On Wed, Aug 07, 2019 at 11:29:16PM -0400, Qian Cai wrote:
> The commit 155433cb365e ("arm64: cache: Remove support for ASID-tagged
> VIVT I-caches") introduced some compiation warnings from GCC (and
> Clang) with -Winitializer-overrides),
>
> arch/arm64/kernel/cpuinfo.c:38:26: warning: initialized field
> overwritten [-Woverride-init]
> [ICACHE_POLICY_VIPT] = "VIPT",
> ^~~~~~
> arch/arm64/kernel/cpuinfo.c:38:26: note: (near initialization for
> 'icache_policy_str[2]')
> arch/arm64/kernel/cpuinfo.c:39:26: warning: initialized field
> overwritten [-Woverride-init]
> [ICACHE_POLICY_PIPT] = "PIPT",
> ^~~~~~
> arch/arm64/kernel/cpuinfo.c:39:26: note: (near initialization for
> 'icache_policy_str[3]')
> arch/arm64/kernel/cpuinfo.c:40:27: warning: initialized field
> overwritten [-Woverride-init]
> [ICACHE_POLICY_VPIPT] = "VPIPT",
> ^~~~~~~
> arch/arm64/kernel/cpuinfo.c:40:27: note: (near initialization for
> 'icache_policy_str[0]')
>
> because it initializes icache_policy_str[0 ... 3] twice. Since
> arm64 developers are keen to keep the style of initializing a static
> array with a non-zero pattern first, just disable those warnings for
> both GCC and Clang of this file.
>
> Fixes: 155433cb365e ("arm64: cache: Remove support for ASID-tagged VIVT
> I-caches")
> Signed-off-by: Qian Cai <c...@lca.pw>
It's a shame we can't just use one cc-disable-warning statement but
-Woverride-init wasn't added for GCC compatibility until clang 8.0.0
and we don't have an established minimum clang version.
With that said, I applied your patch and I don't see with warning with
W=1 anymore and I see both options get added to the clang command line
with V=1.
Reviewed-by: Nathan Chancellor <natechancel...@gmail.com>
Tested-by: Nathan Chancellor <natechancel...@gmail.com>
Cheers!
