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2013-06-24sh_eth: fix unhandled RFE interruptSergei Shtylyov
EESR.RFE (receive FIFO overflow) interrupt is enabled by the driver on all SoCs and sh_eth_error() handles it but it's not present in any initializer/assignment of the 'eesr_err_check' field of 'struct sh_eth_cpu_data'. This leads to that interrupt not being handled and cleared, and finally to disabling IRQ and the driver being non-functional. Modify DEFAULT_EESR_ERR_CHECK macro and all explicit initializers of the above mentioned field to contain the EESR.RFE bit. Remove useless backslashes from the initializers, while at it. Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24qmi_wwan: add various Novatel Gobi1K IDsDan Williams
Found in the Windows INF files while investigating the Novatel/Verizon USB-1000 device. The USB-1000 is verified as a Gobi1K device and works with QMI after loading appropriate firmware. Signed-off-by: Dan Williams <dcbw@redhat.com> Acked-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24net: eth: davicnci_cpdma: check dma map errorSebastian Siewior
Since the DMA mapping may fail the caller should check the return value. Cc: Mugunthan V N <mugunthanvnm@ti.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24bonding: fix slave speed reporting in bond_miimon_commitNikolay Aleksandrov
When we have BOND_LINK_UP the speed is reported unconditionally with %u format although it can be SPEED_UNKNOWN (-1). After this patch it returns 0 in that case in an attempt to keep the existing scripts happy. One line is intenionally left 81 chars because it gets ugly if broken. Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Acked-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24net/mlx_en: Timestamping is not supported in slave modeAmir Vadai
Old hypervisors don't mask out timestamp capability for slave. Till slave support will be added, need to disable capability by slave. Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24Update headers to update various SMB3 ioctl definitionsSteve French
MS-SMB2 Section 2.2.31 lists fsctls. Update our list of valid cifs/smb2/smb3 fsctls and some related structs based on more recent version of docs. Additional detail on less common ones can be found in MS-FSCC section 2.3. CopyChunk (server side copy, ie refcopy) will depend on a few of these Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24Update cifs version numberSteve French
More than 160 fixes since we last bumped the version number of cifs.ko. Update to version 2.01 so it is easier in modinfo to tell that fixes are in. Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24Add ability to dipslay SMB3 share flags and capabilities for debuggingSteve French
SMB3 protocol adds various optional per-share capabilities (and SMB3.02 adds one more beyond that). Add ability to dump (/proc/fs/cifs/DebugData) the share capabilities and share flags to improve debugging. Signed-off-by: Steve French <smfrench@gmail.com> Acked-by: Jeff Layton <jlayton@redhat.com>
2013-06-24Add some missing SMB3 and SMB3.02 flagsSteve French
A few missing flags from SMB3.0 dialect, one missing from 2.1, and the new #define flags for SMB3.02 Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24Add SMB3.02 dialect supportSteve French
The new Windows update supports SMB3.02 dialect, a minor update to SMB3. This patch adds support for mounting with vers=3.02 Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com>
2013-06-24Fix endian error in SMB2 protocol negotiationSteve French
Fix minor endian error in Jeff's auth rewrite Reviewed-by: Jeff Laytonn <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: clean up the SecurityFlags write handlerJeff Layton
The SecurityFlags handler uses an obsolete simple_strtoul() call, and doesn't really handle the bounds checking well. Fix it to use kstrtouint() instead. Clean up the error messages as well and fix a bogus check for an unsigned int to be less than 0. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: update the default global_secflags to include "raw" NTLMv2Jeff Layton
Before this patchset, the global_secflags could only offer up a single sectype. With the new set though we have the ability to allow different sectypes since we sort out the one to use after talking to the server. Change the global_secflags to allow NTLMSSP or NTLMv2 by default. If the server sets the extended security bit in the Negotiate response, then we'll use NTLMSSP. If it doesn't then we'll use raw NTLMv2. Mounting a LANMAN server will still require a sec= option by default. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24move sectype to the cifs_ses instead of TCP_Server_InfoJeff Layton
Now that we track what sort of NEGOTIATE response was received, stop mandating that every session on a socket use the same type of auth. Push that decision out into the session setup code, and make the sectype a per-session property. This should allow us to mix multiple sectypes on a socket as long as they are compatible with the NEGOTIATE response. With this too, we can now eliminate the ses->secFlg field since that info is redundant and harder to work with than a securityEnum. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: track the enablement of signing in the TCP_Server_InfoJeff Layton
