Commit 2b838687 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Make /dev/zero reads interruptible by signals

This helps with bad latencies for large reads from /dev/zero, but might
conceivably break some application that "knows" that a read of /dev/zero
cannot return early.  So do this early in the merge window to give us
maximal test coverage, even if the patch is totally trivial.

Obviously, no well-behaved application should ever depend on the read
being uninterruptible, but hey, bugs happen.
Signed-off-by: default avatarLinus Torvalds <>
parent 07a2039b
......@@ -694,9 +694,8 @@ static ssize_t read_zero(struct file * file, char __user * buf,
written += chunk - unwritten;
if (unwritten)
/* Consider changing this to just 'signal_pending()' with lots of testing */
if (fatal_signal_pending(current))
return written ? written : -EINTR;
if (signal_pending(current))
return written ? written : -ERESTARTSYS;
buf += chunk;
count -= chunk;
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