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2012-04-03APM: fix deadlock in APM_IOC_SUSPEND ioctlNeilBrown
I found the Xorg server on my ARM device stuck in the 'msleep()' loop in apm_ioctl. I suspect it had attempted suspend immediately after resuming and lost a race. During that msleep(10);, a new suspend cycle must have started and changed ->suspend_state to SUSPEND_PENDING, so it was never seen to be SUSPEND_DONE and the loop could never exited. It would have moved on to SUSPEND_ACKTO but never been able to reach SUSPEND_DONE. So change the loop to only run while SUSPEND_ACKED rather than until SUSPEND_DONE. This is much safer. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-04-02Merge branch 'drm-prime-dmabuf-initial' of ↵Linus Torvalds
git://people.freedesktop.org/~airlied/linux Pull dma-buf prime support from Dave Airlie: "This isn't a majorly urgent thing to have, but we'd like to set the stage for working on dma-buf support in the drm drivers for the next merge window, so I'd like to push in the initial submission now so people have something that we can build on top of. The code just introduces the user interface and internal helper functions for drivers to use. We have driver support under development for i915, nouveau, udl on x86 and exynos, omapdrm on arm, which we would be aiming for the next merge window." In the -rc1 announcement I asked for people who would use this to comment on it, and got severa "Yes please" from people for this and for HSI (that I merged earlier). So far crickets on pohmelfs and the DMA-mapping infrastructure. * 'drm-prime-dmabuf-initial' of git://people.freedesktop.org/~airlied/linux: drm: base prime/dma-buf support (v5)
2012-04-02Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds
Pull networking fixes from David Miller: 1) Provide device string properly for USB i2400m wimax devices, also don't OOPS when providing firmware string. From Phil Sutter. 2) Add support for sh_eth SH7734 chips, from Nobuhiro Iwamatsu. 3) Add another device ID to USB zaurus driver, from Guan Xin. 4) Loop index start in pool vector iterator is wrong causing MAC to not get configured in bnx2x driver, fix from Dmitry Kravkov. 5) EQL driver assumes HZ=100, fix from Eric Dumazet. 6) Now that skb_add_rx_frag() can specify the truesize increment separately, do so in f_phonet and cdc_phonet, also from Eric Dumazet. 7) virtio_net accidently uses net_ratelimit() not only on the kernel warning but also the statistic bump, fix from Rick Jones. 8) ip_route_input_mc() uses fixed init_net namespace, oops, use dev_net(dev) instead. Fix from Benjamin LaHaise. 9) dev_forward_skb() needs to clear the incoming interface index of the SKB so that it looks like a new incoming packet, also from Benjamin LaHaise. 10) iwlwifi mistakenly initializes a channel entry as 2GHZ instead of 5GHZ, fix from Stanislav Yakovlev. 11) Missing kmalloc() return value checks in orinoco, from Santosh Nayak. 12) ath9k doesn't check for HT capabilities in the right way, it is checking ht_supported instead of the ATH9K_HW_CAP_HT flag. Fix from Sujith Manoharan. 13) Fix x86 BPF JIT emission of 16-bit immediate field of AND instructions, from Feiran Zhuang. 14) Avoid infinite loop in GARP code when registering sysfs entries. From David Ward. 15) rose protocol uses memcpy instead of memcmp in a device address comparison, oops. Fix from Daniel Borkmann. 16) Fix build of lpc_eth due to dev_hw_addr_rancom() interface being renamed to eth_hw_addr_random(). From Roland Stigge. 17) Make ipv6 RTM_GETROUTE interpret RTA_IIF attribute the same way that ipv4 does. Fix from Shmulik Ladkani. 18) via-rhine has an inverted bit test, causing suspend/resume regressions. Fix from Andreas Mohr. 19) RIONET assumes 4K page size, fix from Akinobu Mita. 20) Initialization of imask register in sky2 is buggy, because bits are "or'd" into an uninitialized local variable. Fix from Lino Sanfilippo. 21) Fix FCOE checksum offload handling, from Yi Zou. 22) Fix VLAN processing regression in e1000, from Jiri Pirko. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (52 commits) sky2: dont overwrite settings for PHY Quick link tg3: Fix 5717 serdes powerdown problem net: usb: cdc_eem: fix mtu net: sh_eth: fix endian check for architecture independent usb/rtl8150 : Remove duplicated definitions rionet: fix page allocation order of rionet_active via-rhine: fix wait-bit inversion. ipv6: Fix RTM_GETROUTE's interpretation of RTA_IIF to be consistent with ipv4 net: lpc_eth: Fix rename of dev_hw_addr_random net/netfilter/nfnetlink_acct.c: use linux/atomic.h rose_dev: fix memcpy-bug in rose_set_mac_address Fix non TBI PHY access; a bad merge undid bug fix in a previous commit. net/garp: avoid infinite loop if attribute already exists x86 bpf_jit: fix a bug in emitting the 16-bit immediate operand of AND bonding: emit event when bonding changes MAC mac80211: fix oper channel timestamp updation ath9k: Use HW HT capabilites properly MAINTAINERS: adding maintainer for ipw2x00 net: orinoco: add error handling for failed kmalloc(). net/wireless: ipw2x00: fix a typo in wiphy struct initilization ...