Currently, we determine this according to flags in the sec_mode, flags in the global_secflags and via other methods. That makes the semantics very hard to follow and there are corner cases where we don't handle this correctly. Add a new bool to the TCP_Server_Info that acts as a simple flag to tell us whether signing is enabled on this connection or not, and fix up the places that need to determine this to use that flag. This is a bit weird for the SMB2 case, where signing is per-session. SMB2 needs work in this area already though. The existing SMB2 code has similar logic to what we're using here, so there should be no real change in behavior. These changes should make it easier to implement per-session signing in the future though. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24add new fields to smb_vol to track the requested security flavorJeff Layton
We have this to some degree already in secFlgs, but those get "or'ed" so there's no way to know what the last option requested was. Add new fields that will eventually supercede the secFlgs field in the cifs_ses. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: add new fields to cifs_ses to track requested security flavorJeff Layton
Currently we have the overrideSecFlg field, but it's quite cumbersome to work with. Add some new fields that will eventually supercede it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: track the flavor of the NEGOTIATE reponseJeff Layton
Track what sort of NEGOTIATE response we get from the server, as that will govern what sort of authentication types this socket will support. There are three possibilities: LANMAN: server sent legacy LANMAN-type response UNENCAP: server sent a newer-style response, but extended security bit wasn't set. This socket will only support unencapsulated auth types. EXTENDED: server sent a newer-style response with the extended security bit set. This is necessary to support krb5 and ntlmssp auth types. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: add new "Unspecified" securityEnum valueJeff Layton
Add a new securityEnum value to cover the case where a sec= option was not explicitly set. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: factor out check for extended security bit into separate functionJeff Layton
Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: move handling of signed connections into separate functionJeff Layton
Move the sanity checks for signed connections into a separate function. SMB2's was a cut-and-paste job from CIFS code, so we can make them use the same function. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2013-06-24cifs: break out lanman NEGOTIATE handling into separate functionJeff Layton
...this also gets rid of some #ifdef ugliness too. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: break out decoding of security blob into separate functionJeff Layton
...cleanup. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: remove the cifs_ses->flags fieldJeff Layton
This field is completely unused: CIFS_SES_W9X is completely unused. CIFS_SES_LANMAN and CIFS_SES_OS2 are set but never checked. CIFS_SES_NT4 is checked, but never set. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: throw a warning if negotiate or sess_setup ops are passed NULL server ↵Jeff Layton
or session pointers These look pretty cargo-culty to me, but let's be certain. Leave them in place for now. Pop a WARN if it ever does happen. Also, move to a more standard idiom for setting the "server" pointer. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: make decode_ascii_ssetup void returnJeff Layton
...rc is always set to 0. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: remove useless memset in LANMAN auth codeJeff Layton
It turns out that CIFS_SESS_KEY_SIZE == CIFS_ENCPWD_SIZE, so this memset doesn't do anything useful. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: remove protocolEnum definitionJeff Layton
The field that held this was removed quite some time ago. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cifs: add a "nosharesock" mount option to force new sockets to server to be ↵Jeff Layton
created Some servers set max_vcs to 1 and actually do enforce that limit. Add a new mount option to work around this behavior that forces a mount request to open a new socket to the server instead of reusing an existing one. I'd prefer to come up with a solution that doesn't require this, so consider this a debug patch that you can use to determine whether this is the real problem. Cc: Jim McDonough <jmcd@samba.org> Cc: Steve French <smfrench@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2013-06-24cpufreq: s3c2416: fix forgotten driver_data conversionsHeiko Stübner
Commit 5070158804b5 (cpufreq: rename index as driver_data in cpufreq_frequency_table) renamed the index field to driver_data. But it seems some uses in the s3c2416 driver were forgotten. So convert the last index users to read driver_data. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2013-06-23fs: fix new splice.c kernel-doc warningRandy Dunlap
