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* Merge branch 'for-linus' of ↵Linus Torvalds2011-05-2853-235/+127
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (36 commits) Cache xattr security drop check for write v2 fs: block_page_mkwrite should wait for writeback to finish mm: Wait for writeback when grabbing pages to begin a write configfs: remove unnecessary dentry_unhash on rmdir, dir rename fat: remove unnecessary dentry_unhash on rmdir, dir rename hpfs: remove unnecessary dentry_unhash on rmdir, dir rename minix: remove unnecessary dentry_unhash on rmdir, dir rename fuse: remove unnecessary dentry_unhash on rmdir, dir rename coda: remove unnecessary dentry_unhash on rmdir, dir rename afs: remove unnecessary dentry_unhash on rmdir, dir rename affs: remove unnecessary dentry_unhash on rmdir, dir rename 9p: remove unnecessary dentry_unhash on rmdir, dir rename ncpfs: fix rename over directory with dangling references ncpfs: document dentry_unhash usage ecryptfs: remove unnecessary dentry_unhash on rmdir, dir rename hostfs: remove unnecessary dentry_unhash on rmdir, dir rename hfsplus: remove unnecessary dentry_unhash on rmdir, dir rename hfs: remove unnecessary dentry_unhash on rmdir, dir rename omfs: remove unnecessary dentry_unhash on rmdir, dir rneame udf: remove unnecessary dentry_unhash from rmdir, dir rename ...
| * Cache xattr security drop check for write v2Andi Kleen2011-05-284-4/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some recent benchmarking on btrfs showed that a major scaling bottleneck on large systems on btrfs is currently the xattr lookup on every write. Why xattr lookup on every write I hear you ask? write wants to drop suid and security related xattrs that could set o capabilities for executables. To do that it currently looks up security.capability on EVERY write (even for non executables) to decide whether to drop it or not. In btrfs this causes an additional tree walk, hitting some per file system locks and quite bad scalability. In a simple read workload on a 8S system I saw over 90% CPU time in spinlocks related to that. Chris Mason tells me this is also a problem in ext4, where it hits the global mbcache lock. This patch adds a simple per inode to avoid this problem. We only do the lookup once per file and then if there is no xattr cache the decision. All xattr changes clear the flag. I also used the same flag to avoid the suid check, although that one is pretty cheap. A file system can also set this flag when it creates the inode, if it has a cheap way to do so. This is done for some common file systems in followon patches. With this patch a major part of the lock contention disappears for btrfs. Some testing on smaller systems didn't show significant performance changes, but at least it helps the larger systems and is generally more efficient. v2: Rename is_sgid. add file system helper. Cc: chris.mason@oracle.com Cc: josef@redhat.com Cc: viro@zeniv.linux.org.uk Cc: agruen@linbit.com Cc: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fs: block_page_mkwrite should wait for writeback to finishDarrick J. Wong2011-05-281-0/+1
| | | | | | | | | | | | | | | | | | | | For filesystems such as nilfs2 and xfs that use block_page_mkwrite, modify that function to wait for pending writeback before allowing the page to become writable. This is needed to stabilize pages during writeback for those two filesystems. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * mm: Wait for writeback when grabbing pages to begin a writeDarrick J. Wong2011-05-281-1/+3
| | | | | | | | | | | | | | | | | | | | When grabbing a page for a buffered IO write, the mm should wait for writeback on the page to complete so that the page does not become writable during the IO operation. This change is needed to provide page stability during writes for all filesystems. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * configfs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-2/+0
| | | | | | | | | | | | | | | | configfs does not have problems with references to unlinked directories. CC: Joel Becker <jlbec@evilplan.org> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fat: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-282-10/+0
