linux-kernel - Re: [PATCH] vt: don't use kmalloc() for the unicode screen buffer

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Message-ID: <202003290757.eMJRc1HG%lkp@intel.com>
Date:   Sun, 29 Mar 2020 07:35:19 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nicolas Pitre <nico@...xnic.net>
Cc:     kbuild-all@...ts.01.org,
        "gregkh@...uxfoundation.org, Chen Wandun" <chenwandun@...wei.com>,
        Adam Borowski <kilobyte@...band.pl>, jslaby@...e.com,
        daniel.vetter@...ll.ch, sam@...nborg.org, b.zolnierkie@...sung.com,
        lukas@...ner.de, ghalat@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vt: don't use kmalloc() for the unicode screen buffer

Hi Nicolas,

I love your patch! Yet something to improve:

[auto build test ERROR on tty/tty-testing]
[also build test ERROR on v5.6-rc7 next-20200327]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Nicolas-Pitre/vt-don-t-use-kmalloc-for-the-unicode-screen-buffer/20200329-060123
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
config: mips-fuloong2e_defconfig (attached as .config)
compiler: mips64el-linux-gcc (GCC) 5.5.0
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=5.5.0 make.cross ARCH=mips 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All error/warnings (new ones prefixed by >>):

   drivers/tty/vt/vt.c: In function 'vc_uniscr_alloc':
>> drivers/tty/vt/vt.c:353:6: error: implicit declaration of function 'vmalloc' [-Werror=implicit-function-declaration]
     p = vmalloc(memsize);
         ^
>> drivers/tty/vt/vt.c:353:4: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     p = vmalloc(memsize);
       ^
   drivers/tty/vt/vt.c: In function 'vc_uniscr_set':
>> drivers/tty/vt/vt.c:369:2: error: implicit declaration of function 'vfree' [-Werror=implicit-function-declaration]
     vfree(vc->vc_uni_screen);
     ^
   cc1: some warnings being treated as errors

vim +/vmalloc +353 drivers/tty/vt/vt.c

   343	
   344	static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
   345	{
   346		struct uni_screen *uniscr;
   347		void *p;
   348		unsigned int memsize, i;
   349	
   350		/* allocate everything in one go */
   351		memsize = cols * rows * sizeof(char32_t);
   352		memsize += rows * sizeof(char32_t *);
 > 353		p = vmalloc(memsize);
   354		if (!p)
   355			return NULL;
   356	
   357		/* initial line pointers */
   358		uniscr = p;
   359		p = uniscr->lines + rows;
   360		for (i = 0; i < rows; i++) {
   361			uniscr->lines[i] = p;
   362			p += cols * sizeof(char32_t);
   363		}
   364		return uniscr;
   365	}
   366	
   367	static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
   368	{
 > 369		vfree(vc->vc_uni_screen);
   370		vc->vc_uni_screen = new_uniscr;
   371	}
   372	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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