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Date: Mon, 09 Oct 2017 13:44:25 +0100 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>, "Tim Bingham" <tbingham@...mai.com> Subject: [PATCH 3.16 152/192] net: Implement net_dbg_ratelimited() for CONFIG_DYNAMIC_DEBUG case 3.16.49-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Tim Bingham <tbingham@...mai.com> commit 2c94b53738549d81dc7464a32117d1f5112c64d3 upstream. Prior to commit d92cff89a0c8 ("net_dbg_ratelimited: turn into no-op when !DEBUG") the implementation of net_dbg_ratelimited() was buggy for both the DEBUG and CONFIG_DYNAMIC_DEBUG cases. The bug was that net_ratelimit() was being called and, despite returning true, nothing was being printed to the console. This resulted in messages like the following - "net_ratelimit: %d callbacks suppressed" with no other output nearby. After commit d92cff89a0c8 ("net_dbg_ratelimited: turn into no-op when !DEBUG") the bug is fixed for the DEBUG case. However, there's no output at all for CONFIG_DYNAMIC_DEBUG case. This patch restores debug output (if enabled) for the CONFIG_DYNAMIC_DEBUG case. Add a definition of net_dbg_ratelimited() for the CONFIG_DYNAMIC_DEBUG case. The implementation takes care to check that dynamic debugging is enabled before calling net_ratelimit(). Fixes: d92cff89a0c8 ("net_dbg_ratelimited: turn into no-op when !DEBUG") Signed-off-by: Tim Bingham <tbingham@...mai.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- include/linux/net.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- a/include/linux/net.h +++ b/include/linux/net.h @@ -242,7 +242,15 @@ do { \ net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__) #define net_info_ratelimited(fmt, ...) \ net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) -#if defined(DEBUG) +#if defined(CONFIG_DYNAMIC_DEBUG) +#define net_dbg_ratelimited(fmt, ...) \ +do { \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ + if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \ + net_ratelimit()) \ + __dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__); \ +} while (0) +#elif defined(DEBUG) #define net_dbg_ratelimited(fmt, ...) \ net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__) #else
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