Re: arch/x86/mm/pat/memtype.c:128:39: error: use of undeclared identifier 'PG_arch_2'; did you mean 'PG_arch_1'?

[Matthew Wilcox <willy@infradead.org>]

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.

> 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@intel.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@linutronix.de>
> :::::: CC: Thomas Gleixner <tglx@linutronix.de>
> 
> -- 
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