linux-kernel - Re: [PATCH 2/2 V2] Support kdump when AMD secure memory encryption is active

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Message-ID: <201806142024.WDGkcZ5I%fengguang.wu@intel.com>
Date:   Thu, 14 Jun 2018 20:55:06 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Lianbo Jiang <lijiang@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, thomas.lendacky@....com,
        dyoung@...hat.com
Subject: Re: [PATCH 2/2 V2] Support kdump when AMD secure memory encryption
 is active

Hi Lianbo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17 next-20180614]
[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/Lianbo-Jiang/Support-kdump-for-AMD-secure-memory-encryption-sme/20180614-164938
config: i386-randconfig-c0-06141337 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/proc/vmcore.o: In function `read_from_oldmem':
>> fs/proc/vmcore.c:127: undefined reference to `copy_oldmem_page_encrypted'

vim +127 fs/proc/vmcore.c

   100	
   101	/* Reads a page from the oldmem device from given offset. */
   102	static ssize_t read_from_oldmem(char *buf, size_t count,
   103					u64 *ppos, int userbuf,
   104					bool encrypted)
   105	{
   106		unsigned long pfn, offset;
   107		size_t nr_bytes;
   108		ssize_t read = 0, tmp;
   109	
   110		if (!count)
   111			return 0;
   112	
   113		offset = (unsigned long)(*ppos % PAGE_SIZE);
   114		pfn = (unsigned long)(*ppos / PAGE_SIZE);
   115	
   116		do {
   117			if (count > (PAGE_SIZE - offset))
   118				nr_bytes = PAGE_SIZE - offset;
   119			else
   120				nr_bytes = count;
   121	
   122			/* If pfn is not ram, return zeros for sparse dump files */
   123			if (pfn_is_ram(pfn) == 0)
   124				memset(buf, 0, nr_bytes);
   125			else {
   126				if (encrypted)
 > 127					tmp = copy_oldmem_page_encrypted(pfn, buf,
   128						       nr_bytes, offset, userbuf);
   129				else
   130					tmp = copy_oldmem_page(pfn, buf, nr_bytes,
   131							offset, userbuf);
   132	
   133				if (tmp < 0)
   134					return tmp;
   135			}
   136			*ppos += nr_bytes;
   137			count -= nr_bytes;
   138			buf += nr_bytes;
   139			read += nr_bytes;
   140			++pfn;
   141			offset = 0;
   142		} while (count);
   143	
   144		return read;
   145	}
   146	

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https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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