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Message-ID: <CAFULd4byjR7fF2wBUJMH=8_p5sE2vK9SkG=O4sUOjS4x9MUyRw@mail.gmail.com>
Date: Thu, 15 Aug 2024 09:42:51 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the mm tree
On Thu, Aug 15, 2024 at 1:38 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> After merging the mm tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
>
> In file included from include/linux/kcsan-checks.h:13,
> from include/linux/instrumented.h:12,
> from include/asm-generic/bitops/instrumented-atomic.h:14,
> from arch/powerpc/include/asm/bitops.h:321,
> from include/linux/bitops.h:68,
> from arch/powerpc/include/asm/mce.h:12,
> from arch/powerpc/include/asm/paca.h:32,
> from arch/powerpc/include/asm/percpu.h:30,
> from include/linux/err.h:9,
> from arch/powerpc/include/asm/ptrace.h:22,
> from arch/powerpc/kernel/vdso/sigtramp64.S:14:
> include/linux/compiler_attributes.h:55: warning: "__always_inline" redefined
> 55 | #define __always_inline inline __attribute__((__always_inline__))
> |
> In file included from include/linux/stddef.h:5,
> from include/linux/string.h:9,
> from arch/powerpc/include/asm/paca.h:16:
> include/uapi/linux/stddef.h:8: note: this is the location of the previous definition
> 8 | #define __always_inline inline
> |
> include/linux/compiler_attributes.h:91:20: error: missing binary operator before token "("
> 91 | #if __has_attribute(__copy__)
> | ^
> include/linux/compiler_attributes.h:104:20: error: missing binary operator before token "("
> 104 | #if __has_attribute(__counted_by__)
> | ^
> include/linux/compiler_attributes.h:107: warning: "__counted_by" redefined
> 107 | # define __counted_by(member)
> |
> include/uapi/linux/stddef.h:55: note: this is the location of the previous definition
> 55 | #define __counted_by(m)
> |
> include/linux/compiler_attributes.h:116:20: error: missing binary operator before token "("
> 116 | #if __has_attribute(__diagnose_as_builtin__)
> | ^
> include/linux/compiler_attributes.h:139:20: error: missing binary operator before token "("
> 139 | #if __has_attribute(__designated_init__)
> | ^
> include/linux/compiler_attributes.h:150:20: error: missing binary operator before token "("
> 150 | #if __has_attribute(__error__)
> | ^
> include/linux/compiler_attributes.h:161:20: error: missing binary operator before token "("
> 161 | #if __has_attribute(__externally_visible__)
> | ^
> include/linux/compiler_attributes.h:198:20: error: missing binary operator before token "("
> 198 | #if __has_attribute(__no_caller_saved_registers__)
> | ^
> include/linux/compiler_attributes.h:209:20: error: missing binary operator before token "("
> 209 | #if __has_attribute(__noclone__)
> | ^
> include/linux/compiler_attributes.h:226:20: error: missing binary operator before token "("
> 226 | #if __has_attribute(__fallthrough__)
> | ^
> include/linux/compiler_attributes.h:252:20: error: missing binary operator before token "("
> 252 | #if __has_attribute(__nonstring__)
> | ^
> include/linux/compiler_attributes.h:264:20: error: missing binary operator before token "("
> 264 | #if __has_attribute(__no_profile_instrument_function__)
> | ^
> include/linux/compiler_attributes.h:283:20: error: missing binary operator before token "("
> 283 | #if __has_attribute(__no_stack_protector__)
> | ^
> include/linux/compiler_attributes.h:294:20: error: missing binary operator before token "("
> 294 | #if __has_attribute(__overloadable__)
> | ^
> include/linux/compiler_attributes.h:313:20: error: missing binary operator before token "("
> 313 | #if __has_attribute(__pass_dynamic_object_size__)
> | ^
> include/linux/compiler_attributes.h:318:20: error: missing binary operator before token "("
> 318 | #if __has_attribute(__pass_object_size__)
> | ^
> include/linux/compiler_attributes.h:342:20: error: missing binary operator before token "("
> 342 | #if __has_attribute(__uninitialized__)
> | ^
> include/linux/compiler_attributes.h:388:20: error: missing binary operator before token "("
> 388 | #if __has_attribute(__warning__)
> | ^
> include/linux/compiler_attributes.h:405:20: error: missing binary operator before token "("
> 405 | #if __has_attribute(disable_sanitizer_instrumentation)
> | ^
>
> Caused by commit
>
> 8e53757638ec ("err.h: add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() functions")
>
> Does include/linux/err.h really need to include asm/percpu.h? __percpu is
> defined in compiler_types.h which is included in every c code compile.
Currently it is not needed, but with the proposed patch [1]
[1] https://lore.kernel.org/lkml/20240812115945.484051-4-ubizjak@gmail.com/
that repurposes __percpu to also include percpu named address
qualifier, it will be needed, because per_cpu_qual will be defined in
include/asm-generic/percpu.h.
I looked a bit at the error and noticed that the error happens when
building VDSO sigtramp64.S that includes:
#include <asm/ptrace.h> /* XXX for __SIGNAL_FRAMESIZE */
The crash happens through this include, so perhaps XXX above marks
some expected problem with the include that my change was unlucky
enough to trigger?
Please note that x86 builds with the mentioned patch without problems.
Uros.
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