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* Merge tag 'cris-for-4.1' of ↵Linus Torvalds2015-04-26
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jesper/cris Pull arch/cris updates from Jesper Nilsson: "Some much needed love for the CRIS-port. There's a bunch of changes this time, giving the CRISv32 port a bit of modern makeover with device-tree, irq domain and gpiolib support, and more switchover to generic frameworks. Some small fixes and removal of the theoretical SMP support brings up the rear" * tag 'cris-for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/jesper/cris: cris: fix integer overflow in ELF_ET_DYN_BASE CRISv32: use GENERIC_SCHED_CLOCK CRISv32: use MMIO clocksource CRISv32: use generic clockevents CRIS: use generic headers via Kbuild CRIS: use generic cmpxchg.h CRIS: use generic atomic.h CRIS: use generic atomic bitops CRISv10: remove redundant macros from system.h CRIS: remove SMP code CRISv32: don't enable irqs in INIT_THREAD CRISv32: handle multiple signals CRISv32: prevent bogus restarts on sigreturn CRISv32: don't attempt syscall restart on irq exit Add binding documentation for CRIS CRIS: add Axis 88 board device tree CRISv32: add device tree support CRISv32: add irq domains support CRIS: enable GPIOLIB
| * cris: fix integer overflow in ELF_ET_DYN_BASEAndrey Ryabinin2015-03-25
| | | | | | | | | | | | | | | | | | | | | | | | Almost all arches define ELF_ET_DYN_BASE as 2/3 of TASK_SIZE. Though it seems that some architectures do this in a wrong way. The problem is that 2*TASK_SIZE may overflow 32-bits so the real ELF_ET_DYN_BASE becomes wrong. Fix this overflow by dividing TASK_SIZE prior to multiplying: (TASK_SIZE / 3 * 2) Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: use GENERIC_SCHED_CLOCKRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | Provide a fast sched clock using the free-running timer and the generic sched_clock infrastructure. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: use MMIO clocksourceRabin Vincent2015-03-25
| | | | | | | | | | | | | | Use a generic MMIO clocksource and get rid of some lines of code. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: use generic clockeventsRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | Implement a oneshot-capable clockevents device so we get support for things like hrtimers and NOHZ. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRIS: use generic headers via KbuildRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | Delete headers which do nothing but include the asm-generic versions and use Kbuild magic instead. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRIS: use generic cmpxchg.hRabin Vincent2015-03-25
| | | | | | | | | | | | | | CRIS can use asm-generic's cmpxchg.h Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRIS: use generic atomic.hRabin Vincent2015-03-25
| | | | | | | | | | | | | | CRIS can use asm-generic's atomic.h. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRIS: use generic atomic bitopsRabin Vincent2015-03-25
| | | | | | | | | | | | | | The generic atomic bitops are the same as the CRIS-specific ones. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv10: remove redundant macros from system.hRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | All of these are either unused or already provided by other headers, so they can be removed. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRIS: remove SMP codeRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | The CRIS SMP code cannot be built since there is no (and appears to never have been) a CONFIG_SMP Kconfig option in arch/cris/. Remove it. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: don't enable irqs in INIT_THREADRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | INIT_THREAD enables interrupts in the thread_struct's saved flags. This means that interrupts get enabled in the middle of context_switch() while switching to new tasks that get forked off the init task during boot. Don't do this. Fixes the following splat on boot with spinlock debugging on: BUG: spinlock cpu recursion on CPU#0, swapper/2 lock: runqueues+0x0/0x47c, .magic: dead4ead, .owner: swapper/0, .owner_cpu: 0 CPU: 0 PID: 2 Comm: swapper Not tainted 3.19.0-08796-ga747b55 #285 Call Trace: [<c0032b80>] spin_bug+0x2a/0x36 [<c0032c98>] do_raw_spin_lock+0xa2/0x126 [<c01964b0>] _raw_spin_lock+0x20/0x2a [<c00286c8>] scheduler_tick+0x22/0x76 [<c003db2c>] update_process_times+0x5e/0x72 [<c0007a94>] timer_interrupt+0x4e/0x6a [<c00378d6>] handle_irq_event_percpu+0x54/0xf2 [<c00379c4>] handle_irq_event+0x50/0x74 [<c003988e>] handle_simple_irq+0x6c/0xbe [<c0037270>] generic_handle_irq+0x2a/0x36 [<c0004c40>] do_IRQ+0x38/0x84 [<c000662e>] crisv32_do_IRQ+0x54/0x60 [<c0006204>] IRQ0x4b_interrupt+0x34/0x3c [<c0192baa>] __schedule+0x24a/0x532 [<c00056b4>] ret_from_kernel_thread+0x0/0x14 Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: handle multiple signalsRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Al Viro noted that CRIS fails to handle multiple signals. This fixes the problem for CRISv32 by making it use a C work_pending handling loop similar to the ARM implementation in 0a267fa6a15d41c ("ARM: 7472/1: pull all work_pending logics into C function"). This also happens to fixes the warnings which currently trigger on CRISv32 due to do_signal() being called with interrupts disabled. Test case (should die of the SIGSEGV which gets raised when setting up the stack for SIGALRM, but instead reaches and executes the _exit(1)): #include <unistd.h> #include <signal.h> #include <sys/time.h> #include <err.h> static void handler(int sig) { } int main(int argc, char *argv[]) { int ret; struct itimerval t1 = { .it_value = {1} }; stack_t ss = { .ss_sp = NULL, .ss_size = SIGSTKSZ, }; struct sigaction action = { .sa_handler = handler, .sa_flags = SA_ONSTACK, }; ret = sigaltstack(&ss, NULL); if (ret < 0) err(1, "sigaltstack"); sigaction(SIGALRM, &action, NULL); setitimer(ITIMER_REAL, &t1, NULL); pause(); _exit(1); return 0; } Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Link: http://lkml.kernel.org/r/20121208074429.GC4939@ZenIV.linux.org.uk Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: prevent bogus restarts on sigreturnRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Al Viro noted that CRIS is vulnerable to bogus restarts on sigreturn. The fixes CRISv32 by using regs->exs as an additional indicator to whether we should attempt to restart the syscall or not. EXS is only used in the sigtrap handling, and in that path we already have r9 (the other indicator, which indicates if we're in a syscall or not) cleared. Test case, a port of Al's ARM version from 653d48b22166db2d8 ("arm: fix really nasty sigreturn bug"): #include <unistd.h> #include <signal.h> #include <stdlib.h> #include <sys/time.h> #include <errno.h> void f(int n) { register int r10 asm ("r10") = n; __asm__ __volatile__( "ba 1f \n" "nop \n" "break 8 \n" "1: ba . \n" "nop \n" : : "r" (r10) : "memory"); } void handler1(int sig) { } void handler2(int sig) { raise(1); } void handler3(int sig) { exit(0); } int main(int argc, char *argv[]) { struct sigaction s = {.sa_handler = handler2}; struct itimerval t1 = { .it_value = {1} }; struct itimerval t2 = { .it_value = {2} }; signal(1, handler1); sigemptyset(&s.sa_mask); sigaddset(&s.sa_mask, 1); sigaction(SIGALRM, &s, NULL); signal(SIGVTALRM, handler3); setitimer(ITIMER_REAL, &t1, NULL); setitimer(ITIMER_VIRTUAL, &t2, NULL); f(-513); /* -ERESTARTNOINTR */ return 0; } Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Link: http://lkml.kernel.org/r/20121208074429.GC4939@ZenIV.linux.org.uk Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: don't attempt syscall restart on irq exitRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | r9 is used to determine whether syscall restarting must be performed or not. Unfortunately, r9 is never set to zero in the non-syscall path, and r9 is on top of that a callee-saved register which can be set to non-zero by the C functions that are called during IRQ handling. This means that if r10 (used for the syscall return value) is one of the -ERESTART* values when a hardware interrupt occurs which leads to a signal being delivered to the process, the kernel will "restart" a syscall which never occurred. This will lead to the PC being moved back by 2 on return to user space. Fix the problem by setting r9 to zero in the interrupt path. Test case (should loop forever but ends up executing the break 8 trap instruction): #include <signal.h> #include <stdlib.h> #include <sys/time.h> void f(int n) { register int r9 asm ("r9") = 1; register int r10 asm ("r10") = n; __asm__ __volatile__( "ba 1f \n" "nop \n" "break 8 \n" "1: ba . \n" "nop \n" : : "r" (r9), "r" (r10) : "memory"); } void handler1(int sig) { } int main(int argc, char *argv[]) { struct itimerval t1 = { .it_value = {1} }; signal(SIGALRM, handler1); setitimer(ITIMER_REAL, &t1, NULL); f(-513); /* -ERESTARTNOINTR */ return 0; } Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRIS: add Axis 88 board device treeRabin Vincent2015-03-25
| | | | | | | | | | | | | | | | Add a minimal device tree for the ETRAX FS SoC and the Axis 88 developer board. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jespern@axis.com>
| * CRISv32: add device tree supportRabin Vincent2015-03-25
| | | | | | | | | | | | | | Add support for booting CRISv32 with a built-in device tree. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRISv32: add irq domains supportRabin Vincent2015-03-25
