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/dev/zero: avoid repeated access_ok() checks
In read_zero, we check for access_ok() once for the count bytes. It is unnecessarily checked again in clear_user. Use __clear_user, which does not check for access_ok(). Signed-off-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -690,7 +690,7 @@ static ssize_t read_zero(struct file * file, char __user * buf,
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if (chunk > PAGE_SIZE)
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chunk = PAGE_SIZE; /* Just for latency reasons */
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unwritten = clear_user(buf, chunk);
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unwritten = __clear_user(buf, chunk);
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written += chunk - unwritten;
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if (unwritten)
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break;
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