linux-kernel - Re: [PATCH] powerpc/32: Remove powerpc specific definition of 'ptrdiff

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Message-Id: <161806493833.1467223.5146603896377356295.b4-ty@ellerman.id.au>
Date:   Sun, 11 Apr 2021 00:28:58 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/32: Remove powerpc specific definition of 'ptrdiff_t'

On Mon, 5 Apr 2021 09:57:27 +0000 (UTC), Christophe Leroy wrote:
> For unknown reason, old commit d27dfd388715 ("Import pre2.0.8")
> changed 'ptrdiff_t' from 'int' to 'long'.
> 
> GCC expects it as 'int' really, and this leads to the following
> warning when building KFENCE:
> 
>   CC      mm/kfence/report.o
> In file included from ./include/linux/printk.h:7,
>                  from ./include/linux/kernel.h:16,
>                  from mm/kfence/report.c:10:
> mm/kfence/report.c: In function 'kfence_report_error':
> ./include/linux/kern_levels.h:5:18: warning: format '%td' expects argument of type 'ptrdiff_t', but argument 6 has type 'long int' [-Wformat=]
>     5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
>       |                  ^~~~~~
> ./include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
>    11 | #define KERN_ERR KERN_SOH "3" /* error conditions */
>       |                  ^~~~~~~~
> ./include/linux/printk.h:343:9: note: in expansion of macro 'KERN_ERR'
>   343 |  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
>       |         ^~~~~~~~
> mm/kfence/report.c:213:3: note: in expansion of macro 'pr_err'
>   213 |   pr_err("Out-of-bounds %s at 0x%p (%luB %s of kfence-#%td):\n",
>       |   ^~~~~~
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/32: Remove powerpc specific definition of 'ptrdiff_t'
      https://git.kernel.org/powerpc/c/c46bbf5d2defae50d61ddf31502017ee8952af83

cheers