| | | | | | | | | | | | | | | | fat does not have problems with references to unlinked directories. CC: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * hpfs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | | | | | | | Hpfs has no problems with references to unlinked directories. We leave one dentry_unhash call in place, in hpfs_unlink's strange path where it tries to truncate a file because the disk is full. I'm not sure what the full story is there. CC: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * minix: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | Minix has no issues with references to unlinked directories. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fuse: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | Fuse has no problems with references to unlinked directories. CC: Miklos Szeredi <miklos@szeredi.hu> CC: fuse-devel@lists.sourceforge.net Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * coda: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | | | Coda has no problems with references to unlinked directories. CC: Jan Harkes <jaharkes@cs.cmu.edu> CC: coda@cs.cmu.edu CC: codalist@coda.cs.cmu.edu Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * afs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | afs has no problems with references to unlinked directories. CC: David Howells <dhowells@redhat.com> CC: linux-afs@lists.infradead.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * affs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | affs has no problems with references to unlinked directories. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * 9p: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-4/+0
| | | | | | | | | | | | | | | | | | | | | | 9p has no problems with references to unlinked directories. CC: Eric Van Hensbergen <ericvh@gmail.com> CC: Ron Minnich <rminnich@sandia.gov> CC: Latchesar Ionkov <lucho@ionkov.net> CC: v9fs-developer@lists.sourceforge.net Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * ncpfs: fix rename over directory with dangling referencesSage Weil2011-05-281-1/+9
| | | | | | | | | | | | | | | | | | | | | | ncpfs does not handle references to unlinked directories (or so it would seem given the ncp_rmdir check). Since it is also possible to rename over an empty directory, perform the same check here. CC: Petr Vandrovec <petr@vandrovec.name> CC: linux-kernel@vger.kernel.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * ncpfs: document dentry_unhash usageSage Weil2011-05-281-1/+4
| | | | | | | | | | | | | | | | | | | | ncpfs returns EBUSY if there are any references to the directory. The dentry_unhash call only unhashes the dentry if there are no references. CC: Petr Vandrovec <petr@vandrovec.name> CC: linux-kernel@vger.kernel.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * ecryptfs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | | | ecryptfs does not have problems with references to unlinked directories. CC: Tyler Hicks <tyhicks@linux.vnet.ibm.com> CC: Dustin Kirkland <kirkland@canonical.com> CC: ecryptfs-devel@lists.launchpad.net Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * hostfs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | | | hostfs does not have problems with references to unlinked directories. CC: Jeff Dike <jdike@addtoit.com> CC: Richard Weinberger <richard@nod.at> CC: user-mode-linux-devel@lists.sourceforge.net Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * hfsplus: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-6/+2
| | | | | | | | | | | | | | hfsplus does not have problems with references to unlinked directories. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * hfs: remove unnecessary dentry_unhash on rmdir, dir renameSage Weil2011-05-281-6/+0
| | | | | | | | | | | | | | hfs does not have problems with references to unlinked directories. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * omfs: remove unnecessary dentry_unhash on rmdir, dir rneameSage Weil2011-05-281-8/+3
| | | | | | | | | | | | | | | | | | omfs does not have problems with references to unlinked directories. CC: Bob Copeland <me@bobcopeland.com> CC: linux-karma-devel@lists.sourceforge.net Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * udf: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | udf does not have problems with references to unlinked directories. CC: Jan Kara <jack@suse.cz> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * reiserfs: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-282-6/+0
| | | | | | | | | | | | | | | | Reiserfs does not have problems with references to unlinked directories. CC: reiserfs-devel@vger.kernel.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * ufs: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | ufs does not have problems with references to unlinked directories. CC: Evgeniy Dushistov <dushistov@mail.ru> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * ubifs: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | | | ubifs does not have problems with references to unlinked directories. CC: Artem Bityutskiy <dedekind1@gmail.com> CC: Adrian Hunter <adrian.hunter@nokia.com> CC: linux-mtd@lists.infradead.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * nilfs2: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | nilfs2 does not have problems with references to unlinked directories. CC: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp> CC: linux-nilfs@vger.kernel.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * logfs: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | logfs does not have problems with references to unlinked directories. CC: Joern Engel <joern@logfs.org> CC: logfs@logfs.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * jfs: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | jfs does not have problems with references to unlinked directories. CC: Dave Kleikamp <shaggy@kernel.org> CC: jfs-discussion@lists.sourceforge.net Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * jffs2: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | | | jffs2 does not have problems with references to unlinked directories. CC: David Woodhouse <dwmw2@infradead.org> CC: linux-mtd@lists.infradead.org Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * sysv: remove unnecessary dentry_unhash from rmdir, dir renameSage Weil2011-05-281-5/+0
