- 08 Feb, 2008 40 commits
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Eric Sandeen authored
do_mount() uses a whopping 616 bytes of stack on x86_64 in 2.6.24-mm1, largely thanks to gcc inlining the various helper functions. noinlining these can slim it down a lot; on my box this patch gets it down to 168, which is mostly the struct nameidata nd; left on the stack. These functions are called only as do_mount() helpers; none of them should be in any path that would see a performance benefit from inlining... Signed-off-by:
Eric Sandeen <sandeen@redhat.com> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Jeff Dike authored
[ 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:
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Jeff Dike authored
%fs needs to be copied from parent to child during fork. Tidied up some whitespace while I was here. Signed-off-by:
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Jim Meyering authored
* 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:
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Jeff Dike authored
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:
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Jeff Dike authored
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:
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Martin Schwidefsky authored
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:
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Andy Whitcroft authored
This version brings the remainder of the queued fixes. A number of fixes for items missed reported by Andrew Morton and others. Also a handful of new checks and fixes for false positives. Of note: - new warning associated with --file to try and avoid cleanup only patches, - corrected handling of completly empty files, - corrected report handling with multiple files, - handling of possible types in the face of multiple declarations, - detection of unnessary braces on complex if statements (where present), and - all new comment spacing handling. Andi Kleen (1): Introduce a warning when --file mode is used Andy Whitcroft (14): Version: 0.14 clean up some space violations in checkpatch.pl a completly empty file should not provoke a whinge reset report lines buffers between files unary ++/-- may abutt close braces __typeof__ is also unary comments: revamp comment handling add --summary-file option adding filename to summary line trailing backslashes are not trailing statements handle operators passed as parameters such as to ASSERTCMP possible types -- enhance debugging check for boolean operations with constants possible types: handle multiple declarations detect and report if statements where all branches are single statements Arjan van de Ven (1): quiet option should not print the summary on no errors Bartlomiej Zolnierkiewicz (1): warn about using __FUNCTION__ Timur Tabi (1): loosen spacing checks for __asm__ Signed-off-by:Andy Whitcroft <apw@shadowen.org> Signed-off-by:
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Ralf Baechle authored
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:
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Ralf Baechle authored
Probing non-ISA interrupts using the handle_percpu_irq as their handle_irq method may crash the system because handle_percpu_irq does not check IRQ_WAITING. This for example hits the MIPS Qemu configuration. This patch provides two helper functions set_irq_noprobe and set_irq_probe to set rsp. clear the IRQ_NOPROBE flag. The only current caller is MIPS code but this really belongs into generic code. As an aside, interrupt probing these days has become a mostly obsolete if not dangerous art. I think Linux interrupts should be changed to default to non-probing but that's subject of this patch. Signed-off-by:
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Denis Cheng authored
There is an outdated comment in serial_core.c also fixed. Signed-off-by:
Denis Cheng <crquan@gmail.com> Signed-off-by:
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Patrick McHardy authored
Signed-off-by:
Patrick McHardy <kaber@trash.net> Acked-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by:
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Jan Kara authored
There are two possible races in handling of private_list in buffer cache. 1) When fsync_buffers_list() processes a private_list, it clears b_assoc_mapping and moves buffer to its private list. Now drop_buffers() comes, sees a buffer is on list so it calls __remove_assoc_queue() which complains about b_assoc_mapping being cleared (as it cannot propagate possible IO error). This race has been actually observed in the wild. 2) When fsync_buffers_list() processes a private_list, mark_buffer_dirty_inode() can be called on bh which is already on the private list of fsync_buffers_list(). As buffer is on some list (note that the check is performed without private_lock), it is not readded to the mapping's private_list and after fsync_buffers_list() finishes, we have a dirty buffer which should be on private_list but it isn't. This race has not been reported, probably because most (but not all) callers of mark_buffer_dirty_inode() hold i_mutex and thus are serialized with fsync(). Fix these issues by not clearing b_assoc_map when fsync_buffers_list() moves buffer to a dedicated list and by reinserting buffer in private_list when it is found dirty after we have submitted buffer for IO. We also change the tests whether a buffer is on a private list from !list_empty(&bh->b_assoc_buffers) to bh->b_assoc_map so that they are single word reads and hence lockless checks are safe. Signed-off-by:
