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* MIPS: math-emu: Get rid of the useless parts of exception handling.Ralf Baechle2014-05-2332-263/+92
| | | | | | All it really did was throw a printk for no obvious reason. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Move various objects into an ar library.Ralf Baechle2014-05-233-7/+8
| | | | | | | | | | | | | | | ieee754d.o contains only debug code and dp_sqrt.o and sp_sqrt.o contain code which for MIPS I/II/III systems we don't want to link. Again the savings can be considerable for some systems: $ mips-linux-size --totals ieee754d.o dp_sqrt.o sp_sqrt.o text data bss dec hex filename 1624 0 0 1624 658 ieee754d.o 2016 0 0 2016 7e0 dp_sqrt.o 736 0 0 736 2e0 sp_sqrt.o 4376 0 0 4376 1118 (TOTALS) Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Inline ieee754sp_issnan and ieee754dp_issnan.Ralf Baechle2014-05-234-4/+2
| | | | | | Shaves another 16 bytes off but more importantly avoids function calls. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Remove unused code.Ralf Baechle2014-05-2321-699/+6
| | | | | | Shrinks the FPU emulator by 4528 bytes. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Remove unused ieee754sp_bestnan() and ieee754dp_bestnan().Ralf Baechle2014-05-234-26/+0
| | | | | | | Both are unused since lmo commit fdffbafbb38723618626c70ffdc6ff9175cdffa2 [Lots of FPU bug fixes from Kjeld Borch Egevang.] Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Inline ieee754dp_finite and ieee754dp_finite().Ralf Baechle2014-05-235-12/+10
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Eleminate duplicate definitions of identical macros.Ralf Baechle2014-05-238-63/+33
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Use SPSIGN() rather than DPSIGN() in ieee754sp_sub().Ralf Baechle2014-05-231-1/+1
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Replace DP_MBITS with DP_FBITS and SP_MBITS with SP_FBITS.Ralf Baechle2014-05-2325-100/+100
| | | | | | | Both were defined as 23 rsp. 52 though the mentissa is actually a bit more than the fraction. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Call ieee754di_xcpt, not ieee754si_xcpt in ieee754dp_cmp.Ralf Baechle2014-05-231-1/+1
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Cleanup stdarg usage including apparently bogus comment.Ralf Baechle2014-05-234-8/+4
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Remove #if 1 and dead code from its #else branch.Ralf Baechle2014-05-231-10/+0
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Cleanup ieee754si_indef() / ieee754di_indef().Ralf Baechle2014-05-231-6/+10
| | | | | | | | LONG_LONG_MAX is a symbol defined in <limits.h> which may not be available so better rely on something provided by a kernel header. While at it, turn these function-like macros into inline functions. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Convert debug printks to pr_debug getting.Ralf Baechle2014-05-232-16/+9
| | | | | | And another bunch of #ifdefs bite the dust. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Get rid of unuable extended precision support.Ralf Baechle2014-05-231-3/+0
| | | | | | No usable functionality and nothig does ever define IEEE854_XP anyway. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: IP22: This platform may come with either MIPS III or MIPS IV CPUs.Ralf Baechle2014-05-231-0/+4
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Remove most ifdefery.Ralf Baechle2014-05-213-82/+144
| | | | | | | | Most of these tests should be runtime tests. This also finally means that on a MIPS III systems MIPS IV opcodes are going to result in an exception as they're supposed to. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Turn macros into functions where possible.Ralf Baechle2014-05-2139-131/+143
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Harden ieee754int.h against multiple inclusion.Ralf Baechle2014-05-211-1/+4
| | | | | | | The header file had no include guards; this only happened to work because the file only contains macro definitions and protypes. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Reformat code according to coding style.Ralf Baechle2014-05-217-133/+140
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Move all debug fs code to a separate file.Ralf Baechle2014-05-213-56/+62
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Remove fine example of cargo cult programming.Ralf Baechle2014-05-211-7/+0
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Header file weeding.Ralf Baechle2014-05-217-29/+12
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: branch: Make inclusion of <asm/branch.h> safe.Ralf Baechle2014-05-211-0/+2
| | | | | | It was relying on other headers having been included before. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Use helpers to manipulate CAUSEF_BD flag.Ralf Baechle2014-05-212-8/+8
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: branch: New helpers to modify branch delay slot flag in struct pt_regsRalf Baechle2014-05-211-0/+10
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Get rid of typedefs.Ralf Baechle2014-05-2140-212/+212
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Use English spelling of `constant' rather than Danish.Ralf Baechle2014-05-212-8/+8
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Mark exception handling functions as __cold.Ralf Baechle2014-05-217-16/+23
