lkml.org 
[lkml]   [2018]   [Oct]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] mISDN: Fix type of switch control variable in ctrl_teimanager
From
From: Nathan Chancellor <natechancellor@gmail.com>
Date: Fri, 19 Oct 2018 11:00:30 -0700

> Clang warns (trimmed for brevity):
>
> drivers/isdn/mISDN/tei.c:1193:7: warning: overflow converting case value
> to switch condition type (2147764552 to 18446744071562348872) [-Wswitch]
> case IMHOLD_L1:
> ^
> drivers/isdn/mISDN/tei.c:1187:7: warning: overflow converting case value
> to switch condition type (2147764550 to 18446744071562348870) [-Wswitch]
> case IMCLEAR_L2:
> ^
> 2 warnings generated.
>
> The root cause is that the _IOC macro can generate really large numbers,
> which don't find into type int. My research into how GCC and Clang are
> handling this at a low level didn't prove fruitful and surveying the
> kernel tree shows that aside from here and a few places in the scsi
> subsystem, everything that uses _IOC is at least of type 'unsigned int'.
> Make that change here because as nothing in this function cares about
> the signedness of the variable and it removes ambiguity, which is never
> good when dealing with compilers.
>
> While we're here, remove the unnecessary local variable ret (just return
> -EINVAL and 0 directly).
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/67
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Applied.

\
 
 \ /
  Last update: 2018-10-23 04:31    [W:0.036 / U:2.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site