Hi, There have been reports in the past of libata core code size being a problem in migration from deprecated IDE subsystem on legacy PATA only systems, i.e.: https://lore.kernel.org/linux-ide/db2838b7-4862-785b-3a1d-3bf09811340a@xxxxxxxxx/ This patchset re-organizes libata core code to exclude SATA specific code from being built for PATA only setups. The end result is up to 20% (by 20429 bytes, from 101787 bytes to 81358 bytes) smaller libata core code size (as measured for m68k arch using modified atari_defconfig) on affected setups. I've tested this patchset using pata_falcon driver under ARAnyM emulator. patches #1-10 are general fixes/cleanups done in the process of making the patchset (there should be no inter-dependencies between them except patch #9 which depends on patch #8) patch #11 separates PATA timings code to libata-pata-timings.c file patches #12-14 let compiler optimize out SATA specific code on non-SATA hosts by adding !IS_ENABLED(CONFIG_SATA_HOST) instances patches #15-21 separate SATA only code from libata-core.c file to libata-sata.c one patches #22-23 separate SATA only code from libata-scsi.c file to libata-sata.c one patches #24-25 separate SATA only code from libata-eh.c file to libata-sata.c one patch #26 makes "libata.force" kernel parameter optional Changes since v1 (https://lore.kernel.org/linux-ide/20200128133343.29905-1-b.zolnierkie@xxxxxxxxxxx/): - added Acked-by: tag from Tejun to "ata: remove stale maintainership information from core code" patch - added Reviewed-by: tag from Martin to "ata: make SATA_PMP option selectable only if any SATA host driver is enabled" patch - added Reviewed-by: tag from Christoph to following patches: - "ata: simplify ata_scsiop_inq_89()" - "ata: use COMMAND_LINE_SIZE for ata_force_param_buf[] size" - "ata: optimize struct ata_force_param size" - "ata: move EXPORT_SYMBOL_GPL()s close to exported code" - "ata: remove EXPORT_SYMBOL_GPL()s not used by modules" - converted "ata: add CONFIG_SATA_HOST=n version of ata_ncq_enabled()" patch to use IS_ENABLED() - added "ata: let compiler optimize out ata_dev_config_ncq() on non-SATA hosts" and "ata: let compiler optimize out ata_eh_set_lpm() on non-SATA hosts" patches - moved "ata: move sata_scr_*() to libata-core-sata.c" patch just after "ata: start separating SATA specific code from libata-core.c" one - dropped no longer needed patches (code savings <= 8 bytes): - "ata: move ata_do_link_spd_horkage() to libata-core-sata.c" - "ata: move ata_dev_config_ncq*() to libata-core-sata.c" - "ata: move sata_print_link_status() to libata-core-sata.c" - "ata: move sata_down_spd_limit() to libata-core-sata.c" - "ata: move sata_link_init_spd() to libata-core-sata.c" - "ata: move ata_eh_set_lpm() to libata-core-sata.c" - removed superfluos ifdefs - dropped file names in top of file headers - merged libata-scsi-sata.c and libata-eh-sata.c into libata-sata.c - emphasised in patch descriptions that atari_defconfig used for measurements has been modified (original one is still using deprecated IDE subsystem) - added "ata: make "libata.force" kernel parameter optional" patch Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics Bartlomiej Zolnierkiewicz (26): ata: remove stale maintainership information from core code ata: expose ncq_enable_prio sysfs attribute only on NCQ capable hosts ata: make SATA_PMP option selectable only if any SATA host driver is enabled sata_promise: use ata_cable_sata() ata: simplify ata_scsiop_inq_89() ata: use COMMAND_LINE_SIZE for ata_force_param_buf[] size ata: optimize struct ata_force_param size ata: move EXPORT_SYMBOL_GPL()s close to exported code ata: remove EXPORT_SYMBOL_GPL()s not used by modules ata: fix CodingStyle issues in PATA timings code ata: separate PATA timings code from libata-core.c ata: add CONFIG_SATA_HOST=n version of ata_ncq_enabled() ata: let compiler optimize out ata_dev_config_ncq() on non-SATA hosts ata: let compiler optimize out ata_eh_set_lpm() on non-SATA hosts ata: start separating SATA specific code from libata-core.c ata: move sata_scr_*() to libata-sata.c ata: move *sata_set_spd*() to libata-sata.c ata: move sata_link_{debounce,resume}() to libata-sata.c ata: move sata_link_hardreset() to libata-sata.c ata: move ata_qc_complete_multiple() to libata-sata.c ata: move sata_deb_timing_*() to libata-sata.c ata: start separating SATA specific code from libata-scsi.c ata: move ata_sas_*() to libata-sata.c ata: start separating SATA specific code from libata-eh.c ata: move ata_eh_analyze_ncq_error() & co. to libata-sata.c ata: make "libata.force" kernel parameter optional drivers/ata/Kconfig | 77 ++ drivers/ata/Makefile | 2 + drivers/ata/libata-core.c | 1124 ++-------------------- drivers/ata/libata-eh.c | 224 +---- drivers/ata/libata-pata-timings.c | 192 ++++ drivers/ata/libata-sata.c | 1483 +++++++++++++++++++++++++++++ drivers/ata/libata-scsi.c | 542 +---------- drivers/ata/libata-sff.c | 4 - drivers/ata/libata.h | 25 +- drivers/ata/sata_promise.c | 8 +- drivers/scsi/Kconfig | 1 + drivers/scsi/libsas/Kconfig | 1 + include/linux/libata.h | 163 ++-- 13 files changed, 2007 insertions(+), 1839 deletions(-) create mode 100644 drivers/ata/libata-pata-timings.c create mode 100644 drivers/ata/libata-sata.c -- 2.24.1