| | | | | | | | | | | | | | Add support for IRQ domains to the CRISv32 interrupt controller. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRIS: enable GPIOLIBRabin Vincent2015-03-25
| | | | | | | | | | | | | | Enable GPIOLIB on CRIS so that we can use the generic GPIO APIs. Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* | Merge branch 'akpm' (patches from Andrew)Linus Torvalds2015-04-15
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Merge second patchbomb from Andrew Morton: - the rest of MM - various misc bits - add ability to run /sbin/reboot at reboot time - printk/vsprintf changes - fiddle with seq_printf() return value * akpm: (114 commits) parisc: remove use of seq_printf return value lru_cache: remove use of seq_printf return value tracing: remove use of seq_printf return value cgroup: remove use of seq_printf return value proc: remove use of seq_printf return value s390: remove use of seq_printf return value cris fasttimer: remove use of seq_printf return value cris: remove use of seq_printf return value openrisc: remove use of seq_printf return value ARM: plat-pxa: remove use of seq_printf return value nios2: cpuinfo: remove use of seq_printf return value microblaze: mb: remove use of seq_printf return value ipc: remove use of seq_printf return value rtc: remove use of seq_printf return value power: wakeup: remove use of seq_printf return value x86: mtrr: if: remove use of seq_printf return value linux/bitmap.h: improve BITMAP_{LAST,FIRST}_WORD_MASK MAINTAINERS: CREDITS: remove Stefano Brivio from B43 .mailmap: add Ricardo Ribalda CREDITS: add Ricardo Ribalda Delgado ...
| * | cris fasttimer: remove use of seq_printf return valueJoe Perches2015-04-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The seq_printf return value, because it's frequently misused, will eventually be converted to void. See: commit 1f33c41c03da ("seq_file: Rename seq_overflow() to seq_has_overflowed() and make public") Miscellanea: o Coalesce formats, realign arguments Signed-off-by: Joe Perches <joe@perches.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * | cris: remove use of seq_printf return valueJoe Perches2015-04-15
| |/ | | | | | | | | | | | | | | | | | | | | | | | | The seq_printf return value, because it's frequently misused, will eventually be converted to void. See: commit 1f33c41c03da ("seq_file: Rename seq_overflow() to seq_has_overflowed() and make public") Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* / arch: Remove exec_domain from remaining archsRichard Weinberger2015-04-12
|/ | | | Signed-off-by: Richard Weinberger <richard@nod.at>
* Merge tag 'cris-for-3.20' of ↵Linus Torvalds2015-02-15
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jesper/cris Pull CRIS changes from Jesper Nilsson. * tag 'cris-for-3.20' of git://git.kernel.org/pub/scm/linux/kernel/git/jesper/cris: CRIS: Whitespace cleanup CRIS: macro whitespace fixes in uaccess.h CRIS: uaccess: fix sparse errors CRISv32: Remove unnecessary KERN_INFO from sync_serial CRIS: Fix missing NR_CPUS in menuconfig CRISv32: Avoid warning of unused variable CRIS: Avoid warning in cris mm/fault.c CRIS: Export csum_partial_copy_nocheck
| * CRIS: Whitespace cleanupJesper Nilsson2015-02-14
| | | | | | | | | | | | No functional change, just clean up the most obvious. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRIS: macro whitespace fixes in uaccess.hMichael S. Tsirkin2015-02-14
| | | | | | | | | | | | | | | | | | | | | | While working on arch/cris/include/asm/uaccess.h, I noticed that some macros within this header are made harder to read because they violate a coding style rule: space is missing after comma. Fix it up. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRIS: uaccess: fix sparse errorsMichael S. Tsirkin2015-02-14
| | | | | | | | | | | | | | | | | | | | | | virtio wants to read bitwise types from userspace using get_user. At the moment this triggers sparse errors, since the value is passed through an integer. Fix that up using __force. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRISv32: Remove unnecessary KERN_INFO from sync_serialMasanari Iida2015-02-14
| | | | | | | | | | | | | | Remove unnecessary KERN_INFO in sync_serial.c Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRIS: Fix missing NR_CPUS in menuconfigJesper Nilsson2015-01-29
| | | | | | | | | | | | | | | | | | The time Kconfig expects that NR_CPUS is defined. This patch removes this config warning: "kernel/time/Kconfig:163:warning: range is invalid" Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRISv32: Avoid warning of unused variableJesper Nilsson2015-01-29