2012-04-02sky2: dont overwrite settings for PHY Quick linkLino Sanfilippo
This patch corrects a bug in function sky2_open() of the Marvell Yukon 2 driver in which the settings for PHY quick link are overwritten. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Acked-by: Stephen Hemminger <shemminger@vyattta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-02Merge branch 'paul' (Fixups from Paul Gortmaker)Linus Torvalds
This merges some of the fixes from Paul Gortmaker for the header file cleanup fallout. Some of the patches are going through arch maintainer trees, and David Howells suggested another be done differently, but this at least fixes a few cases. * emailed from Paul Gortmaker <paul.gortmaker@windriver.com>: asm-generic: add linux/types.h to cmpxchg.h firewire: restore the device.h include in linux/firewire.h frv: fix warnings in mb93090-mb00/pci-dma.c about implicit EXPORT_SYMBOL parisc: fix missing cmpxchg file error from system.h split blackfin: fix cmpxchg build fails from system.h fallout avr32: fix build failures from mis-naming of atmel_nand.h ARM: mach-msm: fix compile fail from system.h fallout irq_work: fix compile failure on MIPS from system.h split
2012-04-02tg3: Fix 5717 serdes powerdown problemMatt Carlson
If port 0 of a 5717 serdes device powers down, it hides the phy from port 1. This patch works around the problem by keeping port 0's phy powered up. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-02asm-generic: add linux/types.h to cmpxchg.hPaul Gortmaker
Builds of the openrisc or1ksim_defconfig show the following: In file included from arch/openrisc/include/generated/asm/cmpxchg.h:1:0, from include/asm-generic/atomic.h:18, from arch/openrisc/include/generated/asm/atomic.h:1, from include/linux/atomic.h:4, from include/linux/dcache.h:4, from fs/notify/fsnotify.c:19: include/asm-generic/cmpxchg.h: In function '__xchg': include/asm-generic/cmpxchg.h:34:20: error: expected ')' before 'u8' include/asm-generic/cmpxchg.h:34:20: warning: type defaults to 'int' in type name and many more lines of similar errors. It seems specific to the or32 because most other platforms have an arch specific component that would have already included types.h ahead of time, but the o32 does not. Cc: Arnd Bergmann <arnd@arndb.de> Cc: Jonas Bonn <jonas@southpole.se> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: David Howells <dhowells@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02firewire: restore the device.h include in linux/firewire.hPaul Gortmaker
Commit 313162d0b838 ("device.h: audit and cleanup users in main include dir") exchanged an include <linux/device.h> for a struct *device but in actuality I misread this file when creating 313162d and it should have remained an include. There were no build regressions since all consumers were already getting device.h anyway, but make it right regardless. Reported-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02frv: fix warnings in mb93090-mb00/pci-dma.c about implicit EXPORT_SYMBOLPaul Gortmaker
To fix: arch/frv/mb93090-mb00/pci-dma.c:31:1: warning: data definition has no type or storage class [enabled by default] arch/frv/mb93090-mb00/pci-dma.c:31:1: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL' [-Wimplicit-int] arch/frv/mb93090-mb00/pci-dma.c:31:1: warning: parameter names (without types) in function declaration [enabled by default] arch/frv/mb93090-mb00/pci-dma.c:38:1: warning: data definition has no type or storage class [enabled by default] Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02parisc: fix missing cmpxchg file error from system.h splitPaul Gortmaker
Commit b4816afa3986 ("Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h") introduced the concept of asm/cmpxchg.h but the parisc arch never got one. Fork the cmpxchg content out of the asm/atomic.h file to create one. Some minor whitespace fixups were done on the block of code that created the new file. Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02blackfin: fix cmpxchg build fails from system.h falloutPaul Gortmaker
Commit 3bed8d67469c ("Disintegrate asm/system.h for Blackfin [ver #2]") introduced arch/blackfin/include/asm/cmpxchg.h but has it also including the asm-generic one which causes this: CC arch/blackfin/kernel/asm-offsets.s In file included from arch/blackfin/include/asm/cmpxchg.h:125:0, from arch/blackfin/include/asm/atomic.h:10, from include/linux/atomic.h:4, from include/linux/spinlock.h:384, from include/linux/seqlock.h:29, from include/linux/time.h:8, from include/linux/timex.h:56, from include/linux/sched.h:57, from arch/blackfin/kernel/asm-offsets.c:10: include/asm-generic/cmpxchg.h:24:15: error: redefinition of '__xchg' arch/blackfin/include/asm/cmpxchg.h:82:29: note: previous definition of '__xchg' was here make[2]: *** [arch/blackfin/kernel/asm-offsets.s] Error 1 It really only needs two simple defines from asm-generic, so just use those instead. Cc: Bob Liu <lliubbo@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02avr32: fix build failures from mis-naming of atmel_nand.hPaul Gortmaker