Fix new kernel-doc warning in fs/splice.c: Warning(fs/splice.c:1298): No description found for parameter 'opos' Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-06-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input Pull input subsystem updates from Dmitry Torokhov: "A few small fixups for cyttsp, wacom and xpad drivers" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: xpad - fix for "Mad Catz Street Fighter IV FightPad" controllers Input: wacom - add a new stylus (0x100802) for Intuos5 and Cintiqs Input: add missing dependencies on CONFIG_HAS_IOMEM Input: cyttsp - fix swapped mfg_stat and mfg_cmd registers Input: cyttsp - add missing handshake Input: cyttsp - fix memcpy size param
2013-06-23ARM: mvebu: fix length of ethernet registers in mv78260 dtsiEzequiel Garcia
The length of the registers area for the Marvell 370/XP Ethernet controller was incorrect in the .dtsi: 0x2500, while it should have been 0x4000. This problem wasn't noticed because there used to be a static mapping for all the MMIO register region set up by ->map_io(). The register length was fixed in all the other device tree files, except from the armada-xp-mv78260.dtsi, in the following commit: commit cf8088c5cac6ce20d914b9131533844b9291a054 Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Date: Tue May 21 12:33:27 2013 +0200 arm: mvebu: fix length of Ethernet registers area in .dtsi This commit fixes a kernel panic in mvneta_probe(), when the kernel tries to access the unmapped registers: [ 163.639092] mvneta d0070000.ethernet eth0: mac: 6e:3c:4f:87:17:2e [ 163.646962] mvneta d0074000.ethernet eth1: mac: 6a:04:4e:6f:f5:ef [ 163.654853] mvneta d0030000.ethernet eth2: mac: 2a:99:19:19:fc:4c [ 163.661258] Unable to handle kernel paging request at virtual address f011bcf0 [ 163.668523] pgd = c0004000 [ 163.671237] [f011bcf0] *pgd=2f006811, *pte=00000000, *ppte=00000000 [ 163.677565] Internal error: Oops: 807 [#1] SMP ARM [ 163.682370] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc6-01850-gba0682e #11 [ 163.690046] task: ef04c000 ti: ef03e000 task.ti: ef03e000 [ 163.695467] PC is at mvneta_probe+0x34c/0xabc [...] Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
2013-06-23console/font: Refactor font support code selection logicGeert Uytterhoeven
The current Makefile rules to build font support are messy and buggy. Replace them by Kconfig rules: - Introduce CONFIG_FONT_SUPPORT, which controls the building of all font code, - Select CONFIG_FONT_SUPPORT for all drivers that use fonts, - Select CONFIG_FONT_8x16 for all drivers that default to the VGA8x16 font, - Drop the bogus console dependency for CONFIG_VIDEO_VIVI, - Always process drivers/video/console/Makefile, as some drivers need fonts even if CONFIG_VT is not set. This fixes (if CONFIG_SOLO6X10=y and there are no built-in console drivers): drivers/built-in.o: In function `solo_osd_print': drivers/staging/media/solo6x10/solo6x10-enc.c:144: undefined reference to `.find_font' This fixes (if CONFIG_VT=n): drivers/built-in.o: In function `vivi_init': vivi.c:(.init.text+0x1a3da): undefined reference to `find_font' Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> [original part] Acked-by: Randy Dunlap <rdunlap@infradead.org> [drivers/video/Makefile]
2013-06-23Revert "staging/solo6x10: depend on CONFIG_FONTS"Geert Uytterhoeven
This reverts commit 8c090cfbf980581454ae4caae731574fedd7dce8. CONFIG_FONTS is not about enabling font support, but about enabling manual selection of built-in fonts. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23input: cros_ec_keyb_clear_keyboard() depends on CONFIG_PM_SLEEPGeert Uytterhoeven
If CONFIG_PM_SLEEP is not set: drivers/input/keyboard/cros_ec_keyb.c:211: warning: ‘cros_ec_keyb_clear_keyboard’ defined but not used Move the definition of cros_ec_keyb_clear_keyboard() inside the section protected by #ifdef CONFIG_PM_SLEEP to fix this. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Simon Glass <sjg@chromium.org> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2013-06-23score: Wire up asm-generic/xor.hGeert Uytterhoeven
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23score: Remove unneeded <asm/dma-mapping.h>Geert Uytterhoeven
It just includes <asm-generic/dma-mapping-broken.h>, which is already handled by <linux/dma-mapping.h> for the !CONFIG_HAS_DMA case (score sets CONFIG_NO_DMA=y). Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com>
2013-06-23openrisc: Wire up asm-generic/xor.hGeert Uytterhoeven
crypto/xor.c:25:21: error: asm/xor.h: No such file or directory Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Jonas Bonn <jonas@southpole.se>
2013-06-23h8300/boot: Use POSIX "$((..))" instead of bashism "$[...]"Geert Uytterhoeven
On Ubuntu, where /bin/sh -> dash, "make ARCH=h8300 clean" gives: printf: 1: $[0x00400000+0x00140000]: expected numeric value Replace the bash-specific "$[...]" by POSIX "$((..))" for arithmetic expansion to fix this. Note that according to the bash 4.1 manpage, "$[...]" is deprecated, and will be removed in upcoming versions of bash. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23h8300: Mark H83002 and H83048 CPU support brokenGeert Uytterhoeven
arch/h8300/include/asm/io.h supports only H83007 (H8/3006,3007), H83068 (H8/3065,3066,3067,3068,3069), and H8S2678 (H8S/2670,2673,2674R,2675,2676) CPU types. Hence disable H83002 (H8/3001,3002,3003) and H83048 (H8/3044,3045,3046,3047,3048,3052) CPU support at the Kconfig level. This fixes build failures in allmodconfig/allyesconfig builds, as these always choose the first CPU type (H83002), which was unsupported: arch/h8300/include/asm/io.h:13:2: error: #error UNKNOWN CPU TYPE Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23h8300: Switch h8300 to drivers/KconfigGeert Uytterhoeven