Jan Kara <jack@suse.cz> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by:
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Yinghai Lu authored
So we can use them for the early console like console=uart8250 or earlycon=uart8250 or early_printk Signed-off-by:
Yinghai Lu <yinghai.lu@sun.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Yi Yang authored
Currently, for every sysfs node, the callers will be responsible for implementing store operation, so many many callers are doing duplicate things to validate input, they have the same mistakes because they are calling simple_strtol/ul/ll/uul, especially for module params, they are just numeric, but you can echo such values as 0x1234xxx, 07777888 and 1234aaa, for these cases, module params store operation just ignores succesive invalid char and converts prefix part to a numeric although input is acctually invalid. This patch tries to fix the aforementioned issues and implements strict_strtox serial functions, kernel/params.c uses them to strictly validate input, so module params will reject such values as 0x1234xxxx and returns an error: write error: Invalid argument Any modules which export numeric sysfs node can use strict_strtox instead of simple_strtox to reject any invalid input. Here are some test results: Before applying this patch: [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0x1000 > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0x1000g > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0x1000gggggggg > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 010000 > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0100008 > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 010000aaaaa > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# After applying this patch: [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0x1000 > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0x1000g > /sys/module/e1000/parameters/copybreak -bash: echo: write error: Invalid argument [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo 0x1000gggggggg > /sys/module/e1000/parameters/copybreak -bash: echo: write error: Invalid argument [root@yangyi-dev /]# echo 010000 > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# echo 0100008 > /sys/module/e1000/parameters/copybreak -bash: echo: write error: Invalid argument [root@yangyi-dev /]# echo 010000aaaaa > /sys/module/e1000/parameters/copybreak -bash: echo: write error: Invalid argument [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# echo -n 4096 > /sys/module/e1000/parameters/copybreak [root@yangyi-dev /]# cat /sys/module/e1000/parameters/copybreak 4096 [root@yangyi-dev /]# [akpm@linux-foundation.org: fix compiler warnings] [akpm@linux-foundation.org: fix off-by-one found by tiwai@suse.de] Signed-off-by:
Yi Yang <yi.y.yang@intel.com> Cc: Greg KH <greg@kroah.com> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Takashi Iwai <tiwai@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Randy Dunlap authored
Fix gcc warnings in getdelays.c: Documentation/accounting/getdelays.c: In function 'task_context_switch_counts': Documentation/accounting/getdelays.c:214: warning: format '%15lu' expects type 'long unsigned int', but argument 4 has type '__u64' Documentation/accounting/getdelays.c:214: warning: format '%15lu' expects type 'long unsigned int', but argument 5 has type '__u64' Documentation/accounting/getdelays.c: In function 'main': Documentation/accounting/getdelays.c:402: warning: format '%d' expects type 'int', but argument 2 has type 'long unsigned int' Documentation/accounting/getdelays.c: In function 'get_family_id': Documentation/accounting/getdelays.c:171: warning: 'id' may be used uninitialized in this function One warning is not a problem and can be dismissed: Documentation/accounting/getdelays.c: In function 'main': Documentation/accounting/getdelays.c:236: warning: 'cmd_type' may be used uninitialized in this function Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Acked-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by:
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Sam Ravnborg authored
Fix following warning: WARNING: o-x86_64/kernel/built-in.o(.text+0x36d8b): Section mismatch in reference from the function enable_nonboot_cpus() to the function .cpuinit.text:_cpu_up() enable_nonboot_cpus() are used solely from CONFIG_CONFIG_PM_SLEEP_SMP=y and PM_SLEEP_SMP imply HOTPLUG_CPU therefore the reference to _cpu_up() is valid. Annotate enable_nonboot_cpus() with __ref to silence modpost. Signed-off-by:
Sam Ravnborg <sam@ravnborg.org> Cc: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by:
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Mike Frysinger authored
Since this header is exported to userspace and all the other types in the header have been scrubbed, this brings the last straggler in line. Signed-off-by:
