- 17 Feb, 2015 40 commits
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Jan Kiszka authored
This helper probes the type of the gdb server. Supported are QEMU and KGDB so far. Knowledge about the gdb server is required e.g. to retrieve the current CPU or current task. Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Jan Kiszka authored
Add the internal helper get_thread_info that calculates the thread_info from a given task variable. Also export this service as a convenience function. Note: ia64 version is untested. Signed-off-by:
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Jan Kiszka authored
This helper caches to result of "show architecture" and matches the provided arch (sub-)string against that output. Signed-off-by:
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Jan Kiszka authored
Add the helper task_by_pid that can look up a task by its PID. Also export it as a convenience function. Signed-off-by:
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Jan Kiszka authored
This class allows to iterate over all tasks of the target. Signed-off-by:
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Jan Kiszka authored
This pokes into the log buffer of the debugged kernel, dumping it to the gdb console. Helping in case the target should or can no longer execute dmesg itself. Signed-off-by:
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Jan Kiszka authored
Add helpers for reading integers from target memory buffers. Required when caching the memory access is more efficient than reading individual values via gdb. Signed-off-by:
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Jan Kiszka authored
Parse the target endianness from the output of "show endian" and cache the result to return it via the new helper get_target_endiannes. We will need it for reading integers from buffers that contain target memory. Signed-off-by:
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Jan Kiszka authored
Add the internal helper get_module_by_name to obtain the module structure corresponding to the given name. Also export this service as a convenience function. Signed-off-by:
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Jan Kiszka authored
This installs a silent breakpoint on the do_init_module function. The breakpoint handler will try to load symbols from the module files found during lx-symbols execution. This way, breakpoints can be set to module initialization functions, and there is no need to explicitly call lx-symbols after (re-)loading a module. Signed-off-by:
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Jan Kiszka authored
This provides a reliable breakpoint target, required for automatic symbol loading via the gdb helper command 'lx-symbols'. Signed-off-by:
Rusty Russell <rusty@rustcorp.com.au> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by:
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Jan Kiszka authored
This is probably the most useful helper when debugging kernel modules: lx-symbols first reloads vmlinux. Then it searches recursively for *.ko files in the specified paths and the current directory. Finally it walks the kernel's module list, issuing the necessary add-symbol-file command for each loaded module so that gdb knows which module symbol corresponds to which address. It also looks up variable sections (bss, data, rodata) and appends their address to the add-symbole-file command line. This allows to access global module variables just like any other variable. Signed-off-by:
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Jan Kiszka authored
Will soon be used for loading symbols, printing global variables or listing modules. Signed-off-by:
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Jan Kiszka authored
Provide an internal helper with container_of semantics. As type lookups are very slow in gdb-python and we need a type "long" for this, cache the reference to this type object. Then export the helper also as a convenience function form use at the gdb command line. Signed-off-by:
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Jan Kiszka authored
Type lookups are very slow in gdb-python which is often noticeable when iterating over a number of objects. Introduce the helper class CachedType that keeps a reference to a gdb.Type object but also refreshes it after an object file has been loaded. Signed-off-by:
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Jan Kiszka authored
This provides the basic infrastructure to load kernel-specific python helper scripts when debugging the kernel in gdb. The loading mechanism is based on gdb loading for <objfile>-gdb.py when opening <objfile>. Therefore, this places a corresponding link to the main helper script into the output directory that contains vmlinux. The main scripts will pull in submodules containing Linux specific gdb commands and functions. To avoid polluting the source directory with compiled python modules, we link to them from the object directory. Due to gdb.parse_and_eval and string redirection for gdb.execute, we depend on gdb >= 7.2. This feature is enabled via CONFIG_GDB_SCRIPTS. Signed-off-by:
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Fabian Frederick authored
Fix checkpatch error: ERROR: switch and case should be at the same indent Signed-off-by:
Fabian Frederick <fabf@skynet.be> Signed-off-by:
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Fabian Frederick authored
affs_symlink_inode_operations was already declared extern in affs.h Signed-off-by:
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Fabian Frederick authored
return is not needed at the end of function. Signed-off-by:
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Fabian Frederick authored
else is unnecessary after return -ENAMETOOLONG Signed-off-by:
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Fabian Frederick authored
30 was used all over the place to compare name length against AFFS maximum name length. Signed-off-by:
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Fabian Frederick authored
- Some min() were used with different types. - Create a new variable in __affs_hash_dentry() to process affs_check_name()/min() return Signed-off-by:
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Fabian Frederick authored
Call mutex_destroy() on superblock mutex in affs_kill_sb() otherwise mutex debugging code isn't able to detect that mutex is used after being freed. (thanks to Jan Kara for complete definition). Signed-off-by:
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Fabian Frederick authored
Use the same fallback to normal IO in case of write operations beyond EOF as fat direct IO. This patch fixes fsx file -d -Z -r 4096 -w 4096 Report: 129(129 mod 256): TRUNCATE DOWN from 0x3ff01 to 0xb3f6 130(130 mod 256): WRITE 0x22000 thru 0x2dfff (0xc000 bytes) HOLE Thanks to Jan for helping me on this problem. The ideal solution suggested by Jan Kara would be to use cont_write_begin() but affs direct_IO shouldn't be used a lot anyway... Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Fabian Frederick authored
Signed-off-by:
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Geert Uytterhoeven authored
- "inode.i_ino" is "unsigned long", - "loff_t" is always "unsigned long long", - "sector_t" should be cast to "unsigned long long" for printing, - "u32" should not be cast to "unsigned int" for printing. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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Chris Mason authored
The spinlock in eventfd_poll is trying to protect the count of events so it can decide if it should return POLLIN, POLLERR, or POLLOUT. But, because of the way we drop the lock after calling poll_wait, and drop it again before returning, we have the same pile of races with the lock as we do with a single read of ctx->count(). This replaces the lock with a read barrier and single read. eventfd_write does a single bump of ctx->count, so this should not add new races with adding events. eventfd_read is similar, it will do a single decrement with the lock held, and so we're making the race with concurrent readers slightly larger. This spinlock is the top CPU user in kernel code during one of our workloads. Removing it gives us a ~2% boost. [arnd@arndb.de: avoid unused variable warning] [dan.carpenter@oracle.com: type bug in eventfd_poll()] Signed-off-by:
Chris Mason <clm@fb.com> Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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John de la Garza authored
Signed-off-by:
John de la Garza <john@jjdev.com> Signed-off-by:
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WANG Chao authored
When updating PT_NOTE header size (ie. p_memsz), an overflow issue happens with the following bogus note entry: n_namesz = 0xFFFFFFFF n_descsz = 0x0 n_type = 0x0 This kind of note entry should be dropped during updating p_memsz. But because n_namesz is 32bit, after (n_namesz + 3) & (~3), it's overflow to 0x0, the note entry size looks sane and reserved. When userspace (eg. crash utility) is trying to access such bogus note, it could lead to an unexpected behavior (eg. crash utility segment fault because it's reading bogus address). The source of bogus note hasn't been identified yet. At least we could drop the bogus note so user space wouldn't be surprised. Signed-off-by:
WANG Chao <chaowang@redhat.com> Cc: Dave Anderson <anderson@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Randy Wright <rwright@hp.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Fabian Frederick <fabf@skynet.be> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Rashika Kheria <rashika.kheria@gmail.com> Cc: Greg Pearson <greg.pearson@hp.com> Signed-off-by:
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Geoff Levand authored
Add a new kexec preprocessor macro IND_FLAGS, which is the bitwise OR of all the possible kexec IND_ kimage_entry indirection flags. Having this macro allows for simplified code in the prosessing of the kexec kimage_entry items. Also, remove the local powerpc definition and use the generic one. Signed-off-by:
Geoff Levand <geoff@infradead.org> Acked-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by:
Vivek Goyal <vgoyal@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Maximilian Attems <max@stro.at> Cc: Michal Marek <mmarek@suse.cz> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Paul Bolle <pebolle@tiscali.nl> Signed-off-by:
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Geoff Levand authored
Define new kexec preprocessor macros IND_*_BIT that define the bit position of the kimage entry flags. Change the existing IND_* flag macros to be defined as bit shifts of the corresponding IND_*_BIT macros. Also wrap all C language code in kexec.h with #if !defined(__ASSEMBLY__) so assembly files can include kexec.h to get the IND_* and IND_*_BIT macros. Some CPU instruction sets have tests for bit position which are convenient in implementing routines that operate on the kimage entry list. The addition of these bit position macros in a common location will avoid duplicate definitions and the chance that changes to the IND_* flags will not be propagated to assembly files. Signed-off-by:
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Geoff Levand authored
Simplify the code around one of the conditionals in the kexec_load syscall routine. The original code was confusing with a redundant check on KEXEC_ON_CRASH and comments outside of the conditional block. This change switches the order of the conditional check, and cleans up the comments for the conditional. There is no functional change to the code. Signed-off-by:
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Geoff Levand authored
Remove the unneded declaration for a kexec_load() routine. Fixes errors like these when running 'make headers_check': include/uapi/linux/kexec.h: userspace cannot reference function or variable defined in the kernel Paul said: : The kexec_load declaration isn't very useful for userspace, see the patch : I submitted in http://lkml.kernel.org/r/1389791824.17407.9.camel@x220 . : And After my attempt the export of that declaration has also been : discussed in : http://lkml.kernel.org/r/115373b6ac68ee7a305975896e1c4971e8e51d4c.1408731991.git.geoff@infradead.org : : In that last discussion no one has been able to point to an actual user of : it. So, as far as I can tell, no one actually uses it. Which makes : sense, because including this header by itself doesn't give one access to : a useful definition of kexec_load. So why bother with the declaration? Signed-off-by:
Paul Bolle <pebolle@tiscali.nl> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Maximilian Attems <max@stro.at> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by:
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Alexander Kuleshov authored
Signed-off-by:
Alexander Kuleshov <kuleshovmail@gmail.com> Acked-by:
"Eric W. Biederman" <ebiederm@xmission.com> Acked-by:
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Baoquan He authored
struct kimage has a member destination which is used to store the real destination address of each page when load segment from user space buffer to kernel. But we never retrieve the value stored in kimage->destination, so this member variable in kimage and its assignment operation are redundent code. I guess for_each_kimage_entry just does the work that kimage->destination is expected to do. So in this patch just make a cleanup to remove it. Signed-off-by:
Baoquan He <bhe@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by:
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Davidlohr Bueso authored
Call __set_current_state() instead of assigning the new state directly. These interfaces also aid CONFIG_DEBUG_ATOMIC_SLEEP environments, keeping track of who changed the state. Signed-off-by:
Davidlohr Bueso <dbueso@suse.de> Acked-by:
Oleg Nesterov <oleg@redhat.com> Signed-off-by:
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Fabian Frederick authored
Commit 84c751bd ("ptrace: add ability to retrieve signals without removing from a queue (v4)") includes <linux/compat.h> globally in ptrace.c This patch removes inclusion under if defined CONFIG_COMPAT. Signed-off-by:
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Fred Chou authored
Use the MSDOS_SB macro to get msdos_sb_info, instead of coding it directly. Signed-off-by:
Fred Chou <fred.chou.nd@gmail.com> Acked-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by:
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Fabian Frederick authored
Fix sparse warning: fs/reiserfs/inode.c:2769:19: warning: Using plain integer as NULL pointer Signed-off-by:
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Fabian Frederick authored
Let locking subsystem decide on mutex management. As reported by Andrew Morton this patch fixes a bug: : lock_ufs() is assuming that on non-preempt uniprocessor, the calling : code will run atomically up to the matching unlock_ufs(). : : But that isn't true. The very first site I looked at (ufs_frag_map) : does sb_bread() under lock_ufs(). And sb_bread() will call schedule(), : very commonly. : : The ->mutex_owner stuff is a bit hacky but should work OK. Signed-off-by:
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