| | | | | | | Optimizes the code flow and shaves of half a percent of the math-emu code size. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: math-emu: Use __BITFIELD_FIELD to eleminate redundant definitions.Ralf Baechle2014-05-211-63/+23
| | | | | | | Union _ieee754sp was even duplicated even though there are no endian dependencies in it all. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Move definition of __BITFIELD_FIELD to sharable header.Ralf Baechle2014-05-213-18/+32
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linusLinus Torvalds2014-05-2023-421/+310
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull MIPS fixes from Ralf Baechle: "MIPS fixes for various loose ends: - Fix workarounds for R4000 erratum. - Patch up DEC, Siemens-Nixdorf and Loongson hardware support. - Wire up renameat2 syscall. - Delete unused file - it was causing false warnings from maintenance scripts. - Revert a patch because it's functionality is now implemented twice which causes superfluous /proc/cpuinfo output. - Fix a microMIPS regression" * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: MIPS: mm: Fix broken microMIPS kernel regression. MIPS: Add new AUDIT_ARCH token for the N32 ABI on MIPS64 MIPS: Wire up renameat2 syscall. MIPS: inst.h: Rename BITFIELD_FIELD to __BITFIELD_FIELD. MIPS: Remove file missed when removing rm9k support a while ago. MIPS/loongson2_cpufreq: Fix CPU clock rate setting MIPS: Loongson: No need to select GENERIC_HARDIRQS_NO__DO_IRQ MIPS: csum_partial.S CPU_DADDI_WORKAROUNDS bug fix MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix MIPS: __delay CPU_DADDI_WORKAROUNDS bug fix MIPS: DEC/SNI: O32 wrapper stack switching fixes MIPS: DEC: Bus error handler <asm/cpu-type.h> fixes MAINTAINERS: TURBOchannel: Update entry Revert "MIPS: MT: proc: Add support for printing VPE and TC ids"
| * MIPS: mm: Fix broken microMIPS kernel regression.Steven J. Hill2014-05-142-4/+7
| | | | | | | | | | | | | | | | | | | | | | | | Commit f4ae17aa0f2122b52f642985b46210a1f2eceb0a [MIPS: mm: Use scratch for PGD when !CONFIG_MIPS_PGD_C0_CONTEXT] broke microMIPS kernel builds. This patch refactors that code similar to what was done for the 'clear_page' and 'copy_page' functions. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6744/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: Add new AUDIT_ARCH token for the N32 ABI on MIPS64Markos Chandras2014-05-141-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A MIPS64 kernel may support ELF files for all 3 MIPS ABIs (O32, N32, N64). Furthermore, the AUDIT_ARCH_MIPS{,EL}64 token does not provide enough information about the ABI for the 64-bit process. As a result of which, userland needs to use complex seccomp filters to decide whether a syscall belongs to the o32 or n32 or n64 ABI. Therefore, a new arch token for MIPS64/n32 is added so it can be used by seccomp to explicitely set syscall filters for this ABI. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Acked-by: Eric Paris <eparis@redhat.com> Acked-by: Paul Moore <pmoore@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: linux-mips@linux-mips.org Link: http://sourceforge.net/p/libseccomp/mailman/message/32239040/ Patchwork: https://patchwork.linux-mips.org/patch/6818/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: Wire up renameat2 syscall.Ralf Baechle2014-05-135-3/+10
| | | | | | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: inst.h: Rename BITFIELD_FIELD to __BITFIELD_FIELD.Ralf Baechle2014-05-131-199/+199
| | | | | | | | | | | | | | <uapi/asm/inst.h> is exported to userland so the macro name BITFIELD_FIELD pollutes the namespace. Prefix the name with __ fixes this. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: Remove file missed when removing rm9k support a while ago.Ralf Baechle2014-05-131-56/+0
| | | | | | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS/loongson2_cpufreq: Fix CPU clock rate settingAaro Koskinen2014-05-131-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Loongson2 has been using (incorrectly) kHz for cpu_clk rate. This has been unnoticed, as loongson2_cpufreq was the only place where the rate was set/get. After commit 652ed95d5fa6074b3c4ea245deb0691f1acb6656 (cpufreq: introduce cpufreq_generic_get() routine) things however broke, and now loops_per_jiffy adjustments are incorrect (1000 times too long). The patch fixes this by changing cpu_clk rate to Hz. Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi> Cc: stable@vger.kernel.org Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: cpufreq@vger.kernel.org Cc: Aaro Koskinen <aaro.koskinen@iki.fi> Patchwork: https://patchwork.linux-mips.org/patch/6678/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: Loongson: No need to select GENERIC_HARDIRQS_NO__DO_IRQPaul Bolle2014-05-131-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | Commit 0e476d91244e ("MIPS: Loongson: Add Loongson-3 Kconfig options") added "select GENERIC_HARDIRQS_NO__DO_IRQ". But the Kconfig symbol GENERIC_HARDIRQS_NO__DO_IRQ was already removed in v2.6.38, so that select is a nop. Drop it. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/6677/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: csum_partial.S CPU_DADDI_WORKAROUNDS bug fixMaciej W. Rozycki2014-05-131-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This change reverts most of commit 60724ca59eda766a30be57aec6b49bc3e2bead91 [MIPS: IP checksums: Remove unncessary .set pseudos] that introduced warnings with the CPU_DADDI_WORKAROUNDS option set: arch/mips/lib/csum_partial.S: Assembler messages: arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:467: Warning: used $3 with ".set at=$3" [...] arch/mips/lib/csum_partial.S:577: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:577: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:577: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:601: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:601: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:601: Warning: used $3 with ".set at=$3" arch/mips/lib/csum_partial.S:601: Warning: used $3 with ".set at=$3" [and so on, and so on...] The warnings are benign and good code is produced regardless because no macros that'd use the assembler's temporary register are involved, however the `.set noat' directives removed by the commit referred are crucial to guarantee this is still going to be the case after any changes in the future. Therefore they need to be brought back to place which this change does. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6686/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fixMaciej W. Rozycki2014-05-131-7/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This corrects assembler warnings and broken code generated in __strncpy_from_user_asm: arch/mips/lib/strncpy_user.S: Assembler messages: arch/mips/lib/strncpy_user.S:52: Warning: Macro instruction expanded into multiple instructions in a branch delay slot with the CPU_DADDI_WORKAROUNDS option set. The function schedules delay slots manually where there is really no need to as GAS is happy to do it all itself, so undo it all and remove `.set noreorder'. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6685/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: __delay CPU_DADDI_WORKAROUNDS bug fixMaciej W. Rozycki2014-05-131-4/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With CPU_DADDI_WORKAROUNDS enabled __delay assembles with a macro in a branch delay slot: {standard input}: Assembler messages: {standard input}:18: Warning: Macro instruction expanded into multiple instructions in a branch delay slot and broken code results: 0000000000000000 <__delay>: 0: 1480ffff bnez a0,0 <__delay> 4: 24010001 li at,1 8: 0081202f dsubu a0,a0,at c: 03e00008 jr ra 10: 00000000 nop 14: 00000000 nop Consequently the function loops indefinitely, showing up prominently as a hang in the delay loop calibration at bootstrap. This change corrects the problem by forcing the immediate 1 into a register while keeping code produced identical where CPU_DADDI_WORKAROUNDS is disabled. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6669/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: DEC/SNI: O32 wrapper stack switching fixesMaciej W. Rozycki2014-05-135-137/+61
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 231a35d37293ab88d325a9cb94e5474c156282c0 [[MIPS] RM: Collected changes] broke DECstation support by introducing an incompatible copy of arch/mips/dec/prom/call_o32.S in arch/mips/fw/lib/, built unconditionally. The copy happens to land earlier of the two among the modules used in the link and is therefore chosen for the DECstation rather than the intended original. As a result random kernel data is corrupted because a pointer to the "%s" formatted output template is used as a temporary stack pointer rather than being passed down to prom_printf. This also explains why prom_printf still works, up to a point -- the next argument is the actual string to output so it works just fine as the output template until enough kernel data has been corrupted to cause a crash. This change adjusts the modified wrapper in arch/mips/fw/lib/call_o32.S to let callers request no stack switching by passing a null temporary stack pointer in $a1, reworks the DECstation callers to work with the updated interface and removes the old copy from arch/mips/dec/prom/call_o32.S. A few minor readability adjustments are included as well, most importantly O32_SZREG is now used throughout where applicable rather than hardcoded multiplies of 4 and $fp is used to access the argument save area as a more usual register to operate the stack with rather than $s0. Finally an update is made to the temporary stack space used by the SNI platform to guarantee 8-byte alignment as per o32 requirements. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6668/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: DEC: Bus error handler <asm/cpu-type.h> fixesMaciej W. Rozycki2014-05-132-0/+2
| | | | | | | | | | | | | | | | | | | | | | Commit 69f24d1784b631b81a54eb57c49bf46536dd2382 [MIPS: Optimize current_cpu_type() for better code.] missed an update for two DECstation bus error support files that now do not build, this is a fix. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6667/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * Revert "MIPS: MT: proc: Add support for printing VPE and TC ids"Ralf Baechle2014-05-131-8/+1
| | | | | | | | | | | | | | Reverts commit 795038a6910937fa167d47f6f6183db0eb8fb706 because d6d3c9afaab47418ab2d7f874fb8aeac1f067104 provides the same functionality in a more generic way. Both patches applied however means that the VPE and TC IDs get printed twice currently.
