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sparc64: Fix accidental syscall restart on child return from clone/fork/vfork. 

This fixes a regression added by
238468b2ac ("[SPARC64]: Use trap type
stored in pt_regs to handle syscall restart.")

Because we now encode the "returning from syscall" status in the
pt_regs area, we have to be mindful to zap it out in the child
of a fork.

During a parallel kernel build I saw an accidental -EINTR return
from vfork() in 'make' because of this bug.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-04-27 14:54:02 -07:00
parent 90888816ba
commit fd7354108a
1 changed files with 6 additions and 0 deletions
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6
arch/sparc64/kernel/process.c
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@ -591,6 +591,12 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
if (clone_flags & CLONE_SETTLS)
t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
/* We do not want to accidently trigger system call restart
* handling in the new thread. Therefore, clear out the trap
* type, which will make pt_regs_regs_is_syscall() return false.
*/
pt_regs_clear_trap_type(t->kregs);
return 0;
}