Commit bf4289cba02b ("ATMEL: fix nand ecc support") indicated that it wanted to "Move platform data to a common header include/linux/platform_data/atmel_nand.h" and the new header even had re-include protectors with: #ifndef __ATMEL_NAND_H__ However, the file that was added was simply called atmel.h and this caused avr32 defconfig to fail with: In file included from arch/avr32/boards/atstk1000/setup.c:22: arch/avr32/mach-at32ap/include/mach/board.h:10:44: error: linux/platform_data/atmel_nand.h: No such file or directory In file included from arch/avr32/boards/atstk1000/setup.c:22: arch/avr32/mach-at32ap/include/mach/board.h:121: warning: 'struct atmel_nand_data' declared inside parameter list arch/avr32/mach-at32ap/include/mach/board.h:121: warning: its scope is only this definition or declaration, which is probably not what you want make[2]: *** [arch/avr32/boards/atstk1000/setup.o] Error 1 It seems the scope of the file contents will expand beyond just nand, so ignore the original intention, and fix up the users who reference the bad name with the _nand suffix. CC: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> CC: David Woodhouse <dwmw2@infradead.org> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02ARM: mach-msm: fix compile fail from system.h falloutPaul Gortmaker
To fix: In file included from arm/boot/compressed/misc.c:28:0: arm/mach-msm/include/mach/uncompress.h: In function 'putc': arch/arm/mach-msm/include/mach/uncompress.h:48:3: error: implicit declaration of function 'smp_mb' [-Werror=implicit-function-declaration] The putc does a cpu_relax which for this platform is smp_mb. Bisect indicates the 1st failing commit as: 0195c00244dc ("Merge tag 'split-asm_system_h...") Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: David Howells <dhowells@redhat.com> Acked-by: David Brown <davidb@codeaurora.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-02drivers/net/ethernet/tile: fix netdev_alloc_skb() bombingChris Metcalf
Commit dae2e9f430c46c29e3f771110094bd3da3625aa4 changed dev_alloc_skb() to netdev_alloc_skb(), adding a dev pointer, but erroneously used "->" instead of "." for a struct member when accessing the dev pointer. This change fixes the build breakage. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsiLinus Torvalds
Pull HSI (High Speed Synchronous Serial Interface) framework from Carlos Chinea: "The High Speed Synchronous Serial Interface (HSI) is a serial interface mainly used for connecting application engines (APE) with cellular modem engines (CMT) in cellular handsets. The framework is currently being used for some people and we would like to see it integrated into the kernel for 3.3. There is no HW controller drivers in this pull, but some people have already some of them pending which they would like to push as soon as this integrated. I am also working on the acceptance for an TI OMAP one, based on a compatible legacy version of the interface called SSI." Ok, so it didn't get into 3.3, but here it is pulled into 3.4. Several people piped up to say "yeah, we want this". * 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi: HSI: hsi_char: Update ioctl-number.txt HSI: Add HSI API documentation HSI: hsi_char: Add HSI char device kernel configuration HSI: hsi_char: Add HSI char device driver HSI: hsi: Introducing HSI framework
2012-04-02Merge branch 'rc-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull 'make cscope' fix from Michal Marek: "The kbuild.git#misc pull request introduced a bug that broke make cscope. Apparently, both the original author and me only tested the use case that the commit was supposed to improve (make tags/TAGS), and not the use case that was not supposed (make cscope)." * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: tags.sh: Add missing quotes
2012-04-02Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds
Pull crypto fixes from Herbert Xu: - Fix for CPU hotplug hang in padata. - Avoid using cpu_active inappropriately in pcrypt and padata. - Fix for user-space algorithm lookup hang with IV generators. - Fix for netlink dump of algorithms where stuff went missing due to incorrect calculation of message size. * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: user - Fix size of netlink dump message crypto: user - Fix lookup of algorithms with IV generator crypto: pcrypt - Use the online cpumask as the default padata: Fix cpu hotplug padata: Use the online cpumask as the default padata: Add a reference to the api documentation
2012-04-02Merge branch 'merge' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc Pull powerpc fixes from Benjamin Herrenschmidt: "This contains a couple more fixes for the system.h disintegration, a trivial section mismatch fix, a couple of patches from akpm that I didn't quite get he expected me to pickup, and a few more trivialities form Kumar that he appear to have forgotten to send me in the previous batch." * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc/eeh: Fix use of set_current_state() in eeh event handling set_current_state() wart powerpc/eeh: Remove eeh_event_handler()->daemonize() powerpc/kvm: Fallout from system.h disintegration powerpc: Fix fallout from system.h split up powerpc: Mark const init data with __initconst instead of __initdata powerpc/qe: Update the SNUM table for MPC8569 Rev2.0 powerpc/dts: Removed fsl,msi property from dts. powerpc/epapr: add "memory" as a clobber to all hypercalls powerpc/85xx: Enable I2C_CHARDEV and I2C_MPC options in defconfigs powerpc/85xx: add the P1020UTM-PC DTS support powerpc/85xx: add the P1020MBG-PC DTS support powerpc/8xxx: remove 85xx/86xx restrictions from fsl_guts.h
