From 607a16858397829806c5a4db999ce6daf327f98c Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Fri, 20 May 2005 14:27:58 -0700 Subject: [PATCH] [PATCH] x86_64: Fix 32bit system call restart The test case at http://cvs.sourceforge.net/viewcvs.py/posixtest/posixtestsuite/conforman ce/interfaces/clock_nanosleep/1-5.c fails if it runs as a 32bit process on x86_86 machines. The root cause is the sub 32bit process fails to restart the syscall after it is interrupted by a signal. The syscall number of sys_restart_syscall in table sys_call_table is __NR_restart_syscall (219) while it's __NR_ia32_restart_syscall (0) in ia32_sys_call_table. When regs->rax==(unsigned long)-ERESTART_RESTARTBLOCK, function do_signal doesn't distinguish if the process is 64bit or 32bit, and always sets restart syscall number as __NR_restart_syscall (219). Signed-off-by: Zhang Yanmin Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/signal.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c index d439ced150c6..3fdcdba0fec5 100644 --- a/arch/x86_64/kernel/signal.c +++ b/arch/x86_64/kernel/signal.c @@ -452,7 +452,9 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset) regs->rip -= 2; } if (regs->rax == (unsigned long)-ERESTART_RESTARTBLOCK) { - regs->rax = __NR_restart_syscall; + regs->rax = test_thread_flag(TIF_IA32) ? + __NR_ia32_restart_syscall : + __NR_restart_syscall; regs->rip -= 2; } } -- 2.20.1