forked from luck/tmp_suning_uos_patched
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: Linus Torvalds <torvalds@linux-foundation.org>
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@ -694,9 +694,8 @@ static ssize_t read_zero(struct file * file, char __user * buf,
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written += chunk - unwritten;
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if (unwritten)
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break;
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/* Consider changing this to just 'signal_pending()' with lots of testing */
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if (fatal_signal_pending(current))
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return written ? written : -EINTR;
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if (signal_pending(current))
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return written ? written : -ERESTARTSYS;
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buf += chunk;
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count -= chunk;
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cond_resched();
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