linux-kernel - Re: [PATCH] scripts/mksysmap: skip objtool __pfx

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Message-ID: <20250412102218.560196c0@batman.local.home>
Date: Sat, 12 Apr 2025 10:22:18 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Arnd Bergmann <arnd@...db.de>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Arnd Bergmann <arnd@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>,
 Rae Moar <rmoar@...gle.com>, Shuah Khan <skhan@...uxfoundation.org>, Sergio
 González Collado <sergio.collado@...il.com>, David Gow
 <davidgow@...gle.com>, Nathan Chancellor <nathan@...nel.org>, Nicolas
 Schier <nicolas.schier@...ux.dev>, Mostafa Saleh <smostafa@...gle.com>,
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/mksysmap: skip objtool __pfx_ symbols

On Fri, 11 Apr 2025 12:58:49 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> > This one is 534 characters long:
> > _GLOBAL__sub_I_65535_1_snnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7n  
> 
> I've not seen those before; google seems to suggest this is part of
> static initializers.

I just hit this on my allyesconfig build:

  NM      .tmp_vmlinux1.syms
  KSYMS   .tmp_vmlinux1.kallsyms.S
Symbol __cfi_snnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nnng1h2i3j4k5l6m7ng1h2i3j4k5l6m7nng1h2i3j4k5l6m7ng1h2i3j4k5l6m7n too long for kallsyms (517 >= 512).
Please increase KSYM_NAME_LEN both in kernel and kallsyms.c
  AS      .tmp_vmlinux1.kallsyms.o
  LD      .tmp_vmlinux2
ld.lld: error: kernel image bigger than KERNEL_IMAGE_SIZE
ld.lld: error: kernel image bigger than KERNEL_IMAGE_SIZE
ld.lld: error: kernel image bigger than KERNEL_IMAGE_SIZE
make[3]: *** [/work/build/trace/nobackup/linux-test.git/scripts/Makefile.vmlinux:91: vmlinux.unstripped] Error 1
make[2]: *** [/work/build/trace/nobackup/linux-test.git/Makefile:1239: vmlinux] Error 2
make[1]: *** [/work/build/trace/nobackup/linux-test.git/Makefile:248: __sub-make] Error 2
make[1]: Leaving directory '/work/build/nobackup/tracetest'
make: *** [Makefile:248: __sub-make] Error 2

I grepped for that symbol and it lives in: lib/tests/longest_symbol_kunit.o

Even after removing that test, my allyesconfig still fails to build with:

ld.lld: error: kernel image bigger than KERNEL_IMAGE_SIZE
ld.lld: error: kernel image bigger than KERNEL_IMAGE_SIZE
ld.lld: error: kernel image bigger than KERNEL_IMAGE_SIZE

I guess I'll just have to remove allyesconfig from my test suite. I
still do allmodconfig which appears to still work. At least that will
shorten my test suite time as allyesconfig takes around a half hour to
complete.

-- Steve