kernel.git/arch/s390/kernel/debug.c, branch linux-4.11.y

s390: kernel: Audit and remove any unnecessary uses of module.h

2017-02-17T06:40:31Z

Historically a lot of these existed because we did not have a distinction between what was modular code and what was providing support to modules via EXPORT_SYMBOL and friends. That changed when we forked out support for the latter into the export.h file. This means we should be able to reduce the usage of module.h in code that is obj-y Makefile or bool Kconfig. The advantage in doing so is that module.h itself sources about 15 other headers; adding significantly to what we feed cpp, and it can obscure what headers we are effectively using. Since module.h was the source for init.h (for __init) and for export.h (for EXPORT_SYMBOL) we consider each change instance for the presence of either and replace as needed. Build testing revealed some implicit header usage that was fixed up accordingly. Signed-off-by: Paul Gortmaker Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/debug: make debug event time stamps relative to the boot TOD clock

2017-02-07T06:27:13Z

The debug features currently uses absolute TOD time stamps for the debug events. Given that the TOD clock can jump forward and backward due to STP sync checks the order of debug events can get obfuscated. Replace the absolute TOD time stamps with a delta to the IPL time stamp. On a STP sync check the TOD clock correction is added to the IPL time stamp as well to make the deltas unaffected by STP sync check. The readout of the debug feature entries will convert the deltas back to absolute time stamps based on the Unix epoch. Signed-off-by: Martin Schwidefsky

Replace with globally

2016-12-24T19:46:01Z

This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*' sed -i -e "s!$PATT!#include !" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro Signed-off-by: Linus Torvalds

s390: Use pr_warn instead of pr_warning

2016-03-07T12:12:04Z

Convert the uses of pr_warning to pr_warn so there are fewer uses of the old pr_warning. Miscellanea: o Align arguments o Coalesce formats Signed-off-by: Joe Perches Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: remove all usages of PSW_ADDR_INSN

2016-01-19T11:14:03Z

Yet another leftover from the 31 bit era. The usual operation "y = x & PSW_ADDR_INSN" with the PSW_ADDR_INSN mask is a nop for CONFIG_64BIT. Therefore remove all usages and hope the code is a bit less confusing. Signed-off-by: Heiko Carstens Reviewed-by: David Hildenbrand

s390: time: Provide read_boot_clock64() and read_persistent_clock64()

2015-05-22T17:36:29Z

As part of addressing the "y2038 problem" for in-kernel uses, this patch converts read_boot_clock() to read_boot_clock64() and read_persistent_clock() to read_persistent_clock64() using timespec64. Rename some instances of 'timespec' to 'timespec64' in time.c and related references Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: linux390@de.ibm.com Signed-off-by: Xunlei Pang [jstultz: Fixed minor style and grammer tweaks pointed out by Ingo] Signed-off-by: John Stultz

s390/debug: avoid function call for debug_sprintf_*

2014-12-08T08:42:29Z

debug_sprintf_event/exception are called even for debug events with a disabling debug level. All other functions already do the check in a wrapper function. Lets do the same here. Due to the var_args the compiler rejects to make this function inline. So let's wrap this via a macro. This patch saves around 80 ns on my z196 for a KVM round trip (we have two debug statements for entry and exit) when KVM is build as a module. The savings for built-in drivers is smaller as we then avoid the PLT overhead for a function call. Signed-off-by: Christian Borntraeger Reviewed-by: Michael Holzheu Reviewed-by: David Hildenbrand Signed-off-by: Martin Schwidefsky

s390: convert use of typedef ctl_table to struct ctl_table

2013-10-28T07:36:25Z

This typedef is unnecessary and should just be removed. Signed-off-by: Joe Perches Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/time: correct use of store clock fast

2013-10-22T07:16:40Z

The result of the store-clock-fast (STCKF) instruction is a bit fuzzy. It can happen that the value stored on one CPU is smaller than the value stored on another CPU, although the order of the stores is the other way around. This can cause deltas of get_tod_clock() values to become negative when they should not be. We need to be more careful with store-clock-fast, this patch partially reverts git commit e4b7b4238e666682555461fa52eecd74652f36bb "time: always use stckf instead of stck if available". The get_tod_clock() function now uses the store-clock-extended (STCKE) instruction. get_tod_clock_fast() can be used if the fuzziness of store-clock-fast is acceptable e.g. for wait loops local to a CPU. Signed-off-by: Martin Schwidefsky

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-27T04:16:07Z

Pull vfs pile (part one) from Al Viro: "Assorted stuff - cleaning namei.c up a bit, fixing ->d_name/->d_parent locking violations, etc. The most visible changes here are death of FS_REVAL_DOT (replaced with "has ->d_weak_revalidate()") and a new helper getting from struct file to inode. Some bits of preparation to xattr method interface changes. Misc patches by various people sent this cycle *and* ocfs2 fixes from several cycles ago that should've been upstream right then. PS: the next vfs pile will be xattr stuff." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (46 commits) saner proc_get_inode() calling conventions proc: avoid extra pde_put() in proc_fill_super() fs: change return values from -EACCES to -EPERM fs/exec.c: make bprm_mm_init() static ocfs2/dlm: use GFP_ATOMIC inside a spin_lock ocfs2: fix possible use-after-free with AIO ocfs2: Fix oops in ocfs2_fast_symlink_readpage() code path get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero target: writev() on single-element vector is pointless export kernel_write(), convert open-coded instances fs: encode_fh: return FILEID_INVALID if invalid fid_type kill f_vfsmnt vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op nfsd: handle vfs_getattr errors in acl protocol switch vfs_getattr() to struct path default SET_PERSONALITY() in linux/elf.h ceph: prepopulate inodes only when request is aborted d_hash_and_lookup(): export, switch open-coded instances 9p: switch v9fs_set_create_acl() to inode+fid, do it before d_instantiate() 9p: split dropping the acls from v9fs_set_create_acl() ...