Date:   Thu, 11 Apr 2019 14:48:02 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Sinan Kaya <Okaya@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Adrian Reber <adrian@...as.de>,
        Richard Guy Briggs <rgb@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Changbin Du <changbin.du@...el.com>
Subject: Re: [PATCH v3] init: Do not select DEBUG_KERNEL by default

On Thu, Apr 11, 2019 at 2:44 PM Sinan Kaya <Okaya@...nel.org> wrote:
>
> On 4/11/2019 1:31 AM, Masahiro Yamada wrote:
> >> t looks like CONFIG_KALLSYMS_ALL is the only feature that
> >> requires CONFIG_DEBUG_KERNEL.
> > Which part of KALLSYMS_ALL code requires CONFIG_DEBUG_KERNEL?
> >
>
> I was going by what Kconfig tells me
>
> Symbol: KALLSYMS_ALL [=n]
>   Depends on: DEBUG_KERNEL [=n] && KALLSYMS [=y]

Lots of features have 'depends on DEBUG_KERNEL'.
What is special about KALLSYMS_ALL here?


./drivers/gpio/Kconfig:52: depends on DEBUG_KERNEL
./drivers/pci/Kconfig:69: depends on DEBUG_KERNEL
./drivers/usb/gadget/Kconfig:51: depends on DEBUG_KERNEL
./drivers/base/Kconfig:119: depends on DEBUG_KERNEL
./drivers/base/Kconfig:130: depends on DEBUG_KERNEL
./drivers/base/Kconfig:142: depends on DEBUG_KERNEL
./drivers/spi/Kconfig:29: depends on DEBUG_KERNEL
./drivers/pinctrl/Kconfig:29: depends on DEBUG_KERNEL
./drivers/gpu/drm/Kconfig:55: depends on DEBUG_KERNEL
./kernel/rcu/Kconfig.debug:16: depends on DEBUG_KERNEL
./kernel/rcu/Kconfig.debug:33: depends on DEBUG_KERNEL
./kernel/rcu/Kconfig.debug:61: depends on DEBUG_KERNEL
./kernel/rcu/Kconfig.debug:73: depends on DEBUG_KERNEL
./net/dccp/Kconfig:30: depends on DEBUG_KERNEL=y
./crypto/Kconfig:173: depends on DEBUG_KERNEL && !CRYPTO_MANAGER_DISABLE_TESTS
./init/Kconfig:951: depends on DEBUG_KERNEL
./init/Kconfig:1476: depends on DEBUG_KERNEL && KALLSYMS
./mm/Kconfig.debug:12: depends on DEBUG_KERNEL
./mm/Kconfig.debug:44: depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
./mm/Kconfig.debug:99: depends on DEBUG_KERNEL
./mm/Kconfig:494: depends on DEBUG_KERNEL && CMA
./lib/Kconfig.kgdb:8: depends on DEBUG_KERNEL
./lib/Kconfig.debug:80: depends on DEBUG_KERNEL && PRINTK &&
GENERIC_CALIBRATE_DELAY
./lib/Kconfig.debug:172: depends on DEBUG_KERNEL && !COMPILE_TEST
./lib/Kconfig.debug:264:        depends on DEBUG_KERNEL
./lib/Kconfig.debug:363: depends on DEBUG_KERNEL && (M68K || UML ||
SUPERH) || ARCH_WANT_FRAME_POINTERS
./lib/Kconfig.debug:387: depends on DEBUG_KERNEL
./lib/Kconfig.debug:447: depends on DEBUG_KERNEL
./lib/Kconfig.debug:508: depends on DEBUG_KERNEL && SLAB
./lib/Kconfig.debug:549: depends on DEBUG_KERNEL && HAVE_DEBUG_KMEMLEAK
./lib/Kconfig.debug:614: depends on DEBUG_KERNEL && !IA64
./lib/Kconfig.debug:623: depends on DEBUG_KERNEL
./lib/Kconfig.debug:661: depends on DEBUG_KERNEL && ARCH_HAS_DEBUG_VIRTUAL
./lib/Kconfig.debug:670: depends on DEBUG_KERNEL && !MMU
./lib/Kconfig.debug:712: depends on DEBUG_KERNEL
./lib/Kconfig.debug:723: depends on DEBUG_KERNEL && HIGHMEM
./lib/Kconfig.debug:733: depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
./lib/Kconfig.debug:802: depends on DEBUG_KERNEL
./lib/Kconfig.debug:816: depends on DEBUG_KERNEL && !S390
./lib/Kconfig.debug:868: depends on DEBUG_KERNEL && !S390
./lib/Kconfig.debug:902: depends on DEBUG_KERNEL
./lib/Kconfig.debug:956: depends on DEBUG_KERNEL
./lib/Kconfig.debug:997: depends on DEBUG_KERNEL && PROC_FS
./lib/Kconfig.debug:1010: depends on DEBUG_KERNEL && PROC_FS
./lib/Kconfig.debug:1023: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1048: depends on DEBUG_KERNEL && PREEMPT &&
TRACE_IRQFLAGS_SUPPORT
./lib/Kconfig.debug:1065: depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
./lib/Kconfig.debug:1111: depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
./lib/Kconfig.debug:1133: depends on DEBUG_KERNEL && RT_MUTEXES
