4.4-stable review patch. If anyone has any objections, please let me know.
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From: Arnd Bergmann arnd@arndb.de
commit 1f62ff34a90471d1b735bac2c79e894afc7c59bc upstream.
dev_dbg_ratelimited() is a macro that ignores its first argument when DEBUG is not set, which can lead to unused variable warnings:
ethernet/mellanox/mlxsw/pci.c: In function 'mlxsw_pci_cqe_sdq_handle': ethernet/mellanox/mlxsw/pci.c:646:18: warning: unused variable 'pdev' [-Wunused-variable] ethernet/mellanox/mlxsw/pci.c: In function 'mlxsw_pci_cqe_rdq_handle': ethernet/mellanox/mlxsw/pci.c:671:18: warning: unused variable 'pdev' [-Wunused-variable]
The macro already ensures that all its other arguments are silently ignored by the compiler without triggering a warning, through the use of the no_printk() macro, but the dev argument is not passed into that.
This changes the definition to use the same trick as no_printk() with an if(0) that leads the compiler to not evaluate the side-effects but still see that 'dev' might not be unused.
Signed-off-by: Arnd Bergmann arnd@arndb.de Suggested-by: Andrew Lunn andrew@lunn.ch Fixes: 6f586e663e3b ("driver-core: Shut up dev_dbg_reatelimited() without DEBUG") Reviewed-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/device.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/include/linux/device.h +++ b/include/linux/device.h @@ -1272,8 +1272,11 @@ do { \ dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ } while (0) #else -#define dev_dbg_ratelimited(dev, fmt, ...) \ - no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) +#define dev_dbg_ratelimited(dev, fmt, ...) \ +do { \ + if (0) \ + dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ +} while (0) #endif
#ifdef VERBOSE_DEBUG