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Date: Thu, 1 Feb 2024 06:37:49 +0800
From: kernel test robot <lkp@intel.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>,
	Andrew Morton <akpm@linux-foundation.org>,
	Kees Cook <keescook@chromium.org>
Cc: oe-kbuild-all@lists.linux.dev,
	Linux Memory Management List <linux-mm@kvack.org>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>,
	linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/5] mm: ptdump: Have ptdump_check_wx() return bool
Message-ID: <202402010618.9izDkpGF-lkp@intel.com>
References: <7943149fe955458cb7b57cd483bf41a3aad94684.1706610398.git.christophe.leroy@csgroup.eu>
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In-Reply-To: <7943149fe955458cb7b57cd483bf41a3aad94684.1706610398.git.christophe.leroy@csgroup.eu>

Hi Christophe,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Christophe-Leroy/arm-ptdump-Rename-CONFIG_DEBUG_WX-to-CONFIG_ARM_DEBUG_WX/20240130-183913
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/7943149fe955458cb7b57cd483bf41a3aad94684.1706610398.git.christophe.leroy%40csgroup.eu
patch subject: [PATCH v2 4/5] mm: ptdump: Have ptdump_check_wx() return bool
config: i386-randconfig-141-20240131 (https://download.01.org/0day-ci/archive/20240201/202402010618.9izDkpGF-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240201/202402010618.9izDkpGF-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402010618.9izDkpGF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/x86/mm/dump_pagetables.c:365:6: error: cannot combine with previous 'type-name' declaration specifier
     365 | bool void ptdump_walk_pgd_level_core(struct seq_file *m,
         |      ^
>> arch/x86/mm/dump_pagetables.c:365:11: warning: no previous prototype for function 'ptdump_walk_pgd_level_core' [-Wmissing-prototypes]
     365 | bool void ptdump_walk_pgd_level_core(struct seq_file *m,
         |           ^
   arch/x86/mm/dump_pagetables.c:365:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     365 | bool void ptdump_walk_pgd_level_core(struct seq_file *m,
         | ^
         | static 
   1 warning and 1 error generated.


vim +/ptdump_walk_pgd_level_core +365 arch/x86/mm/dump_pagetables.c

   364	
 > 365	bool void ptdump_walk_pgd_level_core(struct seq_file *m,
   366					       struct mm_struct *mm, pgd_t *pgd,
   367					       bool checkwx, bool dmesg)
   368	{
   369		const struct ptdump_range ptdump_ranges[] = {
   370	#ifdef CONFIG_X86_64
   371		{0, PTRS_PER_PGD * PGD_LEVEL_MULT / 2},
   372		{GUARD_HOLE_END_ADDR, ~0UL},
   373	#else
   374		{0, ~0UL},
   375	#endif
   376		{0, 0}
   377	};
   378	
   379		struct pg_state st = {
   380			.ptdump = {
   381				.note_page	= note_page,
   382				.effective_prot = effective_prot,
   383				.range		= ptdump_ranges
   384			},
   385			.level = -1,
   386			.to_dmesg	= dmesg,
   387			.check_wx	= checkwx,
   388			.seq		= m
   389		};
   390	
   391		ptdump_walk_pgd(&st.ptdump, mm, pgd);
   392	
   393		if (!checkwx)
   394			return true;
   395		if (st.wx_pages) {
   396			pr_info("x86/mm: Checked W+X mappings: FAILED, %lu W+X pages found.\n",
   397				st.wx_pages);
   398	
   399			return false;
   400		} else {
   401			pr_info("x86/mm: Checked W+X mappings: passed, no W+X pages found.\n");
   402	
   403			return true;
   404		}
   405	}
   406	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki