diff options
Diffstat (limited to 'arch/parisc/kernel/process.c')
| -rw-r--r-- | arch/parisc/kernel/process.c | 28 |
1 files changed, 8 insertions, 20 deletions
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index 44e8534c52e9..38db36f64307 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -52,6 +52,7 @@ #include <asm/io.h> #include <asm/asm-offsets.h> +#include <asm/assembly.h> #include <asm/pdc.h> #include <asm/pdc_chassis.h> #include <asm/pgalloc.h> @@ -253,14 +254,16 @@ copy_thread(unsigned long clone_flags, unsigned long usp, #ifdef CONFIG_HPUX extern void * const hpux_child_return; #endif - - if (unlikely((p->flags & PF_KTHREAD) && usp != 0)) { + if (unlikely(p->flags & PF_KTHREAD)) { memset(cregs, 0, sizeof(struct pt_regs)); + if (!usp) /* idle thread */ + return 0; + /* kernel thread */ - cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN; /* Must exit via ret_from_kernel_thread in order * to call schedule_tail() */ + cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; cregs->kpc = (unsigned long) &ret_from_kernel_thread; /* * Copy function and argument to be called from @@ -275,22 +278,8 @@ copy_thread(unsigned long clone_flags, unsigned long usp, cregs->gr[25] = arg; } else { /* user thread */ - /* - * Note that the fork wrappers are responsible - * for setting gr[21]. - */ - - *cregs = *pregs; - - /* Set the return value for the child. Note that this is not - actually restored by the syscall exit path, but we put it - here for consistency in case of signals. */ - cregs->gr[28] = 0; /* child */ - - /* Use same stack depth as parent */ - cregs->ksp = (unsigned long)stack - + (pregs->gr[21] & (THREAD_SIZE - 1)); cregs->gr[30] = usp; + cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; if (personality(p->personality) == PER_HPUX) { #ifdef CONFIG_HPUX cregs->kpc = (unsigned long) &hpux_child_return; @@ -302,8 +291,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp, } /* Setup thread TLS area from the 4th parameter in clone */ if (clone_flags & CLONE_SETTLS) - cregs->cr27 = pregs->gr[23]; - + cregs->cr27 = pregs->gr[23]; } return 0; |