| | | | | | | | | | | | | | | | | | | | Avoids the warning about: warning: 'bite_in_progress' defined but not used [-Wunused-variable] Variable is only used if the Kconfig CONFIG_ETRAX_WATCHDOG_NICE_DOGGY is set. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRIS: Avoid warning in cris mm/fault.cJesper Nilsson2015-01-29
| | | | | | | | | | | | | | Move declaration of waitqueue to beginning of block, avoids warning about mixing declarations and code. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
| * CRIS: Export csum_partial_copy_nocheckJesper Nilsson2015-01-29
| | | | | | | | | | | | | | | | | | Allows that symbol to be used in modules, and fixes the following on allmodconfig: ERROR: "csum_partial_copy_nocheck" [net/ipv6/ipv6.ko] undefined! Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* | all arches, signal: move restart_block to struct task_structAndy Lutomirski2015-02-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If an attacker can cause a controlled kernel stack overflow, overwriting the restart block is a very juicy exploit target. This is because the restart_block is held in the same memory allocation as the kernel stack. Moving the restart block to struct task_struct prevents this exploit by making the restart_block harder to locate. Note that there are other fields in thread_info that are also easy targets, at least on some architectures. It's also a decent simplification, since the restart code is more or less identical on all architectures. [james.hogan@imgtec.com: metag: align thread_info::supervisor_stack] Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: David Miller <davem@davemloft.net> Acked-by: Richard Weinberger <richard@nod.at> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Steven Miao <realmz6@gmail.com> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Tested-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.linux@gmail.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | mm: make FIRST_USER_ADDRESS unsigned long on all archsKirill A. Shutemov2015-02-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | LKP has triggered a compiler warning after my recent patch "mm: account pmd page tables to the process": mm/mmap.c: In function 'exit_mmap': >> mm/mmap.c:2857:2: warning: right shift count >= width of type [enabled by default] The code: > 2857 WARN_ON(mm_nr_pmds(mm) > 2858 round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT); In this, on tile, we have FIRST_USER_ADDRESS defined as 0. round_up() has the same type -- int. PUD_SHIFT. I think the best way to fix it is to define FIRST_USER_ADDRESS as unsigned long. On every arch for consistency. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | cris: drop _PAGE_FILE and pte_file()-related helpersKirill A. Shutemov2015-02-10
| | | | | | | | | | | | | | | | | | | | | | We've replaced remap_file_pages(2) implementation with emulation. Nobody creates non-linear mapping anymore. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | vm: add VM_FAULT_SIGSEGV handling supportLinus Torvalds2015-01-29
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The core VM already knows about VM_FAULT_SIGBUS, but cannot return a "you should SIGSEGV" error, because the SIGSEGV case was generally handled by the caller - usually the architecture fault handler. That results in lots of duplication - all the architecture fault handlers end up doing very similar "look up vma, check permissions, do retries etc" - but it generally works. However, there are cases where the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV. In particular, when accessing the stack guard page, libsigsegv expects a SIGSEGV. And it usually got one, because the stack growth is handled by that duplicated architecture fault handler. However, when the generic VM layer started propagating the error return from the stack expansion in commit fee7e49d4514 ("mm: propagate error from stack expansion even for guard page"), that now exposed the existing VM_FAULT_SIGBUS result to user space. And user space really expected SIGSEGV, not SIGBUS. To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those duplicate architecture fault handlers about it. They all already have the code to handle SIGSEGV, so it's about just tying that new return value to the existing code, but it's all a bit annoying. This is the mindless minimal patch to do this. A more extensive patch would be to try to gather up the mostly shared fault handling logic into one generic helper routine, and long-term we really should do that cleanup. Just from this patch, you can generally see that most architectures just copied (directly or indirectly) the old x86 way of doing things, but in the meantime that original x86 model has been improved to hold the VM semaphore for shorter times etc and to handle VM_FAULT_RETRY and other "newer" things, so it would be a good idea to bring all those improvements to the generic case and teach other architectures about them too. Reported-and-tested-by: Takashi Iwai <tiwai@suse.de> Tested-by: Jan Engelhardt <jengelh@inai.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots" Cc: linux-arch@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2015-01-25
