linux-kernel - Re: [PATCH] mm/zsmalloc.c: Fix zsmalloc 32-bit PAE support

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Date:   Thu, 13 Dec 2018 15:27:14 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Rafael David Tinoco <rafael.tinoco@...aro.org>
Cc:     kbuild-all@...org, Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Rafael David Tinoco <rafael.tinoco@...aro.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Anthony Yznaga <anthony.yznaga@...cle.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Joerg Roedel <jroedel@...e.de>,
        Juergen Gross <jgross@...e.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Jiri Kosina <jkosina@...e.cz>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH] mm/zsmalloc.c: Fix zsmalloc 32-bit PAE support

Hi Rafael,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc6 next-20181212]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Rafael-David-Tinoco/mm-zsmalloc-c-Fix-zsmalloc-32-bit-PAE-support/20181211-020704
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=xtensa 

All errors (new ones prefixed by >>):

>> mm/zsmalloc.c:112:3: error: #error "MAX_POSSIBLE_PHYSMEM_BITS HAS to be defined by arch using zsmalloc";
     #error "MAX_POSSIBLE_PHYSMEM_BITS HAS to be defined by arch using zsmalloc";
      ^~~~~

vim +112 mm/zsmalloc.c

   103	
   104	/*
   105	 * MAX_POSSIBLE_PHYSMEM_BITS should be defined by all archs using zsmalloc:
   106	 * Trying to guess it from MAX_PHYSMEM_BITS, or considering it BITS_PER_LONG,
   107	 * proved to be wrong by not considering PAE capabilities, or using SPARSEMEM
   108	 * only headers, leading to bad object encoding due to object index overflow.
   109	 */
   110	#ifndef MAX_POSSIBLE_PHYSMEM_BITS
   111	 #define MAX_POSSIBLE_PHYSMEM_BITS BITS_PER_LONG
 > 112	 #error "MAX_POSSIBLE_PHYSMEM_BITS HAS to be defined by arch using zsmalloc";
   113	#else
   114	 #ifndef CONFIG_64BIT
   115	  #if (MAX_POSSIBLE_PHYSMEM_BITS >= (BITS_PER_LONG + PAGE_SHIFT - OBJ_TAG_BITS))
   116	   #error "MAX_POSSIBLE_PHYSMEM_BITS is wrong for this arch";
   117	  #endif
   118	 #endif
   119	#endif
   120	

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