fs: add kern_select() helper; remove in-kernel call to sys_select()
Using this helper allows us to avoid the in-kernel call to the sys_umount() syscall. This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
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12
fs/select.c
12
fs/select.c
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@ -675,8 +675,8 @@ out_nofds:
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return ret;
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}
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SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp,
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fd_set __user *, exp, struct timeval __user *, tvp)
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static int kern_select(int n, fd_set __user *inp, fd_set __user *outp,
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fd_set __user *exp, struct timeval __user *tvp)
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{
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struct timespec64 end_time, *to = NULL;
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struct timeval tv;
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@ -699,6 +699,12 @@ SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp,
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return ret;
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}
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SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp,
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fd_set __user *, exp, struct timeval __user *, tvp)
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{
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return kern_select(n, inp, outp, exp, tvp);
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}
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static long do_pselect(int n, fd_set __user *inp, fd_set __user *outp,
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fd_set __user *exp, struct timespec __user *tsp,
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const sigset_t __user *sigmask, size_t sigsetsize)
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@ -784,7 +790,7 @@ SYSCALL_DEFINE1(old_select, struct sel_arg_struct __user *, arg)
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
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return kern_select(a.n, a.inp, a.outp, a.exp, a.tvp);
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}
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#endif
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