diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 35 | ||||
| -rw-r--r-- | init/calibrate.c | 11 | ||||
| -rw-r--r-- | init/do_mounts.c | 48 | ||||
| -rw-r--r-- | init/do_mounts_rd.c | 14 | ||||
| -rw-r--r-- | init/main.c | 24 |
5 files changed, 112 insertions, 20 deletions
diff --git a/init/Kconfig b/init/Kconfig index 412c21b00d51..43298f9810fb 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -391,7 +391,7 @@ config TREE_RCU config TREE_PREEMPT_RCU bool "Preemptible tree-based hierarchical RCU" - depends on PREEMPT + depends on PREEMPT && SMP help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or @@ -401,7 +401,7 @@ config TREE_PREEMPT_RCU config TINY_RCU bool "UP-only small-memory-footprint RCU" - depends on !SMP + depends on !PREEMPT && !SMP help This option selects the RCU implementation that is designed for UP systems from which real-time response @@ -410,7 +410,7 @@ config TINY_RCU config TINY_PREEMPT_RCU bool "Preemptible UP-only small-memory-footprint RCU" - depends on !SMP && PREEMPT + depends on PREEMPT && !SMP help This option selects the RCU implementation that is designed for real-time UP systems. This option greatly reduces the @@ -673,7 +673,7 @@ config CGROUP_MEM_RES_CTLR_SWAP be careful about enabling this. When memory resource controller is disabled by boot option, this will be automatically disabled and there will be no overhead from this. Even when you set this config=y, - if boot option "noswapaccount" is set, swap will not be accounted. + if boot option "swapaccount=0" is set, swap will not be accounted. Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page size is 4096bytes, 512k per 1Gbytes of swap. config CGROUP_MEM_RES_CTLR_SWAP_ENABLED @@ -688,7 +688,7 @@ config CGROUP_MEM_RES_CTLR_SWAP_ENABLED parameter should have this option unselected. For those who want to have the feature enabled by default should select this option (if, for some reason, they need to disable it - then noswapaccount does the trick). + then swapaccount=0 does the trick). config CGROUP_PERF bool "Enable perf_event per-cpu per-container group (cgroup) monitoring" @@ -715,6 +715,18 @@ config FAIR_GROUP_SCHED depends on CGROUP_SCHED default CGROUP_SCHED +config CFS_BANDWIDTH + bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED" + depends on EXPERIMENTAL + depends on FAIR_GROUP_SCHED + default n + help + This option allows users to define CPU bandwidth rates (limits) for + tasks running within the fair group scheduler. Groups with no limit + set are considered to be unconstrained and will run with no + restriction. + See tip/Documentation/scheduler/sched-bwc.txt for more information. + config RT_GROUP_SCHED bool "Group scheduling for SCHED_RR/FIFO" depends on EXPERIMENTAL @@ -917,6 +929,8 @@ config ANON_INODES menuconfig EXPERT bool "Configure standard kernel features (expert users)" + # Unhide debug options, to make the on-by-default options visible + select DEBUG_KERNEL help This option allows certain base kernel options and settings to be disabled or tweaked. This is for specialized @@ -933,7 +947,7 @@ config UID16 config SYSCTL_SYSCALL bool "Sysctl syscall support" if EXPERT depends on PROC_SYSCTL - default y + default n select SYSCTL ---help--- sys_sysctl uses binary paths that have been found challenging @@ -945,7 +959,7 @@ config SYSCTL_SYSCALL trying to save some space it is probably safe to disable this, making your kernel marginally smaller. - If unsure say Y here. + If unsure say N here. config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EXPERT @@ -1007,14 +1021,19 @@ config ELF_CORE help Enable support for generating core dumps. Disabling saves about 4k. + config PCSPKR_PLATFORM bool "Enable PC-Speaker support" if EXPERT - depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES + depends on HAVE_PCSPKR_PLATFORM + select I8253_LOCK default y help This option allows to disable the internal PC-Speaker support, saving some memory. +config HAVE_PCSPKR_PLATFORM + bool + config BASE_FULL default y bool "Enable full-sized data structures for core" if EXPERT diff --git a/init/calibrate.c b/init/calibrate.c index aae2f40fea4c..24df7976816c 100644 --- a/init/calibrate.c +++ b/init/calibrate.c @@ -9,6 +9,7 @@ #include <linux/init.h> #include <linux/timex.h> #include <linux/smp.h> +#include <linux/percpu.h> unsigned long lpj_fine; unsigned long preset_lpj; @@ -243,12 +244,19 @@ recalibrate: return lpj; } +static DEFINE_PER_CPU(unsigned long, cpu_loops_per_jiffy) = { 0 }; + void __cpuinit calibrate_delay(void) { unsigned long lpj; static bool printed; + int this_cpu = smp_processor_id(); - if (preset_lpj) { + if (per_cpu(cpu_loops_per_jiffy, this_cpu)) { + lpj = per_cpu(cpu_loops_per_jiffy, this_cpu); + pr_info("Calibrating delay loop (skipped) " + "already calibrated this CPU"); + } else if (preset_lpj) { lpj = preset_lpj; if (!printed) pr_info("Calibrating delay loop (skipped) " @@ -266,6 +274,7 @@ void __cpuinit calibrate_delay(void) pr_info("Calibrating delay loop... "); lpj = calibrate_delay_converge(); } + per_cpu(cpu_loops_per_jiffy, this_cpu) = lpj; if (!printed) pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n", lpj/(500000/HZ), diff --git a/init/do_mounts.c b/init/do_mounts.c index c0851a8e030c..0f6e1d985a3b 