* | Merge branch 'parisc-3.15-4' of ↵Linus Torvalds2014-05-204-46/+65
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc fixes from Helge Deller: "There are two patches in here: The first patch greatly improves latency and corrects the memory ordering in our light-weight atomic locking syscall. The second patch ratelimits printing of userspace segfaults in the same way as it's done on other platforms. This fixes a possible DOS on parisc since it prevents the syslog to grow too fast. For example, when the debian acl2 package was built on our debian buildd servers, this package produced lots of gigabytes in syslog in very short time and thus filled our harddisks, which then turned the server nearly completely unaccessible and unresponsive" * 'parisc-3.15-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Improve LWS-CAS performance parisc: ratelimit userspace segfault printing
| * | parisc: Improve LWS-CAS performanceJohn David Anglin2014-05-151-3/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The attached change significantly improves the performance of the LWS-CAS code in syscall.S. This allows a number of packages to build (e.g., zeromq3, gtest and libxs) that previously failed because slow LWS-CAS performance under contention. In particular, interrupts taken while the lock was taken degraded performance significantly. The change does the following: 1) Disables interrupts around the CAS operation, and 2) Changes the loads and stores to use the ordered completer, "o", on PA 2.0. "o" and "ma" with a zero offset are equivalent. The latter is accepted on both PA 1.X and 2.0. The use of ordered loads and stores probably makes no difference on all existing hardware, but it seemed pedantically correct. In particular, the CAS operation must complete before LDCW lock is released. As written before, a processor could reorder the operations. I don't believe the period interrupts are disabled is long enough to significantly increase interrupt latency. For example, the TLB insert code is longer. Worst case is a memory fault in the CAS operation. Signed-off-by: John David Anglin <dave.anglin@bell.net> Cc: stable@vger.kernel.org # 3.13+ Signed-off-by: Helge Deller <deller@gmx.de>
| * | parisc: ratelimit userspace segfault printingHelge Deller2014-05-153-43/+56
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Ratelimit printing of userspace segfaults and make it runtime configurable via the /proc/sys/debug/exception-trace variable. This should resolve syslog from growing way too fast and thus prevents possible system service attacks. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # 3.13+
* | | Merge tag 'arm64-fixes' of ↵Linus Torvalds2014-05-202-3/+11
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull two arm64 fixes from Catalin Marinas: - arm64 migrate_irqs() fix following commit ffde1de64012 (irqchip: Gic: Support forced affinity setting) - fix arm64 pud_huge() to return 0 when only 2 levels page tables are used (__PAGETABLE_PMD_FOLDED defined and pmd_huge already covers block entries at the first level), otherwise KVM gets confused * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: fix pud_huge() for 2-level pagetables arm64: use cpu_online_mask when using forced irq_set_affinity
| * | | arm64: fix pud_huge() for 2-level pagetablesMark Salter2014-05-161-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The following happens when trying to run a kvm guest on a kernel configured for 64k pages. This doesn't happen with 4k pages: BUG: failure at include/linux/mm.h:297/put_page_testzero()! Kernel panic - not syncing: BUG! CPU: 2 PID: 4228 Comm: qemu-system-aar Tainted: GF 3.13.0-0.rc7.31.sa2.k32v1.aarch64.debug #1 Call trace: [<fffffe0000096034>] dump_backtrace+0x0/0x16c [<fffffe00000961b4>] show_stack+0x14/0x1c [<fffffe000066e648>] dump_stack+0x84/0xb0 [<fffffe0000668678>] panic+0xf4/0x220 [<fffffe000018ec78>] free_reserved_area+0x0/0x110 [<fffffe000018edd8>] free_pages+0x50/0x88 [<fffffe00000a759c>] kvm_free_stage2_pgd+0x30/0x40 [<fffffe00000a5354>] kvm_arch_destroy_vm+0x18/0x44 [<fffffe00000a1854>] kvm_put_kvm+0xf0/0x184 [<fffffe00000a1938>] kvm_vm_release+0x10/0x1c [<fffffe00001edc1c>] __fput+0xb0/0x288 [<fffffe00001ede4c>] ____fput+0xc/0x14 [<fffffe00000d5a2c>] task_work_run+0xa8/0x11c [<fffffe0000095c14>] do_notify_resume+0x54/0x58 In arch/arm/kvm/mmu.c:unmap_range(), we end up doing an extra put_page() on the stage2 pgd which leads to the BUG in put_page_testzero(). This happens because a pud_huge() test in unmap_range() returns true when it should always be false with 2-level pages tables used by 64k pages. This patch removes support for huge puds if 2-level pagetables are being used. Signed-off-by: Mark Salter <msalter@redhat.com> [catalin.marinas@arm.com: removed #ifndef around PUD_SIZE check] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: <stable@vger.kernel.org> # v3.11+
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