| | | | | | | | | | | | | | | | sysv does not have problems with references to unlinked directories. CC: Christoph Hellwig <hch@infradead.org> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * bfs: remove unnecessary dentry_unhash on dir renameSage Weil2011-05-281-3/+0
| | | | | | | | | | | | | | | | Bfs does not have problems with references to unlinked directories. CC: tigran@aivazian.fsnet.co.uk Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fs: cosmetic inode.c cleanupsChristoph Hellwig2011-05-271-49/+5
| | | | | | | | | | | | | | | | | | | | Move the lock order description after all the includes, remove several fairly outdated and/or incorrect comments, move Andrea's copyright/changelog to the top where it belongs, remove the pointless filename in the top of the file comment, and remove to useless macros. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * vfs: Improve the bio_add_page() and bio_add_pc_page() descriptionsAndreas Gruenbacher2011-05-271-8/+8
| | | | | | | | | | | | | | | | The descriptions of bio_add_page() and bio_add_pc_page() are slightly inconsistent; improve them. Signed-off-by: Andreas Gruenbacher <agruen@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * xattr: Fix error results for non-existent / invisible attributesAndreas Gruenbacher2011-05-271-6/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Return -ENODATA when trying to read a user.* attribute which cannot exist: user space otherwise does not have a reasonable way to distinguish between non-existent and inaccessible attributes. Likewise, return -ENODATA when an unprivileged process tries to read a trusted.* attribute: to unprivileged processes, those attributes are invisible (listxattr() won't include them). Related to this bug report: https://bugzilla.redhat.com/660613 Signed-off-by: Andreas Gruenbacher <agruen@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * fs: pass exact type of data dirties to ->dirty_inodeChristoph Hellwig2011-05-2719-23/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Tell the filesystem if we just updated timestamp (I_DIRTY_SYNC) or anything else, so that the filesystem can track internally if it needs to push out a transaction for fdatasync or not. This is just the prototype change with no user for it yet. I plan to push large XFS changes for the next merge window, and getting this trivial infrastructure in this window would help a lot to avoid tree interdependencies. Also remove incorrect comments that ->dirty_inode can't block. That has been changed a long time ago, and many implementations rely on it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * Lift the check for automount points into do_lookup()Al Viro2011-05-271-5/+5
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * Trim excessive arguments of follow_mount_rcu()Al Viro2011-05-271-18/+8
| | | | | | | | | | | | | | | | | | | | ... and kill a useless local variable in follow_dotdot_rcu(), while we are at it - follow_mount_rcu(nd, path, inode) *always* assigned value to *inode, and always it had been path->dentry->d_inode (aka nd->path.dentry->d_inode, since it always got &nd->path as the second argument). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * split __follow_mount_rcu() into normal and .. casesAl Viro2011-05-271-9/+26
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds2011-05-2816-1194/+2284
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, asm: Clean up desc.h a bit x86, amd: Do not enable ARAT feature on AMD processors below family 0x12 x86: Move do_page_fault()'s error path under unlikely() x86, efi: Retain boot service code until after switching to virtual mode x86: Remove unnecessary check in detect_ht() x86: Reorder mm_context_t to remove x86_64 alignment padding and thus shrink mm_struct x86, UV: Clean up uv_tlb.c x86, UV: Add support for SGI UV2 hub chip x86, cpufeature: Update CPU feature RDRND to RDRAND
| * | x86, asm: Clean up desc.h a bitIngo Molnar2011-05-271-76/+76