./lib/Kconfig.debug:1140: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1150: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1157: depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
./lib/Kconfig.debug:1174: depends on DEBUG_KERNEL && RWSEM_SPIN_ON_OWNER
./lib/Kconfig.debug:1181: depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
./lib/Kconfig.debug:1196: depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
./lib/Kconfig.debug:1207: depends on DEBUG_KERNEL && LOCKDEP
./lib/Kconfig.debug:1216: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1226: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1237: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1308: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1346: depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION
./lib/Kconfig.debug:1355: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1365: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1375: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1385: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1402: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1417: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1444: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1457: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1536: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1615: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1680: depends on DEBUG_KERNEL || m
./lib/Kconfig.debug:1690: depends on DEBUG_KERNEL || m
./lib/Kconfig.debug:1699: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1710: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1724: depends on DEBUG_KERNEL
./lib/Kconfig.debug:1731: depends on DEBUG_KERNEL
./arch/xtensa/Kconfig.debug:5: depends on DEBUG_KERNEL && MMU
./arch/x86/Kconfig.debug:70: depends on DEBUG_KERNEL
./arch/x86/Kconfig.debug:129: depends on DEBUG_KERNEL
./arch/x86/Kconfig.debug:174: depends on DEBUG_KERNEL && KPROBES
./arch/x86/Kconfig.debug:258: depends on DEBUG_KERNEL
./arch/x86/Kconfig.debug:265: depends on DEBUG_KERNEL
./arch/x86/Kconfig.debug:285: depends on DEBUG_KERNEL
./arch/x86/Kconfig.debug:295: depends on DEBUG_KERNEL && X86_LOCAL_APIC
./arch/x86/Kconfig.debug:319: depends on DEBUG_KERNEL
./arch/ia64/Kconfig.debug:23: depends on DEBUG_KERNEL
./arch/ia64/Kconfig.debug:33: depends on DEBUG_KERNEL
./arch/ia64/Kconfig.debug:42: depends on DEBUG_KERNEL
./arch/ia64/Kconfig.debug:51: depends on DEBUG_KERNEL
./arch/s390/Kconfig.debug:8: depends on DEBUG_KERNEL
./arch/powerpc/Kconfig.debug:57: depends on DEBUG_KERNEL
./arch/powerpc/Kconfig.debug:70: depends on DEBUG_KERNEL &&
JUMP_LABEL_FEATURE_CHECKS
./arch/powerpc/Kconfig.debug:79: depends on DEBUG_KERNEL
./arch/powerpc/Kconfig.debug:83: depends on DEBUG_KERNEL
./arch/powerpc/Kconfig.debug:90: depends on DEBUG_KERNEL
./arch/powerpc/Kconfig.debug:127: depends on DEBUG_KERNEL && PPC32
./arch/powerpc/Kconfig.debug:355:        depends on DEBUG_KERNEL && DEBUG_FS
./arch/powerpc/Kconfig.debug:366:        depends on DEBUG_KERNEL &&
PPC_BOOK3S_64
./arch/arm/Kconfig.debug:8: depends on DEBUG_KERNEL
./arch/arm/Kconfig.debug:105: depends on DEBUG_KERNEL
./arch/arm64/Kconfig.debug:7: depends on DEBUG_KERNEL
./arch/unicore32/Kconfig.debug:17: depends on DEBUG_KERNEL
./arch/mips/Kconfig.debug:90: depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
./arch/sh/Kconfig.debug:22: depends on DEBUG_KERNEL && SUPERH32
./arch/sh/Kconfig.debug:31: depends on DEBUG_KERNEL && (MMU || BROKEN)
&& !PAGE_SIZE_64KB
./arch/sh/Kconfig.debug:41: depends on DEBUG_KERNEL && SUPERH32 && BROKEN
./arch/sh/Kconfig.debug:49: depends on DEBUG_KERNEL && SUPERH32
./arch/sh/Kconfig.debug:70: depends on DEBUG_KERNEL



-- 
Best Regards
Masahiro Yamada

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