Convert the last remaining architecture to drivers/Kconfig. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23h8300: Limit timer channel ranges in KconfigGeert Uytterhoeven
arch/h8300/kernel/timer/itu.c and arch/h8300/kernel/timer/tpu.c only support 0--4 for CONFIG_H8300_ITU_CH resp. H8300_TPU_CH, hence limit them to that range in Kconfig. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23h8300: Wire up asm-generic/xor.hGeert Uytterhoeven
crypto/xor.c:25:21: fatal error: asm/xor.h: No such file or directory Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23h8300: Fill the system call table using a CALL() macroGeert Uytterhoeven
The CALL() macro abstracts (a.o.) the underscore symbol prefix. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23h8300: Fix <asm/tlb.h>Geert Uytterhoeven
Ten years ago, a mismerge happened, concatenating two slightly different versions of the same file. As a consequence, <asm-generic/tlb.h> was never included, leading to a build failure only now: kernel/cpu/idle.c: In function 'cpu_idle_loop': kernel/cpu/idle.c:70:4: error: implicit declaration of function 'check_pgt_cache' [-Werror=implicit-function-declaration] Remove the duplicates, and the header comment with the no longer correct file name. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Yoshinori Sato <ysato@users.sourceforge.jp>
2013-06-23h8300: Hardcode symbol prefixes in asm sourcesGeert Uytterhoeven
Commit e1b5bb6d1236d4ad2084c53aa83dde7cdf6f8eea ("consolidate cond_syscall and SYSCALL_ALIAS declarations") broke the h8300 build because it removed the duplicate SYMBOL_NAME() macro from arch/h8300/include/asm/linkage.h, and all the h8300 asm files include <asm/linkage.h> instead of <linux/linkage.h>: arch/h8300/kernel/entry.S: Assembler messages: arch/h8300/kernel/entry.S:158: Error: junk at end of line, first unrecognized character is `(' ... arch/h8300/kernel/syscalls.S: Assembler messages: arch/h8300/kernel/syscalls.S:6: Error: junk at end of line, first unrecognized character is `(' ... arch/h8300/lib/abs.S: Assembler messages: arch/h8300/lib/abs.S:12: Error: junk at end of line, first unrecognized character is `(' ... arch/h8300/lib/memcpy.S: Assembler messages: arch/h8300/lib/memcpy.S:13: Error: junk at end of line, first unrecognized character is `(' ... arch/h8300/lib/memset.S: Assembler messages: arch/h8300/lib/memset.S:13: Error: junk at end of line, first unrecognized character is `(' ... Commit 126de6b20bfb82cc19012d5048f11f339ae5a021 ("linkage.h: fix build breakage due to symbol prefix handling") broke it even more, by removing SYMBOL_NAME() and replacing it by __SYMBOL_NAME(). Commit f8ce1faf55955de62e0a12e330c6d9a526071f65 ("Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linuxkernel/git/rusty/linux") also removed __SYMBOL_NAME(), hidden in a merge conflict resolution. Hence, replace the use of SYMBOL_NAME() and SYMBOL_NAME_LABEL() in h8300 assembler sources by hardcoding the underscore symbol prefix, like other architectures (blackfin/metag) do. This allows to kill SYMBOL_NAME_LABEL(). Now <asm/linkage.h> becomes empty, and h8300 can be switched to asm-generic/linkage.h. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2013-06-23x86/platform: Add kvmconfig to the phony targetsBorislav Petkov
... so as not to disable it with a file of the same name in the toplevel build directory. Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/1371801891-23618-1-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-06-23x86: Add NMI duration tracepointsDave Hansen
This patch has been invaluable in my adventures finding issues in the perf NMI handler. I'm as big a fan of printk() as anybody is, but using printk() in NMIs is deadly when they're happening frequently. Even hacking in trace_printk() ended up eating enough CPU to throw off some of the measurements I was making. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: paulus@samba.org Cc: acme@ghostprotocols.net Cc: Dave Hansen <dave@sr71.net> Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-06-23perf: Drop sample rate when sampling is too slowDave Hansen
This patch keeps track of how long perf's NMI handler is taking, and also calculates how many samples perf can take a second. If the sample length times the expected max number of samples exceeds a configurable threshold, it drops the sample rate. This way, we don't have a runaway sampling process eating up the CPU. This patch can tend to drop the sample rate down to level where perf doesn't work very well. *BUT* the alternative is that my system hangs because it spends all of its time handling NMIs. I'll take a busted performance tool over an entire system that's busted and undebuggable any day. BTW, my suspicion is that there's still an underlying bug here. Using the HPET instead of the TSC is definitely a contributing factor, but I suspect there are some other things going on. But, I can't go dig down on a bug like that with my machine hanging all the time. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: paulus@samba.org Cc: acme@ghostprotocols.net Cc: Dave Hansen <dave@sr71.net> [ Prettified it a bit. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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