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[ Upstream commit005747526d] Fault injection uses debugfs in a way that the provided values via sysfs are interpreted as u64. Providing negative numbers results in an error: /sys/kernel/debug/fail_function# echo -1 > times sh: write error: Invalid argument Update the docs and examples to use "printf %#x <val>" in these cases. For "retval", reword the paragraph a little and fix a typo. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20210603125841.27436-1-wsa+renesas@sang-engineering.com Signed-off-by: Jonathan Corbet <corbet@lwn.net> Stable-dep-of:d472cf797c("debugfs: fix error when writing negative value to atomic_t debugfs file") Signed-off-by: Sasha Levin <sashal@kernel.org>