lkml.org 
[lkml]   [2019]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] regulator: da903x: don't build with clang
On Thu, Mar 7, 2019 at 2:26 AM Arnd Bergmann <arnd@arndb.de> wrote:
>
> The da903x driver produces an annoying false-positive warning
> when built with clang:
>
> drivers/regulator/da903x.c:395:2: error: division by zero is undefined [-Werror,-Wdivision-by-zero]
> DA9030_LDO(13, 2100, 2100, 0, INVAL, 0, 0, RCTL11, 3), /* fixed @2.1V */
> ^ ~
> drivers/regulator/da903x.c:359:2: note: expanded from macro 'DA9030_LDO'
> DA903x_LDO(DA9030, _id, min, max, step, vreg, shift, nbits, ereg, ebit)
> ^ ~~~~
> drivers/regulator/da903x.c:320:39: note: expanded from macro 'DA903x_LDO'
> .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
> ^ ~~~~
> drivers/regulator/da903x.c:415:2: error: division by zero is undefined [-Werror,-Wdivision-by-zero]
> DA9034_LDO(5, 3100, 3100, 0, INVAL, 0, 0, OVER3, 7), /* fixed @3.1V */
> ^ ~
> drivers/regulator/da903x.c:356:2: note: expanded from macro 'DA9034_LDO'
> DA903x_LDO(DA9034, _id, min, max, step, vreg, shift, nbits, ereg, ebit)
> ^ ~~~~
> drivers/regulator/da903x.c:320:39: note: expanded from macro 'DA903x_LDO'
> .n_voltages = (step) ? ((max - min) / step + 1) : 1, \
> ^ ~~~~
>
> I already reported this as a bug in clang, but it may take a
> while to fix it. As I have not been able to come up with any
> reasonable workaround, I would just disable compilation here.
>
> Link: https://bugs.llvm.org/show_bug.cgi?id=38789
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> drivers/regulator/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index b7f249ee5e68..6d2651cd9887 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -223,6 +223,7 @@ config REGULATOR_CPCAP
> config REGULATOR_DA903X
> tristate "Dialog Semiconductor DA9030/DA9034 regulators"
> depends on PMIC_DA903X
> + depends on !CC_IS_CLANG # https://bugs.llvm.org/show_bug.cgi?id=38789
> help
> Say y here to support the BUCKs and LDOs regulators found on
> Dialog Semiconductor DA9030/DA9034 PMIC.
> --
> 2.20.0
>

Most pragmatic solution for now. Thanks for the patch.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

--
Thanks,
~Nick Desaulniers

\
 
 \ /
  Last update: 2019-03-07 20:10    [W:0.058 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site