-08
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| * | CRIS: Minor generic kernel/traps.c changes.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | - Collect extern declarations at top of file. - Change raw_printk to printk, use oops_in_progress instead. - Fix formatting and whitespace. - Allow the watchdog to be disabled during oops.
| * | CRIS: Minor fixes to mm/fault.cJesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | - Only disallow oops if we're in_interrupt context (was in_atomic before) - Use the generic oops_in_progress instead of the raw_printk hack. - Fix whitespace/formatting. - Remove CVS log entries.
| * | CRIS: Remove unnecessary CVS log from cris/mm/init.cJesper Nilsson2008-02-08
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| * | CRIS v32: Update synchronous serial driver.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | Now uses a DMA descriptor ring, which should avoid any unnecessary pauses in the streams.
| * | CRIS v32: Add L2 cache initialization code.Jesper Nilsson2008-02-08
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| * | CRIS v32: Add hardware dependent include files and defconfigs for ETRAX FS ↵Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | and ARTPEC-3 chips. The header files describe the hardware registers available in both these chips, note that most of this documentation is automatically generated from the hardware implementation.
| * | CRIS v32: Add new machine dependent files for Etrax-FS and Artpec-3.Jesper Nilsson2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | The two chips are somewhat different, and needs different handling. Adds handing of the dma, dram initialization, hardware settings, io, memory arbiter and pinmux Also moves the dma, dram initialization and io from CRIS v32 common files.
| * | CRIS v32: Add new driver files for Etrax-FSJesper Nilsson2008-02-08
| | | | | | | | | | | | Adds gpio and nandflash handling for Etrax-FS
| * | CRIS v32: Add new driver files for Artpec-3.Jesper Nilsson2008-02-08
| | | | | | | | | | | | Adds gpio and nandflash handling for Artpec-3.
| * | CRIS: Rearrange Kconfigs for v10 and v32 to allow compilation without warnings.Jesper Nilsson2008-02-08
| |/ | | | | | | | | | | | | | | | | | | | | - Remove some unneeded configs and add some new ones. - Merge common config items to common file instead of duplicating them. - Pull in standard Kconfig.preempt. - Remove some unneeded Kconfigs for subsystems not (yet) available on CRIS (md, scsi, ieee1394, i2o, isdn, telephony, media, pcmcia, pci) - Rename CRISv32 config items which had different types from CRISv10. (ETRAX_LED2G, ETRAX_LED2R, ETRAX_LED3G, ETRAX_LED3R, ETRAX_I2C_DATA_PORT, ETRAX_I2C_CLK_PORT)
* | Merge branch 'for-2.6.25' of ↵Linus Torvalds2008-02-08
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'for-2.6.25' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Add arch-specific walk_memory_remove() for 64-bit powerpc [POWERPC] Enable hotplug memory remove for 64-bit powerpc [POWERPC] Add remove_memory() for 64-bit powerpc [POWERPC] Make cell IOMMU fixed mapping printk more useful [POWERPC] Fix potential cell IOMMU bug when switching back to default DMA ops [POWERPC] Don't enable cell IOMMU fixed mapping if there are no dma-ranges [POWERPC] Fix cell IOMMU null pointer explosion on old firmwares [POWERPC] spufs: Fix timing dependent false return from spufs_run_spu [POWERPC] spufs: No need to have a runnable SPU for libassist update [POWERPC] spufs: Update SPU_Status[CISHP] in backing runcntl write [POWERPC] spufs: Fix state_mutex leaks [POWERPC] Disable G5 NAP mode during SMU commands on U3
| * | [POWERPC] Add arch-specific walk_memory_remove() for 64-bit powerpcBadari Pulavarty2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | walk_memory_resource() verifies if there are holes in a given memory range, by checking against /proc/iomem. On x86/ia64 system memory is represented in /proc/iomem. On powerpc, we don't show system memory as IO resource in /proc/iomem - instead it's maintained in /proc/device-tree. This provides a way for an architecture to provide its own walk_memory_resource() function. On powerpc, the memory region is small (16MB), contiguous and non-overlapping. So extra checking against the device-tree is not needed. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kumar Gala <galak@gate.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Enable hotplug memory remove for 64-bit powerpcBadari Pulavarty2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Enable hotplug memory remove for ppc64. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kumar Gala <galak@gate.