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| author |   Thomas Meyer <thomas@m3y3r.de> | 2015-03-28 09:59:46 +0100 |
|---|---|---|
| committer |   Richard Weinberger <richard@nod.at> | 2015-04-13 21:17:44 +0200 |
| commit | 33bbc3065414722065a20cbdbeaf352173e72f39 (patch) | |
| tree | f4cf1b3df0f7a23f80a9d14129ec8f8c1f14ad19 | |
| parent | um: add a kmsg_dumper (diff) | |
| download | linux-dev-33bbc3065414722065a20cbdbeaf352173e72f39.tar.xz linux-dev-33bbc3065414722065a20cbdbeaf352173e72f39.zip | |
um: Move uml_postsetup in the init_thread stack
atomic_notifier_chain_register() and uml_postsetup() do call kernel code
that rely on the "current" kernel macro and a valid task_struct resp.
thread_info struct. Give those functions a valid stack by moving
uml_postsetup() in the init_thread stack. This moves enables a panic()
call in this early code to generate a valid stacktrace, instead of
crashing.
E.g. when an UML kernel is started with an initrd but too few physical
memory the panic() call get's actually processed.
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
| -rw-r--r-- | arch/um/include/shared/as-layout.h | 1 | ||||
| -rw-r--r-- | arch/um/kernel/um_arch.c | 15 | ||||
| -rw-r--r-- | arch/um/os-Linux/skas/process.c | 2 |
3 files changed, 12 insertions, 6 deletions
diff --git a/arch/um/include/shared/as-layout.h b/arch/um/include/shared/as-layout.h index 41c8c774ec10..ca1843e1df15 100644 --- a/arch/um/include/shared/as-layout.h +++ b/arch/um/include/shared/as-layout.h @@ -56,6 +56,7 @@ extern unsigned long brk_start; extern unsigned long host_task_size; extern int linux_main(int argc, char **argv); +extern void uml_finishsetup(void); struct siginfo; extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *); diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 926ecdceba86..07f798f4bcee 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -226,6 +226,16 @@ static struct notifier_block panic_exit_notifier = { .priority = 0 }; +void uml_finishsetup(void) +{ + atomic_notifier_chain_register(&panic_notifier_list, + &panic_exit_notifier); + + uml_postsetup(); + + new_thread_handler(); +} + /* Set during early boot */ unsigned long task_size; EXPORT_SYMBOL(task_size); @@ -326,11 +336,6 @@ int __init linux_main(int argc, char **argv) printf("Kernel virtual memory size shrunk to %lu bytes\n", virtmem_size); - atomic_notifier_chain_register(&panic_notifier_list, - &panic_exit_notifier); - - uml_postsetup(); - stack_protections((unsigned long) &init_thread_info); os_flush_stdout(); diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 50ebeae5cbb3..7a9777570a62 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -586,7 +586,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf) n = setjmp(initial_jmpbuf); switch (n) { case INIT_JMP_NEW_THREAD: - (*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler; + (*switch_buf)[0].JB_IP = (unsigned long) uml_finishsetup; (*switch_buf)[0].JB_SP = (unsigned long) stack + UM_THREAD_SIZE - sizeof(void *); break; |