On 07/15/2014 10:38 PM, Chen Gang wrote: > On 07/15/2014 09:11 AM, Chen Gang wrote: >> >> >> On 07/15/2014 08:53 AM, Guenter Roeck wrote: >>> On 07/14/2014 05:34 PM, Chen Gang wrote: >>>> On 07/14/2014 05:22 PM, Chen Gang wrote: >>>>> >>>>> 在 2014年7月14日，下午4:57，Richard Weinberger <richard@xxxxxx> 写道： >>>>> >>>>>> Am 14.07.2014 10:48, schrieb Lars-Peter Clausen: >>>>>>> On 07/14/2014 10:31 AM, Richard Weinberger wrote: >>>>>>>> Am 13.07.2014 22:17, schrieb Greg Kroah-Hartman: >>>>>>>>> On Sun, Jul 13, 2014 at 09:33:38PM +0200, Richard Weinberger wrote: >>>>>>>>>> Maybe we could add COMPILE_TEST to the version string too? >>>>>>>>>> Just to detect such kernels fast in user bug reports... >>>>>>>>> >>>>>>>>> What kind of bug report are you going to get? >>>>>>>> >>>>>>>> User manages to enable CONFIG_FOO by selecting COMPILE_TEST and >>>>>>>> complains that it does not work. :) >>>>>>> >>>>>>> These drivers are typically drivers for some SoC peripheral and the >>>>>>> device will simply physically not exist on a platform that does not >>>>>>> provide HAS_IOMEM. This is not really any >>>>>>> different from making the driver selectable via COMPILE_TEST for >>>>>>> any other platform. To hit the issue you'd have to instantiate a >>>>>>> device driver instance for a device that >>>>>>> physically does not exist. This will always result in a failure. >>>>>> >>>>>> Okay, you have convinced me. :) >>>>>> >>>> >>>> After search the history patches, I found one related patch which made >>>> by myself (when I am in Asianux): >>>> >>>> "https://lkml.org/lkml/2013/7/1/641"; >>>> >>>> For me, it is a long discussion, and forced many members have to join >>>> in. Please help check again. >>>> >>> >>> One thing you could try would be to return NULL (or where appropriate >>> an error) in the #else case of CONFIG_HAS_IOMEM and CONFIG_HAS_IOPORT, >>> ie dont take COMPILE_TEST into account at all. Obviously that means >>> you won't be able to dump a warning message in the COMPILE_TEST >>> case, but at least the code would compile. The rejection of above patch >>> would make a good case for this approach. >>> For me, only let 'devm_io*map*' support COMPILE_TEST is OK, that can fix all related issues: [PATCH] lib: devres: Add dumy functions to support COMPILE_TEST when no IOMEM For some architectures which no IOMEM, 'devres' will be skipped. But many drivers may still want COMPILE_TEST, so let 'devres' support it. The related error (with allmodconfig under score): MODPOST 1365 modules ERROR: "devm_ioremap_resource" [drivers/watchdog/tegra_wdt.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/watchdog/of_xilinx_wdt.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/staging/iio/adc/mxs-lradc.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/pwm/pwm-clps711x.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/input/serio/olpc_apsp.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/input/serio/arc_ps2.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/rtc/rtc-xgene.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/rtc/rtc-stk17ta8.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/rtc/rtc-ds1742.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/rtc/rtc-ds1553.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/rtc/rtc-ds1511.ko] undefined! ERROR: "devm_ioremap_resource" [drivers/rtc/rtc-ds1286.ko] undefined! ERROR: "devm_ioremap" [drivers/rtc/rtc-rp5c01.ko] undefined! ERROR: "devm_ioremap" [drivers/rtc/rtc-msm6242.ko] undefined! ERROR: "devm_ioremap" [drivers/rtc/rtc-m48t59.ko] undefined! ERROR: "devm_ioremap" [drivers/rtc/rtc-m48t35.ko] undefined! ERROR: "devm_ioremap" [drivers/rtc/rtc-bq4802.ko] undefined! Signed-off-by: Chen Gang <gang.chen.5i5j@xxxxxxxxx> --- include/linux/device.h | 9 +++++++++ include/linux/io.h | 30 +++++++++++++++++++++++++++++- 2 files changed, 38 insertions(+), 1 deletion(-) diff --git a/include/linux/device.h b/include/linux/device.h index c2421e0..a7500c3 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -630,7 +630,16 @@ extern unsigned long devm_get_free_pages(struct device *dev, gfp_t gfp_mask, unsigned int order); extern void devm_free_pages(struct device *dev, unsigned long addr); +#ifdef CONFIG_HAS_IOMEM void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res); +#elif defined(CONFIG_COMPILE_TEST) +static inline void __iomem *devm_ioremap_resource(struct device *dev, + struct resource *res) +{ + pr_warn("no hardware io memory, only for COMPILE_TEST\n"); + return (__force void __iomem *)ERR_PTR(-ENXIO); +} +#endif /* CONFIG_HAS_IOMEM || CONFIG_COMPILE_TEST */ /* allows to add/remove a custom action to devres stack */ int devm_add_action(struct device *dev, void (*action)(void *), void *data); diff --git a/include/linux/io.h b/include/linux/io.h index b76e6e5..59128aa 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -58,14 +58,42 @@ static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) } #endif +#ifdef CONFIG_HAS_IOMEM + void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, unsigned long size); void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, unsigned long size); void devm_iounmap(struct device *dev, void __iomem *addr); +void devm_ioremap_release(struct device *dev, void *res); + +#elif defined(CONFIG_COMPILE_TEST) + +static inline void __iomem *devm_ioremap(struct device *dev, + resource_size_t offset, unsigned long size) +{ + pr_warn("no hardware io memory, only for COMPILE_TEST\n"); + return NULL; +} +static inline void __iomem *devm_ioremap_nocache(struct device *dev, + resource_size_t offset, unsigned long size) +{ + pr_warn("no hardware io memory, only for COMPILE_TEST\n"); + return NULL; +} + +static inline void devm_iounmap(struct device *dev, void __iomem *addr) +{ +} + +static inline void devm_ioremap_release(struct device *dev, void *res) +{ +} + +#endif /* CONFIG_HAS_IOMEM || CONFIG_COMPILE_TEST */ + int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length); -void devm_ioremap_release(struct device *dev, void *res); /* * Some systems do not have legacy ISA devices. -- 1.9.2.459.g68773ac >> >> OK, thanks: at least, it can be improved. But still welcome any other >> opinions of another related members. >> > > If no reply within 3 days (2014-07-18), I shall try to send related > patch for it within this week end (2014-07-20). > > Thanks. > -- Chen Gang Open, share, and attitude like air, water, and life which God blessed -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