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Add remove_memory() for 64-bit powerpcBadari Pulavarty2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Supply remove_memory() function for 64-bit powerpc. This is still not quite complete as it needs to do some more arch-specific stuff, which will be added in a later patch. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Make cell IOMMU fixed mapping printk more usefulMichael Ellerman2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the cell IOMMU fixed mapping just printks that it's been setup, which is not particularly useful. Much more interesting is the address ranges for the different windows. This adds one line to dmesg on a blade. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Fix potential cell IOMMU bug when switching back to default DMA opsMichael Ellerman2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If we get a 64-bit dma mask we switch to the fixed ops and call cell_dma_dev_setup(). If the driver then switches back to a 32-bit dma mask for any reason we don't call cell_dma_dev_setup() again, which has the potential to leave bogus data in dev->archdata.dma_data. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Don't enable cell IOMMU fixed mapping if there are no dma-rangesMichael Ellerman2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | In order for the cell IOMMU fixed mapping to work we need "dma-ranges" properties in the device tree. If there are none then there's no point enabling the fixed mapping support. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Fix cell IOMMU null pointer explosion on old firmwaresMichael Ellerman2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | The cell IOMMU fixed mapping support has a null pointer bug if you run it on older firmwares that don't contain the "dma-ranges" properties. Fix it and convert to using of_get_next_parent() while we're there. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] spufs: Fix timing dependent false return from spufs_run_spuLuke Browning2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Stop bits are only valid when the running bit is not set. Status bits carry over from one invocation of spufs_run_spu() to another, so the RUNNING bit gets added to the previous state of the register which may have been a remote library call. In this case, it looks like another library routine should be invoked, but the spe is actually running. This fixes a problem with a testcase that exercises the scheduler. Signed-off-by: Luke Browning <lukebrowning@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] spufs: No need to have a runnable SPU for libassist updateLuke Browning2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We don't need to update the libassist statistic with the context in a runnable state, so do it after spu_disable_spu(). Signed-off-by: Luke Browning <lukebrowning@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] spufs: Update SPU_Status[CISHP] in backing runcntl writeMasato Noguchi2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, the kernel may fail to restart a SPE context which has stopped and been swapped out. This changes spu_backing_runcntl_write to emulate the real SPU_Status register exactly. When the SPU Run Control register is written with SPU_RunCntl[Run] set to '1', the physical SPU automatically sets SPU_Status[R] and clears SPU_Status[CISHP]. Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] spufs: Fix state_mutex leaksChristoph Hellwig2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix various state_mutex leaks. The worst one was introduced by the interrutible state_mutex conversion but there've been a few before too. Notably spufs_wait now returns without the state_mutex held when returning an error, which actually cleans up some code. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Luke Browning <lukebrowning@us.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
| * | [POWERPC] Disable G5 NAP mode during SMU commands on U3Benjamin Herrenschmidt2008-02-08
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It appears that with the U3 northbridge, if the processor is in NAP mode the whole time while waiting for an SMU command to complete, then the SMU will fail. It could be related to the weird backward mechanism the SMU uses to get to system memory via i2c to the northbridge that doesn't operate properly when the said bridge is in napping along with the CPU. That is on U3 at least, U4 doesn't seem to be affected. This didn't show before NO_HZ as the timer wakeup was enough to make it work it seems, but that is no longer the case. This fixes it by disabling NAP mode on those machines while an SMU command is in flight. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds2008-02-08