|\ | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs fixes from Al Viro: "A couple of fixes - deadlock in CIFS and build breakage in cris serial driver (resurfaced f_dentry in there)" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: VFS: Convert file->f_dentry->d_inode to file_inode() fix deadlock in cifs_ioctl_clone()
| * VFS: Convert file->f_dentry->d_inode to file_inode()David Howells2015-01-20
| | | | | | | | | | | | | | | | | | | | Convert file->f_dentry->d_inode to file_inode() so as to get layered filesystems right. Found with: git grep '[.>]f_dentry' Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | module: remove mod arg from module_free, rename module_memfree().Rusty Russell2015-01-19
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Nothing needs the module pointer any more, and the next patch will call it from RCU, where the module itself might no longer exist. Removing the arg is the safest approach. This just codifies the use of the module_alloc/module_free pattern which ftrace and bpf use. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Alexei Starovoitov <ast@kernel.org> Cc: Mikael Starvik <starvik@axis.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Ley Foon Tan <lftan@altera.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: x86@kernel.org Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: linux-cris-kernel@axis.com Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: nios2-dev@lists.rocketboards.org Cc: linuxppc-dev@lists.ozlabs.org Cc: sparclinux@vger.kernel.org Cc: netdev@vger.kernel.org
* CRISv32: Remove last remnants of ETRAX_SPI_MMC_BOARDJesper Nilsson2014-12-19
| | | | | | | There are no users of this symbol left. Reported-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRISv32: ETRAXFS: Fix recursive spinlockJesper Nilsson2014-12-19
| | | | | | | | | | Move pinmux alloc/dealloc code into functions that don't take the spinlock so we can use from code that has the spinlock already. CRISv32 has no working SMP, so spinlocks becomes a NOP, so deadlock was never seen. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRISv32: Select MTDRAM for axisflashmapJesper Nilsson2014-12-19
| | | | | | Fixes compile error on allmodconfig. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRISv32: Implement early consoleJesper Nilsson2014-12-19
| | | | Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRIS: Use KALLSYMs if available in call stack dumpJesper Nilsson2014-12-19
| | | | | | Also, print kernel version on oops. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRISv32: Fix declaration mismatchJesper Nilsson2014-12-19
| | | | | | | Drop i2c_init from this header, it was declared non-static here, but static in the C-file. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRISv32: Rewrite of synchronous serial port driverJesper Nilsson2014-12-19
| | | | | | | Make driver possible to load as a module and try to handle locking better. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRIS: Update init memory handlingJesper Nilsson2014-12-19
| | | | | | | | - Add free_initrd_mem as found by Guenter Roeck <linux@roeck-us.net> - Add free_init_pages - Export empty_zero_page symbol Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRISv32: Better handling of watchdog biteJesper Nilsson2014-12-19
| | | | | | | | Don't enter watchdog handling if we're already in watchdog handling. Also some minor formatting tweaks. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRIS: Export missing function symbolsJesper Nilsson2014-12-19
| | | | | | | | | | | | | | | | | strcmp was lost when all other string functions were removed, but we still have an optimized version for this on CRISv32, so any driver built as a module would not have access to this symbol. In a similar manner, we had optimized versions of csum_partial_copy_from_user and __do_clear_user but no exported symbols for them, breaking bunch of other drivers when built as a module. At the same time, move EXPORT_SYMBOL(__copy_user) and EXPORT_SYMBOL(__copy_user_zeroing) C-files so it's located together with the function definition. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
* CRIS: Export ioremap_nocacheJesper Nilsson2014-12-19
| | | | Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
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