Martin Peschke f32c9e03d4 scsi: zfcp: early returns for traces disabled via level ... This patch adds early checks to avoid burning CPU cycles on the assembly of trace entries which would be skipped anyway. Introduce a static const variable to keep the trace level to check with debug_level_enabled() in sync with the actual trace emit with debug_event(). In order not to refactor the SAN tracing too much, simply use a define instead. This change is only for the non / semi hot paths, while the actual (I/O) hot path was already improved earlier: zfcp_dbf_scsi() is already guarded by its only caller _zfcp_dbf_scsi() since commit dcd20e2316 ("[SCSI] zfcp: Only collect SCSI debug data for matching trace levels"). zfcp_dbf_hba_fsf_res() is already guarded by its only caller zfcp_dbf_hba_fsf_response() since commit 2e261af84c ("[SCSI] zfcp: Only collect FSF/HBA debug data for matching trace levels"). Signed-off-by: Martin Peschke <mpeschke@linux.vnet.ibm.com> [maier@linux.vnet.ibm.com: rebase, reword, default level 3 branch prediction] Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>		2017-08-10 19:37:03 -04:00
..
block	libnvdimm for 4.13	2017-07-07 09:44:06 -07:00
char	mm, tree wide: replace __GFP_REPEAT by __GFP_RETRY_MAYFAIL with more useful semantic	2017-07-12 16:26:03 -07:00
cio	s390: chp: handle CRW_ERC_INIT for channel-path status change	2017-07-13 11:28:29 +02:00
crypto	s390/zcrypt: Fix missing newlines at some debug feature messages.	2017-07-05 07:35:29 +02:00
net	drivers: s390: move static and inline before return type	2017-07-12 16:26:04 -07:00
scsi	scsi: zfcp: early returns for traces disabled via level	2017-08-10 19:37:03 -04:00
virtio	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2017-05-16 09:24:44 -07:00
Makefile