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[S390] ptrace: fix return value of do_syscall_trace_enter()
authorGerald Schaefer <gerald.schaefer@de.ibm.com>
Wed, 12 May 2010 07:32:12 +0000 (09:32 +0200)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Wed, 12 May 2010 07:32:26 +0000 (09:32 +0200)
strace may change the system call number, so regs->gprs[2] must not
be read before tracehook_report_syscall_entry(). This fixes a bug
where "strace -f" will hang after a vfork().

Cc: <stable@kernel.org>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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