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -28,7 +28,7 @@ int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ int root_mountflags = MS_RDONLY | MS_SILENT; static char * __initdata root_device_name; static char __initdata saved_root_name[64]; -static int __initdata root_wait; +static int root_wait; dev_t ROOT_DEV; @@ -85,12 +85,15 @@ no_match: /** * devt_from_partuuid - looks up the dev_t of a partition by its UUID - * @uuid: 36 byte char array containing a hex ascii UUID + * @uuid: min 36 byte char array containing a hex ascii UUID * * The function will return the first partition which contains a matching * UUID value in its partition_meta_info struct. This does not search * by filesystem UUIDs. * + * If @uuid is followed by a "/PARTNROFF=%d", then the number will be + * extracted and used as an offset from the partition identified by the UUID. + * * Returns the matching dev_t on success or 0 on failure. */ static dev_t devt_from_partuuid(char *uuid_str) @@ -98,6 +101,28 @@ static dev_t devt_from_partuuid(char *uuid_str) dev_t res = 0; struct device *dev = NULL; u8 uuid[16]; + struct gendisk *disk; + struct hd_struct *part; + int offset = 0; + + if (strlen(uuid_str) < 36) + goto done; + + /* Check for optional partition number offset attributes. */ + if (uuid_str[36]) { + char c = 0; + /* Explicitly fail on poor PARTUUID syntax. */ + if (sscanf(&uuid_str[36], + "/PARTNROFF=%d%c", &offset, &c) != 1) { + printk(KERN_ERR "VFS: PARTUUID= is invalid.\n" + "Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%%d]\n"); + if (root_wait) + printk(KERN_ERR + "Disabling rootwait; root= is invalid.\n"); + root_wait = 0; + goto done; + } + } /* Pack the requested UUID in the expected format. */ part_pack_uuid(uuid_str, uuid); @@ -107,8 +132,21 @@ static dev_t devt_from_partuuid(char *uuid_str) goto done; res = dev->devt; - put_device(dev); + /* Attempt to find the partition by offset. */ + if (!offset) + goto no_offset; + + res = 0; + disk = part_to_disk(dev_to_part(dev)); + part = disk_get_part(disk, dev_to_part(dev)->partno + offset); + if (part) { + res = part_devt(part); + put_device(part_to_dev(part)); + } + +no_offset: + put_device(dev); done: return res; } @@ -126,6 +164,8 @@ done: * used when disk name of partitioned disk ends on a digit. * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the * unique id of a partition if the partition table provides it. + * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to + * a partition with a known unique id. * * If name doesn't have fall into the categories above, we return (0,0). * block_class is used to check if something is a disk name. If the disk @@ -143,8 +183,6 @@ dev_t name_to_dev_t(char *name) #ifdef CONFIG_BLOCK if (strncmp(name, "PARTUUID=", 9) == 0) { name += 9; - if (strlen(name) != 36) - goto fail; res = devt_from_partuuid(name); if (!res) goto fail; diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c index fe9acb0ae480..887629e24c54 100644 --- a/init/do_mounts_rd.c +++ b/init/do_mounts_rd.c @@ -120,6 +120,20 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor) } /* + * Read 512 bytes further to check if cramfs is padded + */ + sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0); + sys_read(fd, buf, size); + + if (cramfsb->magic == CRAMFS_MAGIC) { + printk(KERN_NOTICE + "RAMDISK: cramfs filesystem found at block %d\n", + start_block); + nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; + goto done; + } + + /* * Read block 1 to test for minix and ext2 superblock */ sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); diff --git a/init/main.c b/init/main.c index d7211faed2ad..63f5f6f8dc3b 100644 --- a/init/main.c +++ b/init/main.c @@ -163,7 +163,7 @@ static int __init obsolete_checksetup(char *line) p = __setup_start; do { int n = strlen(p->str); - if (!strncmp(line, p->str, n)) { + if (parameqn(line, p->str, n)) { if (p->early) { /* Already done in parse_early_param? * (Needs exact match on param part). @@ -209,8 +209,19 @@ early_param("quiet", quiet_kernel); static int __init loglevel(char *str) { - get_option(&str, &console_loglevel); - return 0; + int newlevel; + + /* + * Only update loglevel value when a correct setting was passed, + * to prevent blind crashes (when loglevel being set to 0) that + * are quite hard to debug + */ + if (get_option(&str, &newlevel)) { + console_loglevel = newlevel; + return 0; + } + + return -EINVAL; } early_param("loglevel", loglevel); @@ -369,9 +380,9 @@ static noinline void __init_refok rest_init(void) init_idle_bootup_task(current); preempt_enable_no_resched(); schedule(); - preempt_disable(); /* Call into cpu_idle with preempt disabled */ + preempt_disable(); cpu_idle(); } @@ -381,7 +392,7 @@ static int __init do_early_param(char *param, char *val) const struct obs_kernel_param *p; for (p = __setup_start; p < __setup_end; p++) { - if ((p->early && strcmp(param, p->str) == 0) || + if ((p->early && parameq(param, p->str)) || (strcmp(param, "console") == 0 && strcmp(p->str, "earlycon") == 0) ) { @@ -715,10 +726,11 @@ static void __init do_basic_setup(void) { cpuset_init_smp(); usermodehelper_init(); - init_tmpfs(); + shmem_init(); driver_init(); init_irq_proc(); do_ctors(); + usermodehelper_enable(); do_initcalls(); } |