|\ \ | | | | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC64]: Make use of the new fs/compat_binfmt_elf.c [SPARC64]: Make use of compat_sys_ptrace() Manually fixed trivial delete/modift conflict in arch/sparc64/kernel/binfmt_elf32.c
| * | [SPARC64]: Make use of the new fs/compat_binfmt_elf.cDavid S. Miller2008-02-08
| | | | | | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
| * | [SPARC64]: Make use of compat_sys_ptrace()David S. Miller2008-02-08
| | | | | | | | | | | | Signed-off-by: David S. Miller <davem@davemloft.net>
* | | uml: fix mm_context memory leakJeff Dike2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | [ Spotted by Miklos ] Fix a memory leak in init_new_context. The struct page ** buffer allocated for install_special_mapping was never recorded, and thus leaked when the mm_struct was freed. Fix it by saving the pointer in mm_context_t and freeing it in arch_exit_mmap. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | uml: improved error handling while locating temp dirJim Meyering2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * arch/um/os-Linux/mem.c (make_tempfile): Don't deref NULL upon failed malloc. * arch/um/os-Linux/mem.c (make_tempfile): Handle NULL tempdir. Don't let a long tempdir (e.g., via TMPDIR) provoke heap corruption. [ jdike - formatting cleanups, deleted obsolete comment ] Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | uml: style fixes in arch/um/os-LinuxJeff Dike2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Style changes under arch/um/os-Linux: include trimming CodingStyle fixes some printks needed severity indicators make_tempfile turns out not to be used outside of mem.c, so it is now static. Its declaration in tempfile.h is no longer needed, and tempfile.h itself is no longer needed. create_tmp_file was also made static. checkpatch moans about an EXPORT_SYMBOL in user_syms.c which is part of a macro definition - this is copying a bit of kernel infrastructure into the libc side of UML because the kernel headers can't be included there. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | uml: runtime host VMSPLIT detectionJeff Dike2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Calculate TASK_SIZE at run-time by figuring out the host's VMSPLIT - this is needed on i386 if UML is to run on hosts with varying VMSPLITs without recompilation. TASK_SIZE is now defined in terms of a variable, task_size. This gets rid of an include of pgtable.h from processor.h, which can cause include loops. On i386, task_size is calculated early in boot by probing the address space in a binary search to figure out where the boundary between usable and non-usable memory is. This tries to make sure that a page that is considered to be in userspace is, or can be made, read-write. I'm concerned about a system-global VDSO page in kernel memory being hit and considered to be a userspace page. On x86_64, task_size is just the old value of CONFIG_TOP_ADDR. A bunch of config variable are gone now. CONFIG_TOP_ADDR is directly replaced by TASK_SIZE. NEST_LEVEL is gone since the relocation of the stubs makes it irrelevant. All the HOST_VMSPLIT stuff is gone. All references to these in arch/um/Makefile are also gone. I noticed and fixed a missing extern in os.h when adding os_get_task_size. Note: This has been revised to fix the 32-bit UML on 64-bit host bug that Miklos ran into. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | CONFIG_HIGHPTE vs. sub-page page tables.Martin Schwidefsky2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Background: I've implemented 1K/2K page tables for s390. These sub-page page tables are required to properly support the s390 virtualization instruction with KVM. The SIE instruction requires that the page tables have 256 page table entries (pte) followed by 256 page status table entries (pgste). The pgstes are only required if the process is using the SIE instruction. The pgstes are updated by the hardware and by the hypervisor for a number of reasons, one of them is dirty and reference bit tracking. To avoid wasting memory the standard pte table allocation should return 1K/2K (31/64 bit) and 2K/4K if the process is using SIE. Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means the s390 version for pte_alloc_one cannot return a pointer to a struct page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one cannot return a pointer to a pte either, since that would require more than 32 bit for the return value of pte_alloc_one (and the pte * would not be accessible since its not kmapped). Solution: The only solution I found to this dilemma is a new typedef: a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a later patch. For everybody else it will be a (struct page *). The additional problem with the initialization of the ptl lock and the NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and a destructor pgtable_page_dtor. The page table allocation and free functions need to call these two whenever a page table page is allocated or freed. pmd_populate will get a pgtable_t instead of a struct page pointer. To get the pgtable_t back from a pmd entry that has been installed with pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page call in free_pte_range and apply_to_pte_range. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | MIPS: Mark all but i8259 interrupts as no-probe.Ralf Baechle2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use set_irq_noprobe() to mark all MIPS interrupts as non-probe. Override that default for i8259 interrupts. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Acked-and-tested-by: Rob Landley <rob@landley.net> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | mount options: fix spufsMiklos Szeredi2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a .show_options super operation to spufs. Use generic_show_options() and save the complete option string in spufs_fill_super(). Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | avoid overflows in kernel/time.cH. Peter Anvin2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When the conversion factor between jiffies and milli- or microseconds is not a single multiply or divide, as for the case of HZ == 300, we currently do a multiply followed by a divide. The intervening result, however, is subject to overflows, especially since the fraction is not simplified (for HZ == 300, we multiply by 300 and divide by 1000). This is exposed to the user when passing a large timeout to poll(), for example. This patch replaces the multiply-divide with a reciprocal multiplication on 32-bit platforms. When the input is an unsigned long, there is no portable way to do this on 64-bit platforms there is no portable way to do this since it requires a 128-bit intermediate result (which gcc does support on 64-bit platforms but may generate libgcc calls, e.g. on 64-bit s390), but since the output is a 32-bit integer in the cases affected, just simplify the multiply-divide (*3/10 instead of *300/1000). The reciprocal multiply used can have off-by-one errors in the upper half of the valid output range. This could be avoided at the expense of having to deal with a potential 65-bit intermediate result. Since the intent is to avoid overflow problems and most of the other time conversions are only semiexact, the off-by-one errors were considered an acceptable tradeoff. At Ralf Baechle's suggestion, this version uses a Perl script to compute the necessary constants. We already have dependencies on Perl for kernel compiles. This does, however, require the Perl module Math::BigInt, which is included in the standard Perl distribution starting with version 5.8.0. In order to support older versions of Perl, include a table of canned constants in the script itself, and structure the script so that Math::BigInt isn't required if pulling values from said table. Running the script requires that the HZ value is available from the Makefile. Thus, this patch also adds the Kconfig variable CONFIG_HZ to the architectures which didn't already have it (alpha, cris, frv, h8300, m32r, m68k, m68knommu, sparc, v850, and xtensa.) It does *not* touch the sh or sh64 architectures, since Paul Mundt has dealt with those separately in the sh tree. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Ralf Baechle <ralf@linux-mips.org>, Cc: Sam Ravnborg <sam@ravnborg.org>, Cc: Paul Mundt <lethal@linux-sh.org>, Cc: Richard Henderson <rth@twiddle.net>, Cc: Michael Starvik <starvik@axis.com>, Cc: David Howells <dhowells@redhat.com>, Cc: Yoshinori Sato <ysato@users.sourceforge.jp>, Cc: Hirokazu Takata <takata@linux-m32r.org>, Cc: Geert Uytterhoeven <geert@linux-m68k.org>, Cc: Roman Zippel <zippel@linux-m68k.org>, Cc: William L. Irwin <sparclinux@vger.kernel.org>, Cc: Chris Zankel <chris@zankel.net>, Cc: H. Peter Anvin <hpa@zytor.com>, Cc: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Basic PWM driver for AVR32 and AT91David Brownell2008-02-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PWM device setup, and a simple PWM driver exposing a programming interface giving access to each channel's full capabilities. Note that this doesn't support starting several channels in synch. [hskinnemoen@atmel.com: allocate platform device dynamically] [hskinnemoen@atmel.com: Kconfig fix] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Andrew Victor <linux@maxim.org.za> Cc: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>