Many embedded systems don't need the full POSIX timer support. Configuring them out provides a nice kernel image size reduction. When POSIX timers are configured out, the PTP clock subsystem should be left out as well. However a bunch of ethernet drivers currently *select* the later in their Kconfig entries. Therefore some more work was needed to break that hard dependency from those drivers without preventing their usage altogether. Therefore this series also includes kconfig changes to implement a new keyword to express some reverse dependencies like "select" does, named "imply", and still allowing for the target config symbol to be disabled if the user or a direct dependency says so. At this point I'd like to gather ACKs especially from people in the "To" field. Ideally this would need to go upstream as a single series to avoid cross subsystem dependency issues. So far it was suggested that this could go via the kbuild tree. Given the end goal and the included timer cleanup patches I'd lean towards the timer tree but any tree would suit me just as well. This is also available here for those who prefer a git tree: git://git.linaro.org/people/nicolas.pitre/linux/ configurable_posix_timers Changes from v3: - Added a patch to move sys_alarm to itimer.c where the support code lives. - Added a patch to move entropy collection out of posix-cpu-timers.c. - Remove itimer as well when POSIX_TIMERS=n as they rely on code already removed. This means the getitimer, setitimer and alarm syscalls are also stubbed out in that case. - Reverted the addition of empty timer stubs from posix-timers.h. Since there is only a few callers, it's better to conditionalize call sites instead, and get a link error if some were missed. Easier to clearly ponder the implications that way. - Collected more ACKs. Changes from v2: - Dropped the patch adding the "suggest" keyword as nothing uses it. Requested by Paul Bolle. - Various documentation and commit log clarifications, prompted also by Paul Bolle. - Collected more ACKs. Changes from v1: - added "suggest" to kconfig for completeness - various typo fixes - small "imply" effect visibility fix The bulk of the diffstat comes from the kconfig lex parser regeneration. Diffstat: Documentation/kbuild/kconfig-language.txt | 29 + arch/alpha/kernel/osf_sys.c | 8 + drivers/Makefile | 2 +- drivers/char/Kconfig | 1 + drivers/net/ethernet/adi/Kconfig | 2 +- drivers/net/ethernet/amd/Kconfig | 2 +- drivers/net/ethernet/amd/xgbe/xgbe-main.c | 6 +- drivers/net/ethernet/broadcom/Kconfig | 4 +- drivers/net/ethernet/cavium/Kconfig | 2 +- drivers/net/ethernet/freescale/Kconfig | 2 +- drivers/net/ethernet/intel/Kconfig | 10 +- drivers/net/ethernet/mellanox/mlx4/Kconfig | 2 +- drivers/net/ethernet/mellanox/mlx5/core/Kconfig | 2 +- drivers/net/ethernet/renesas/Kconfig | 2 +- drivers/net/ethernet/samsung/Kconfig | 2 +- drivers/net/ethernet/sfc/Kconfig | 2 +- drivers/net/ethernet/stmicro/stmmac/Kconfig | 2 +- drivers/net/ethernet/ti/Kconfig | 2 +- drivers/net/ethernet/tile/Kconfig | 2 +- drivers/ptp/Kconfig | 10 +- fs/exec.c | 2 + include/linux/ptp_clock_kernel.h | 65 +- include/linux/time.h | 2 - init/Kconfig | 17 + kernel/compat.c | 8 + kernel/exit.c | 15 +- kernel/fork.c | 2 + kernel/signal.c | 6 + kernel/sys.c | 3 +- kernel/time/Makefile | 10 +- kernel/time/alarmtimer.c | 6 +- kernel/time/itimer.c | 15 +- kernel/time/posix-cpu-timers.c | 4 - kernel/time/posix-stubs.c | 123 ++ kernel/time/timer.c | 16 +- scripts/kconfig/expr.h | 2 + scripts/kconfig/menu.c | 55 +- scripts/kconfig/symbol.c | 24 +- scripts/kconfig/zconf.gperf | 1 + scripts/kconfig/zconf.hash.c_shipped | 30 +- scripts/kconfig/zconf.tab.c_shipped | 1581 +++++++++++------------ scripts/kconfig/zconf.y | 16 +- security/selinux/hooks.c | 11 +- 43 files changed, 1148 insertions(+), 960 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