2012-04-02MAINTAINERS: update EDAC informationChris Metcalf
The bluesmoke mailing list no longer works, so use linux-edac@vger.kernel.org. And, use a less restrictive pattern so all drivers/edac changes go to linux-edac as well. Borislav suggested I just push this through the tile tree since there is currently no core edac maintainer (emails to Doug Thompson bounce). Acked-by: Borislav Petkov <bp@amd64.org> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02tilepro ethernet driver: fix a few minor issuesChris Metcalf
This commit fixes a number of issues seen with the driver: - Improve handling of return credits to the hardware shim - Use skb_frag_size() appropriately - Fix driver so it works properly with netpoll for console over UDP Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02tile-srom.c driver: minor code cleanupChris Metcalf
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02edac: say "TILEGx" not "TILEPro" for the tilegx edac driverChris Metcalf
This is just an aesthetic change but it was silly to say TILEPro when booting up on the tilegx architecture. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: avoid accidentally unmasking NMI-type interrupt accidentallyChris Metcalf
The return path as we reload registers and core state requires that r30 hold a boolean indicating whether we are returning from an NMI, but in a couple of cases we weren't setting this properly, with the result that we could accidentally unmask the NMI interrupt(s), which could cause confusion. Now we set r30 in every place where we jump into the interrupt return path. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: remove bogus performance optimizationChris Metcalf
We were re-homing the initial task's kernel stack on the boot cpu, but in fact it's better to let it stay globally homed, since that task isn't bound to the boot cpu anyway. This is more of a general cleanup than an actual performance optimization, but it removes code, which is a good thing. :-) Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: return SIGBUS for addresses that are unaligned AND invalidChris Metcalf
Previously we were returning SIGSEGV in this case. It seems cleaner to return SIGBUS since the hardware figures out alignment traps before TLB violations, so SIGBUS is the "more correct" signal. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix finv_buffer_remote() for tilegxChris Metcalf
There were some correctness issues with this code that are now fixed with this change. The change is likely less performant than it could be, but it should no longer be vulnerable to any races with memory operations on the memory network while invalidating a range of memory. This code is run infrequently so performance isn't critical, but correctness definitely is. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: use atomic exchange in arch_write_unlock()Chris Metcalf
This idiom is used elsewhere when we do an unlock by writing a zero, but I missed it here. Using an atomic operation avoids waiting on the write buffer for the unlocking write to be sent to the home cache. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: stop mentioning the "kvm" subdirectoryChris Metcalf
It causes "make clean" to fail, for example. Once we have KVM support complete, we'll reinstate the subdir reference. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: export the page_home() function.Chris Metcalf
This avois a bug in modules trying to use the function. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix pointer cast in cacheflush.cChris Metcalf
Pragmatically it couldn't be wrong to cast pointers to long to compare them (since all kernel addresses are in the top half of VA space), but it's more correct to cast to unsigned long. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix single-stepping over swint1 instructions on tilegxChris Metcalf
If we are single-stepping and make a syscall, we call ptrace_notify() explicitly on the return path back to user space, since we are returning to a pc value set artificially to the next instruction, and otherwise we won't register that we stepped over the syscall instruction (swint1). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: implement panic_smp_self_stop()Chris Metcalf
This allows the later-panicking tiles to wait in a lower power state until they get interrupted with an smp_send_stop(). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: add "nop" after "nap" to help GX idle power drawChris Metcalf
This avoids the hardware istream prefetcher doing unnecessary work. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: use proper memparse() for "maxmem" optionsChris Metcalf
