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| author | Frederick Lawler <fred@fredlawl.com> | 2019-05-07 18:24:52 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-05-09 16:45:20 -0500 |
| commit | 017124725c155a3e1b09429d27c5846b0efafa89 (patch) | |
| tree | 3110a2e1c4d4b71dc26e88e8810e36acc22ccdf7 /drivers/pci | |
| parent | 7e696b8ae9a7f939584284a12eec3b7c62123836 (diff) | |
| download | lwn-017124725c155a3e1b09429d27c5846b0efafa89.tar.gz lwn-017124725c155a3e1b09429d27c5846b0efafa89.zip | |
PCI: pciehp: Replace pciehp_debug module param with dyndbg
Previously pciehp debug messages were enabled by the pciehp_debug module
parameter, e.g., by booting with this kernel command line option:
pciehp.pciehp_debug=1
Convert this mechanism to use the generic dynamic debug (dyndbg) feature.
After this commit, pciehp debug messages are enabled by building the kernel
with CONFIG_DYNAMIC_DEBUG=y and booting with this command line option:
dyndbg="file pciehp* +p"
The dyndbg facility is much more flexible: messages can be enabled at boot-
or run-time based on the file name, function name, line number, message
test, etc. See Documentation/admin-guide/dynamic-debug-howto.rst for more
details.
Link: https://lore.kernel.org/lkml/20190509141456.223614-7-helgaas@kernel.org
Signed-off-by: Frederick Lawler <fred@fredlawl.com>
[bhelgaas: commit log, comment, remove pciehp_debug parameter]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/hotplug/pciehp.h | 16 | ||||
| -rw-r--r-- | drivers/pci/hotplug/pciehp_core.c | 3 |
2 files changed, 6 insertions, 13 deletions
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h index 506e1d923a1f..af5d9f92e6d5 100644 --- a/drivers/pci/hotplug/pciehp.h +++ b/drivers/pci/hotplug/pciehp.h @@ -29,13 +29,13 @@ extern bool pciehp_poll_mode; extern int pciehp_poll_time; -extern bool pciehp_debug; +/* + * Set CONFIG_DYNAMIC_DEBUG=y and boot with 'dyndbg="file pciehp* +p"' to + * enable debug messages. + */ #define dbg(format, arg...) \ -do { \ - if (pciehp_debug) \ - printk(KERN_DEBUG "%s: " format, MY_NAME, ## arg); \ -} while (0) + pr_debug("%s: " format, MY_NAME, ## arg); #define err(format, arg...) \ printk(KERN_ERR "%s: " format, MY_NAME, ## arg) #define info(format, arg...) \ @@ -44,11 +44,7 @@ do { \ printk(KERN_WARNING "%s: " format, MY_NAME, ## arg) #define ctrl_dbg(ctrl, format, arg...) \ - do { \ - if (pciehp_debug) \ - dev_printk(KERN_DEBUG, &ctrl->pcie->device, \ - format, ## arg); \ - } while (0) + dev_dbg(&ctrl->pcie->device, format, ## arg) #define ctrl_err(ctrl, format, arg...) \ dev_err(&ctrl->pcie->device, format, ## arg) #define ctrl_info(ctrl, format, arg...) \ diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index fc5366b50e95..6ff204c435bf 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -27,7 +27,6 @@ #include "../pci.h" /* Global variables */ -bool pciehp_debug; bool pciehp_poll_mode; int pciehp_poll_time; @@ -35,10 +34,8 @@ int pciehp_poll_time; * not really modular, but the easiest way to keep compat with existing * bootargs behaviour is to continue using module_param here. */ -module_param(pciehp_debug, bool, 0644); module_param(pciehp_poll_mode, bool, 0644); module_param(pciehp_poll_time, int, 0644); -MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); |