Mike Frysinger <vapier@gentoo.org> Signed-off-by:
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Andi Kleen authored
Following the deprecation schedule the a.out ELF interpreter support is removed now with this patch. a.out ELF interpreters were an transition feature for moving a.out systems to ELF, but they're unlikely to be still needed. Pure a.out systems will still work of course. This allows to simplify the hairy ELF loader. Signed-off-by:
Andi Kleen <ak@suse.de> Cc: David Howells <dhowells@redhat.com> Signed-off-by:
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Pavel Emelyanov authored
The proper behavior to store task's pid and get this task later is to get the struct pid pointer and get the task with the pid_task() call. Make it for rt_mutex_waiter->deadlock_task_pid field. Signed-off-by:
Pavel Emelyanov <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Pavel Emelyanov authored
All the functions that need to lookup a task by pid in posix timers obtain this pid from a user space, and thus this value refers to a task in the same namespace, as the current task lives in. So the proper behavior is to call find_task_by_vpid() here. Signed-off-by:
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Paul Clements authored
Remove the arbitrary 128 device limit for NBD. nbds_max can now be set to any number. In certain scenarios where devices are used sparsely we have run into the 128 device limit. Signed-off-by:
Paul Clements <paul.clements@steeleye.com> Signed-off-by:
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Jiri Slaby authored
Instead of testing hardcoded values, use pci_match_id to reference the pci_device_id table. Sideways, it allows easy new additions to the table. [akpm@linux-foundation.org: remove wrongly-added semicolon] Signed-off-by:
Jiri Slaby <jirislaby@gmail.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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Jiri Slaby authored
Use pci_resource_start instead of accessing pci_dev struct internals. Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to udf. Signed-off-by:
Miklos Szeredi <mszeredi@suse.cz> Acked-by:
Cyrill Gorcunov <gorcunov@gmail.com> Acked-by:
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Andrew Morton authored
Documentation/SubmitCheckist, please. Cc: Hugh Dickins <hugh@veritas.com> Cc: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by:
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akpm@linux-foundation.org authored
Add .show_options super operation to tmpfs. Signed-off-by:
Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Miklos Szeredi authored
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:
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Miklos Szeredi authored
Add a .show_options super operation to reiserfs. Use generic_show_options() and save the complete option string in reiserfs_fill_super() and reiserfs_remount(). Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to ncpfs. Small fix: add FS_BINARY_MOUNTDATA to the filesystem type flags, since it can take binary data, as well as text (similarly to NFS). Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to isofs. Use generic_show_options() and save the complete option string in isofs_fill_super(). Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to hugetlbfs. Use generic_show_options() and save the complete option string in hugetlbfs_fill_super(). Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to hpfs. Use generic_show_options() and save the complete option string in hpfs_fill_super() and hpfs_remount_fs(). Also add a small fix: hpfs_remount_fs() should return -EINVAL on error, instead of 1, which is not an error value. Signed-off-by:
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Miklos Szeredi authored
Add the "host path" option to /proc/mounts for UML hostfs filesystems. The mount source (mnt_devname) should really be used for this, but not easy to change now in a backward compatible way. Signed-off-by:
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Miklos Szeredi authored
Add blksize= option to /proc/mounts for fuseblk filesystems. Signed-off-by:
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Miklos Szeredi authored
Add flush option to /proc/mounts for msdos and vfat filesystems. Signed-off-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by:
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Miklos Szeredi authored
Add noreservation option to /proc/mounts for ext2 filesystems. Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to devpts. Small cleanup: when parsing the "mode" option, mask with S_IALLUGO instead of ~S_IFMT. Signed-off-by:
H. Peter Anvin <hpa@zytor.com> Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to capifs. Use generic_show_options() and save the complete option string in capifs_remount(). Signed-off-by:
Karsten Keil <kkeil@suse.de> Signed-off-by:
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Miklos Szeredi authored
Add a .show_options super operation to befs. Use generic_show_options() and save the complete option string in befs_fill_super(). Signed-off-by:
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