| | | | | | | | | | | | | | | | | | | | | | | | I have looked at this file and found it rather ugly - improve readability a bit. No change in functionality. Link: http://lkml.kernel.org/n/tip-incpt6y26yd8586idx65t9ll@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | x86, amd: Do not enable ARAT feature on AMD processors below family 0x12Boris Ostrovsky2011-05-261-2/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit b87cf80af3ba4b4c008b4face3c68d604e1715c6 added support for ARAT (Always Running APIC timer) on AMD processors that are not affected by erratum 400. This erratum is present on certain processor families and prevents APIC timer from waking up the CPU when it is in a deep C state, including C1E state. Determining whether a processor is affected by this erratum may have some corner cases and handling these cases is somewhat complicated. In the interest of simplicity we won't claim ARAT support on processor families below 0x12 and will go back to broadcasting timer when going idle. Signed-off-by: Boris Ostrovsky <ostr@amd64.org> Link: http://lkml.kernel.org/r/1306423192-19774-1-git-send-email-ostr@amd64.org Tested-by: Boris Petkov <borislav.petkov@amd.com> Cc: Hans Rosenfeld <Hans.Rosenfeld@amd.com> Cc: Andreas Herrmann <Andreas.Herrmann3@amd.com> Cc: Chuck Ebbert <cebbert@redhat.com> Cc: stable@kernel.org # 32.x, 38.x, 39.x Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| * | x86: Move do_page_fault()'s error path under unlikely()KOSAKI Motohiro2011-05-261-15/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Ingo suggested SIGKILL check should be moved into slowpath function. This will reduce the page fault fastpath impact of this recent commit: 37b23e0525d3: x86,mm: make pagefault killable Suggested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: kamezawa.hiroyu@jp.fujitsu.com Cc: minchan.kim@gmail.com Cc: willy@linux.intel.com Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/4DDE0B5C.9050907@jp.fujitsu.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | Merge branch 'linus' into x86/urgentIngo Molnar2011-05-26932-12293/+51041
| |\ \ | | | | | | | | | | | | | | | | | | | | Merge reason: we want to queue up a dependent patch. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | x86, efi: Retain boot service code until after switching to virtual modeMatthew Garrett2011-05-264-3/+55
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | UEFI stands for "Unified Extensible Firmware Interface", where "Firmware" is an ancient African word meaning "Why do something right when you can do it so wrong that children will weep and brave adults will cower before you", and "UEI" is Celtic for "We missed DOS so we burned it into your ROMs". The UEFI specification provides for runtime services (ie, another way for the operating system to be forced to depend on the firmware) and we rely on these for certain trivial tasks such as setting up the bootloader. But some hardware fails to work if we attempt to use these runtime services from physical mode, and so we have to switch into virtual mode. So far so dreadful. The specification makes it clear that the operating system is free to do whatever it wants with boot services code after ExitBootServices() has been called. SetVirtualAddressMap() can't be called until ExitBootServices() has been. So, obviously, a whole bunch of EFI implementations call into boot services code when we do that. Since we've been charmingly naive and trusted that the specification may be somehow relevant to the real world, we've already stuffed a picture of a penguin or something in that address space. And just to make things more entertaining, we've also marked it non-executable. This patch allocates the boot services regions during EFI init and makes sure that they're executable. Then, after SetVirtualAddressMap(), it discards them and everyone lives happily ever after. Except for the ones who have to work on EFI, who live sad lives haunted by the knowledge that someone's eventually going to write yet another firmware specification. [ hpa: adding this to urgent with a stable tag since it fixes currently-broken hardware. However, I do not know what the dependencies are and so I do not know which -stable versions this may be a candidate for. ] Signed-off-by: Matthew Garrett <mjg@redhat.com> Link: http://lkml.kernel.org/r/1306331593-28715-1-git-send-email-mjg@redhat.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: <stable@kernel.org>
| * | | x86: Remove unnecessary check in detect_ht()Nikhil P Rao2011-05-251-7/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch removes a check that causes incorrect scheduler domain setup (SMP instead of SMT) and bootlog warning messages when cpuid extensions for topology enumeration are not supported and the number of processors reported to the OS is smaller than smp_num_siblings. Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Nikhil P Rao <nikhil.rao@intel.com> Link: http://lkml.kernel.org/r/1306343921.19325.1.camel@fedora13 Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | x86: Reorder mm_context_t to remove x86_64 alignment padding and thus shrink ↵Richard Kennedy2011-05-251-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | mm_struct Reorder mm_context_t to remove alignment padding on 64 bit builds shrinking its size from 64 to 56 bytes. This allows mm_struct to shrink from 840 to 832 bytes, so using one fewer cache lines, and getting more objects per slab when using slub. slabinfo mm_struct reports before :- Sizes (bytes) Slabs ----------------------------------- Object : 840 Total : 7 SlabObj: 896 Full : 1 SlabSiz: 16384 Partial: 4 Loss : 56 CpuSlab: 2 Align : 64 Objects: 18 after :- Sizes (bytes) Slabs ---------------------------------- Object : 832 Total : 7 SlabObj: 832 Full : 1 SlabSiz: 16384 Partial: 4 Loss : 0 CpuSlab: 2 Align : 64 Objects: 19 Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Cc: wilsons@start.ca Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Pekka Enberg <penberg@kernel.org> Link: http://lkml.kernel.org/r/1306244999.1999.5.camel@castor.rsk Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | x86, UV: Clean up uv_tlb.cCliff Wickman2011-05-252-899/+1099
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SGI UV's uv_tlb.c driver has become rather hard to read, with overly large functions, non-standard coding style and (way) too long variable, constant and function names and non-obvious code flow sequences. This patch improves the readability and maintainability of the driver significantly, by doing the following strict code cleanups with no side effects: - Split long functions into shorter logical functions. - Shortened some variable and structure member names. - Added special functions for reads and writes of MMR regs with very long names. - Added the 'tunables' table to shortened tunables_write(). - Added the 'stat_description' table to shorten uv_ptc_proc_write(). - Pass fewer 'stat' arguments where it can be derived from the 'bcp' argument. - Function definitions consistent on one line, and inline in few (short) cases. - Moved some small structures and an atomic inline function to the header file. - Moved some local variables to the blocks where they are used. - Updated the copyright date. - Shortened uv_write_global_mmr64() etc. using some aliasing; no line breaks. Renamed many uv_.. functions that are not exported. - Aligned structure fields. [ note that not all structures are aligned the same way though; I'd like to keep the extensive commenting in some of them. ] - Shortened some long structure names. - Standard pass/fail exit from init_per_cpu() - Vertical alignment for mass initializations. - More separation between blocks of code. Tested on a 16-processor Altix UV. Signed-off-by: Cliff Wickman <cpw@sgi.com> Cc: penberg@kernel.org Link: http://lkml.kernel.org/r/E1QOw12-0004MN-Lp@eag09.americas.sgi.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | x86, UV: Add support for SGI UV2 hub chipJack Steiner2011-05-256-238/+1075
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for a new version of the SGI UV hub chip. The hub chip is the node controller that connects multiple blades into a larger coherent SSI. For the most part, UV2 is compatible with UV1. The majority of the changes are in the addresses of MMRs and in a few cases, the contents of MMRs. These changes are the result in changes in the system topology such as node configuration, processor types, maximum nodes, physical address sizes, etc. Signed-off-by: Jack Steiner <steiner@sgi.com> Link: http://lkml.kernel.org/r/20110511175028.GA18006@sgi.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | x86, cpufeature: Update CPU feature RDRND to RDRANDKees Cook2011-05-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Intel manual changed the name of the CPUID bit to match the instruction name. We should follow suit for sanity's sake. (See Intel SDM Volume 2, Table 3-20 "Feature Information Returned in the ECX Register".) [ hpa: we can only do this at this time because there are currently no CPUs with this feature on the market, hence this is pre-hardware enabling. However, Cc:'ing stable so that stable can present a consistent ABI. ] Signed-off-by: Kees Cook <kees.cook@canonical.com> Link: http://lkml.kernel.org/r/20110524232926.GA27728@outflux.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: <stable@kernel.org> v2.6.36-39
* | | | Merge branch 'sched-urgent-for-linus' of ↵Linus Torvalds2011-05-288-27/+65
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed sched: Fix ->min_vruntime calculation in dequeue_entity() sched: Fix ttwu() for __ARCH_WANT_INTERRUPTS_ON_CTXSW sched: More sched_domain iterations fixes
| * | | | cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowedKOSAKI Motohiro2011-05-285-12/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The rule is, we have to update tsk->rt.nr_cpus_allowed if we change tsk->cpus_allowed. Otherwise RT scheduler may confuse. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/4DD4B3FA.5060901@jp.fujitsu.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
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