This is more standard and avoids having to remember what units the options actually take. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix up locking in pgtable.c slightlyChris Metcalf
We should be holding the init_mm.page_table_lock in shatter_huge_page() since we are modifying the kernel page tables. Then, only if we are walking the other root page tables to update them, do we want to take the pgd_lock. Add a comment about taking the pgd_lock that we always do it with interrupts disabled and therefore are not at risk from the tlbflush IPI deadlock as is seen on x86. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't leak kernel memory when we unload modulesChris Metcalf
We were failing to track the memory when we allocated it. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix bug in delay_backoff()Chris Metcalf
We were carefully computing a value to use for the number of loops to spin for, and then ignoring it. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix bug in loading kernels larger than 16 MBChris Metcalf
Previously we only handled kernels up to a single huge page in size. Now we create additional PTEs appropriately. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't enable irqs unconditionally in page fault handlerChris Metcalf
If we took a page fault while we had interrupts disabled, we shouldn't enable them in the page fault handler. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't set the homecache of a PTE unless appropriateChris Metcalf
We make sure not to try to set the home for an MMIO PTE (on tilegx) or a PTE that isn't referencing memory managed by Linux. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: don't wait for migrating PTEs in an NMI handlerChris Metcalf
Doing so raises the possibility of self-deadlock if we are waiting for a backtrace for an oprofile or perf interrupt while we are in the middle of migrating our own stack page. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile/Makefile: use KCFLAGS when figuring out the libgcc path.Chris Metcalf
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix a couple of comments that needed updatingChris Metcalf
Not associated with any code changes, so I'm just lumping these comment changes into a commit by themselves. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix up some minor trap handling issuesChris Metcalf
We now respond to MEM_ERROR traps (e.g. an atomic instruction to non-cacheable memory) with a SIGBUS. We also no longer generate a console crash message if a user process die due to a SIGTRAP. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: work around a hardware issue with the return-address stackChris Metcalf
In certain circumstances we need to do a bunch of jump-and-link instructions to fill the hardware return-address stack with nonzero values. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: various bugs in stack backtracerChris Metcalf
Fix a long-standing bug in the stack backtracer where we would print garbage to the console instead of kernel function names, if the kernel wasn't built with symbol support (e.g. mboot). Make sure to tag every line of userspace backtrace output if we actually have the mmap_sem, since that way if there's no tag, we know that it's because we couldn't trylock the semaphore. Stop doing a TLB flush and examining page tables during backtrace. Instead, just trust that __copy_from_user_inatomic() will properly fault and return a failure, which it should do in all cases. Fix a latent bug where the backtracer would directly examine a signal context in user space, rather than copying it safely to kernel memory first. This meant that a race with another thread could potentially have caused a kernel panic. Guard against unaligned sp when trying to restart backtrace at an interrupt or signal handler point in the kernel backtracer. Report kernel symbolic information for the call instruction rather than for the following instruction. We still report the actual numeric address corresponding to the instruction after the call, for the sake of consistency with the normal expectations for stack backtracers. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: make sure to build memcpy_user_64 without frame pointerChris Metcalf
Add a comment explaining why this is important, and add a CFLAGS_REMOVE clause to the Makefile to make sure it happens. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: avoid false corrupt frame warning in early bootChris Metcalf
With lockstat we can end up trying to get a backtrace before "high_memory" is initialized, so don't worry about range testing if it is zero. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: use 0 for IRQ_RESCHEDULE instead of 1Chris Metcalf
This avoids assigning IRQ 0 to PCI devices, because we've seen that doesn't always work well. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-04-02arch/tile: fix gcc 4.6 warnings in <asm/bitops_64.h>Chris Metcalf
Fix some signedness and variable usage warnings in change_bit() and test_and_change_bit(). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>