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Re: Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1

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To: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Subject: Re: Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1
From: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 17 Jan 2023 21:37:35 +0100
Cc: linux-kernel@xxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, linux-wireless@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, Michael Karcher <kernel@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>
In-reply-to: <CAMuHMdWpHSsAB3WosyCVgS6+t4pU35Xfj3tjmdCDoyS2QkS7iw@mail.gmail.com>
References: <CAHk-=wgf929uGOVpiWALPyC7pv_9KbwB2EAvQ3C4woshZZ5zqQ@mail.gmail.com> <20221227082932.798359-1-geert@linux-m68k.org> <alpine.DEB.2.22.394.2212270933530.311423@ramsan.of.borg> <c05bee5d-0d69-289b-fe4b-98f4cd31a4f5@physik.fu-berlin.de> <CAMuHMdXNJveXHeS=g-aHbnxtyACxq1wCeaTg8LbpYqJTCqk86g@mail.gmail.com> <3800eaa8-a4da-b2f0-da31-6627176cb92e@physik.fu-berlin.de> <CAMuHMdWbBRkhecrqcir92TgZnffMe8ku2t7PcVLqA6e6F-j=iw@mail.gmail.com> <429140e0-72fe-c91c-53bc-124d33ab5ffa@physik.fu-berlin.de> <CAMuHMdWpHSsAB3WosyCVgS6+t4pU35Xfj3tjmdCDoyS2QkS7iw@mail.gmail.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.6.1

Hi!

On 1/17/23 21:05, Geert Uytterhoeven wrote:

Isn't this supposed to be caught by this check:

         a, __same_type(a, NULL)

?


Yeah, but gcc thinks it is smarter than us...
Probably it drops the test, assuming UB cannot happen.


Hmm, sounds like a GGC bug to me then. Not sure how to fix this then.

Adrian

--
 .''`.  John Paul Adrian Glaubitz
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References:
- Re: Build regressions/improvements in v6.2-rc1
  - From: Geert Uytterhoeven
- Re: Build regressions/improvements in v6.2-rc1
  - From: John Paul Adrian Glaubitz
- Re: Build regressions/improvements in v6.2-rc1
  - From: Geert Uytterhoeven
- Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1
  - From: John Paul Adrian Glaubitz
- Re: Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1
  - From: Geert Uytterhoeven
- Re: Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1
  - From: John Paul Adrian Glaubitz
- Re: Calculating array sizes in C - was: Re: Build regressions/improvements in v6.2-rc1
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