diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 22 | ||||
| -rw-r--r-- | init/do_mounts.c | 48 | ||||
| -rw-r--r-- | init/do_mounts_rd.c | 14 | ||||
| -rw-r--r-- | init/main.c | 26 |
4 files changed, 93 insertions, 17 deletions
diff --git a/init/Kconfig b/init/Kconfig index d62778390e5..43298f9810f 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 @@ -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 @@ -935,7 +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 @@ -947,7 +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 diff --git a/init/do_mounts.c b/init/do_mounts.c index c0851a8e030..0f6e1d985a3 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 fe9acb0ae48..887629e24c5 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 9c51ee7adf3..217ed23e948 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); @@ -370,9 +381,6 @@ static noinline void __init_refok rest_init(void) preempt_enable_no_resched(); schedule(); - /* At this point, we can enable user mode helper functionality */ - usermodehelper_enable(); - /* Call into cpu_idle with preempt disabled */ preempt_disable(); cpu_idle(); @@ -384,7 +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) ) { @@ -504,6 +512,9 @@ asmlinkage void __init start_kernel(void) parse_args("Booting kernel", static_command_line, __start___param, __stop___param - __start___param, &unknown_bootoption); + + jump_label_init(); + /* * These use large bootmem allocations and must precede * kmem_cache_init() @@ -722,6 +733,7 @@ static void __init do_basic_setup(void) driver_init(); init_irq_proc(); do_ctors(); + usermodehelper_enable(); do_initcalls(); } |