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Message-ID: <ZwmvB1+bfWAaSSps@rli9-mobl>
Date: Sat, 12 Oct 2024 07:04:39 +0800
From: Philip Li <philip.li@...el.com>
To: Matthew Wilcox <willy@...radead.org>
CC: kernel test robot <lkp@...el.com>, <llvm@...ts.linux.dev>,
	<oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>, "Andrew
 Morton" <akpm@...ux-foundation.org>, Linux Memory Management List
	<linux-mm@...ck.org>
Subject: Re: arch/x86/mm/pat/memtype.c:128:39: error: use of undeclared
 identifier 'PG_arch_2'; did you mean 'PG_arch_1'?

On Sat, Oct 05, 2024 at 01:20:22PM +0100, Matthew Wilcox wrote:
> On Sat, Oct 05, 2024 at 06:11:14PM +0800, kernel test robot wrote:
> > commit: 7a87225ae2c6c317c7b80cf599e5cf0eee699196 x86: remove PG_uncached
> > date:   4 weeks ago
> > config: x86_64-randconfig-003-20241002 (https://download.01.org/0day-ci/archive/20241005/202410051828.Pb7a79Gu-lkp@intel.com/config)
> 
> Hum, works for me with both gcc and clang-17, but that shouldn't make a
> difference here.  The config has ARCH_USES_PG_ARCH_2 selected.

Sorry for this false report, it can't be reproduced. We will look into
this to resolve the issue in the bot.

> 
> > compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241005/202410051828.Pb7a79Gu-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@...el.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202410051828.Pb7a79Gu-lkp@intel.com/
> > 
> > All errors (new ones prefixed by >>):
> > 
> > >> arch/x86/mm/pat/memtype.c:128:39: error: use of undeclared identifier 'PG_arch_2'; did you mean 'PG_arch_1'?
> >      128 |         unsigned long pg_flags = pg->flags & _PGMT_MASK;
> >          |                                              ^
> >    arch/x86/mm/pat/memtype.c:123:29: note: expanded from macro '_PGMT_MASK'
> >      123 | #define _PGMT_MASK              (1UL << PG_arch_2 | 1UL << PG_arch_1)
> >          |                                         ^
> >    include/linux/page-flags.h:106:2: note: 'PG_arch_1' declared here
> >      106 |         PG_arch_1,
> >          |         ^
> >    arch/x86/mm/pat/memtype.c:134:23: error: use of undeclared identifier 'PG_arch_2'; did you mean 'PG_arch_1'?
> >      134 |         else if (pg_flags == _PGMT_UC_MINUS)
> >          |                              ^
> >    arch/x86/mm/pat/memtype.c:121:33: note: expanded from macro '_PGMT_UC_MINUS'
> >      121 | #define _PGMT_UC_MINUS          (1UL << PG_arch_2)
> >          |                                         ^
> >    include/linux/page-flags.h:106:2: note: 'PG_arch_1' declared here
> >      106 |         PG_arch_1,
> >          |         ^
> >    arch/x86/mm/pat/memtype.c:152:19: error: use of undeclared identifier 'PG_arch_2'; did you mean 'PG_arch_1'?
> >      152 |                 memtype_flags = _PGMT_UC_MINUS;
> >          |                                 ^
> >    arch/x86/mm/pat/memtype.c:121:33: note: expanded from macro '_PGMT_UC_MINUS'
> >      121 | #define _PGMT_UC_MINUS          (1UL << PG_arch_2)
> >          |                                         ^
> >    include/linux/page-flags.h:106:2: note: 'PG_arch_1' declared here
> >      106 |         PG_arch_1,
> >          |         ^
> >    arch/x86/mm/pat/memtype.c:155:19: error: use of undeclared identifier 'PG_arch_2'; did you mean 'PG_arch_1'?
> >      155 |                 memtype_flags = _PGMT_WT;
> >          |                                 ^
> >    arch/x86/mm/pat/memtype.c:122:27: note: expanded from macro '_PGMT_WT'
> >      122 | #define _PGMT_WT                (1UL << PG_arch_2 | 1UL << PG_arch_1)
> >          |                                         ^
> >    include/linux/page-flags.h:106:2: note: 'PG_arch_1' declared here
> >      106 |         PG_arch_1,
> >          |         ^
> >    arch/x86/mm/pat/memtype.c:165:28: error: use of undeclared identifier 'PG_arch_2'; did you mean 'PG_arch_1'?
> >      165 |                 new_flags = (old_flags & _PGMT_CLEAR_MASK) | memtype_flags;
> >          |                                          ^
> >    arch/x86/mm/pat/memtype.c:124:28: note: expanded from macro '_PGMT_CLEAR_MASK'
> >      124 | #define _PGMT_CLEAR_MASK        (~_PGMT_MASK)
> >          |                                   ^
> >    arch/x86/mm/pat/memtype.c:123:29: note: expanded from macro '_PGMT_MASK'
> >      123 | #define _PGMT_MASK              (1UL << PG_arch_2 | 1UL << PG_arch_1)
> >          |                                         ^
> >    include/linux/page-flags.h:106:2: note: 'PG_arch_1' declared here
> >      106 |         PG_arch_1,
> >          |         ^
> >    5 errors generated.
> > 
> > 
> > vim +128 arch/x86/mm/pat/memtype.c
> > 
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  125  
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  126  static inline enum page_cache_mode get_page_memtype(struct page *pg)
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  127  {
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16 @128  	unsigned long pg_flags = pg->flags & _PGMT_MASK;
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  129  
> > 35a5a10411d87e arch/x86/mm/pat.c Toshi Kani      2015-06-04  130  	if (pg_flags == _PGMT_WB)
> > 35a5a10411d87e arch/x86/mm/pat.c Toshi Kani      2015-06-04  131  		return _PAGE_CACHE_MODE_WB;
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  132  	else if (pg_flags == _PGMT_WC)
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  133  		return _PAGE_CACHE_MODE_WC;
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  134  	else if (pg_flags == _PGMT_UC_MINUS)
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  135  		return _PAGE_CACHE_MODE_UC_MINUS;
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  136  	else
> > 35a5a10411d87e arch/x86/mm/pat.c Toshi Kani      2015-06-04  137  		return _PAGE_CACHE_MODE_WT;
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  138  }
> > 0dbcae884779fd arch/x86/mm/pat.c Thomas Gleixner 2014-11-16  139  
> > 
> > :::::: The code at line 128 was first introduced by commit
> > :::::: 0dbcae884779fdf7e2239a97ac7488877f0693d9 x86: mm: Move PAT only functions to mm/pat.c
> > 
> > :::::: TO: Thomas Gleixner <tglx@...utronix.de>
> > :::::: CC: Thomas Gleixner <tglx@...utronix.de>
> > 
> > -- 
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
> 

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