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The disabled_wait() function uses its argument as the PSW address when
it stops the CPU with a wait PSW that is disabled for interrupts.
The different callers sometimes use a specific number like 0xdeadbeef
to indicate a specific failure, the early boot code uses 0 and some
other calls sites use __builtin_return_address(0).
At the time a dump is created the current PSW and the registers of a
CPU are written to lowcore to make them avaiable to the dump analysis
tool. For a CPU stopped with disabled_wait the PSW and the registers
do not really make sense together, the PSW address does not point to
the function the registers belong to.
Simplify disabled_wait() by using _THIS_IP_ for the PSW address and
drop the argument to the function.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Make the call chain more reliable by tagging the ftrace stack entries
with the stack pointer that is associated with the return address.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Rework the dump_trace() stack unwinder interface to support different
unwinding algorithms. The new interface looks like this:
struct unwind_state state;
unwind_for_each_frame(&state, task, regs, start_stack)
do_something(state.sp, state.ip, state.reliable);
The unwind_bc.c file contains the implementation for the classic
back-chain unwinder.
One positive side effect of the new code is it now handles ftraced
functions gracefully. It prints the real name of the return function
instead of 'return_to_handler'.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Change the __EMIT_BUG inline assembly to emit mergeable __bug_table
entries with type @progbits and specify the size of each entry.
The entry size is encoded sh_entsize field of the section definition,
it allows to identify which struct bug_entry to use to decode the
entries. This will be needed for the objtool support.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
The text_dma.S code uses its own macro to generate an inline version of an
expoline. To make it easier to identify all expolines in the kernel use a
thunk and a branch to the thunk just like the rest of the kernel code does
it.
The name of the text_dma.S expoline thunk is __dma__s390_indirect_jump_r14
and the section is named .dma.text.__s390_indirect_jump_r14.
This will be needed for the objtool support.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
The assembler version of the expoline thunk use the naming
__s390x_indirect_jump_rxuse_ry while the compiler generates names
like __s390_indirect_jump_rx_use_ry. Make the naming more consistent.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
The assembler code in arch/s390 misses proper ENDPROC statements
to properly end functions in a few places. Add them.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
To choose whether to pick the GID from the old (16bit) or new (32bit)
field, we should check if the old gid field is set to 0xffff. Mainline
checks the old *UID* field instead - cut'n'paste from the corresponding
code in ufs_get_inode_uid().
Fixes: 252e211e90ce
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
moving synchronous parts of ->destroy_inode() to ->evict_inode() is
not possible here - they are balancing the stuff done in ->alloc_inode(),
not the things acquired while using it or sanity checks.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fuse_destroy_inode() is gone - sanity checks that need the stack
trace of the caller get moved into ->evict_inode(), the rest joins
the RCU-delayed part which becomes ->free_inode().
While we are at it, don't just pass the address of what happens
to be the first member of structure to kmem_cache_free() -
get_fuse_inode() is there for purpose and it gives the proper
container_of() use. No behaviour change, but verifying correctness
is easier that way.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
the rest of this ->destroy_inode() instance could probably be folded
into ext4_evict_inode()
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
debugging printks left in ->destroy_inode() and so's the
update of inode count; we could take the latter to RCU-delayed
part (would take only moving the check on module exit past
rcu_barrier() there), but debugging output ought to either
stay where it is or go into ->evict_inode()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
we might want to drop ->destroy_inode() there - it's used only for
WARN_ON() now, and AFAICS that could be moved to ->evict_inode()
if we had one...
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
move the synchronous stuff from ->destroy_inode() to ->evict_inode(),
turn the RCU-delayed part into ->free_inode()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
