[ambarus:saravana-fw-devlink-more-forgiving-v2 7808/7919] arch/arm64/kernel/mte.c:121:15: error: 'mte_enable_kernel_sync' undeclared here (not in a function); did you mean

* [ambarus:saravana-fw-devlink-more-forgiving-v2 7808/7919] arch/arm64/kernel/mte.c:121:15: error: 'mte_enable_kernel_sync' undeclared here (not in a function); did you mean
@ 2021-02-02 21:25 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2021-02-02 21:25 UTC (permalink / raw)
  To: Andrey Konovalov; +Cc: kbuild-all, Andrew Morton, Linux Memory Management List

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tree:   https://github.com/ambarus/linux-0day saravana-fw-devlink-more-forgiving-v2
head:   2c330a32f492512c7e8683ce046c716ecec67681
commit: 56a32b426d272e3ea79af061186f4f81c5958484 [7808/7919] arm64: kasan: export MTE symbols for KASAN tests
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ambarus/linux-0day/commit/56a32b426d272e3ea79af061186f4f81c5958484
        git remote add ambarus https://github.com/ambarus/linux-0day
        git fetch --no-tags ambarus saravana-fw-devlink-more-forgiving-v2
        git checkout 56a32b426d272e3ea79af061186f4f81c5958484
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/arm64/include/asm/lse.h:12,
                    from arch/arm64/include/asm/cmpxchg.h:14,
                    from arch/arm64/include/asm/atomic.h:16,
                    from include/linux/atomic.h:7,
                    from include/asm-generic/bitops/atomic.h:5,
                    from arch/arm64/include/asm/bitops.h:26,
                    from include/linux/bitops.h:32,
                    from arch/arm64/kernel/mte.c:6:
>> arch/arm64/kernel/mte.c:121:15: error: 'mte_enable_kernel_sync' undeclared here (not in a function); did you mean 'mte_enable_kernel'?
     121 | EXPORT_SYMBOL(mte_enable_kernel_sync);
         |               ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/export.h:98:16: note: in definition of macro '___EXPORT_SYMBOL'
      98 |  extern typeof(sym) sym;       \
         |                ^~~
   include/linux/export.h:155:34: note: in expansion of macro '__EXPORT_SYMBOL'
     155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
         |                                  ^~~~~~~~~~~~~~~
   include/linux/export.h:158:29: note: in expansion of macro '_EXPORT_SYMBOL'
     158 | #define EXPORT_SYMBOL(sym)  _EXPORT_SYMBOL(sym, "")
         |                             ^~~~~~~~~~~~~~
   arch/arm64/kernel/mte.c:121:1: note: in expansion of macro 'EXPORT_SYMBOL'
     121 | EXPORT_SYMBOL(mte_enable_kernel_sync);
         | ^~~~~~~~~~~~~

vim +121 arch/arm64/kernel/mte.c

   > 6	#include <linux/bitops.h>
     7	#include <linux/kernel.h>
     8	#include <linux/mm.h>
     9	#include <linux/prctl.h>
    10	#include <linux/sched.h>
    11	#include <linux/sched/mm.h>
    12	#include <linux/string.h>
    13	#include <linux/swap.h>
    14	#include <linux/swapops.h>
    15	#include <linux/thread_info.h>
    16	#include <linux/types.h>
    17	#include <linux/uio.h>
    18	
    19	#include <asm/barrier.h>
    20	#include <asm/cpufeature.h>
    21	#include <asm/mte.h>
    22	#include <asm/ptrace.h>
    23	#include <asm/sysreg.h>
    24	
    25	u64 gcr_kernel_excl __ro_after_init;
    26	
    27	static bool report_fault_once = true;
    28	
    29	static void mte_sync_page_tags(struct page *page, pte_t *ptep, bool check_swap)
    30	{
    31		pte_t old_pte = READ_ONCE(*ptep);
    32	
    33		if (check_swap && is_swap_pte(old_pte)) {
    34			swp_entry_t entry = pte_to_swp_entry(old_pte);
    35	
    36			if (!non_swap_entry(entry) && mte_restore_tags(entry, page))
    37				return;
    38		}
    39	
    40		page_kasan_tag_reset(page);
    41		/*
    42		 * We need smp_wmb() in between setting the flags and clearing the
    43		 * tags because if another thread reads page->flags and builds a
    44		 * tagged address out of it, there is an actual dependency to the
    45		 * memory access, but on the current thread we do not guarantee that
    46		 * the new page->flags are visible before the tags were updated.
    47		 */
    48		smp_wmb();
    49		mte_clear_page_tags(page_address(page));
    50	}
    51	
    52	void mte_sync_tags(pte_t *ptep, pte_t pte)
    53	{
    54		struct page *page = pte_page(pte);
    55		long i, nr_pages = compound_nr(page);
    56		bool check_swap = nr_pages == 1;
    57	
    58		/* if PG_mte_tagged is set, tags have already been initialised */
    59		for (i = 0; i < nr_pages; i++, page++) {
    60			if (!test_and_set_bit(PG_mte_tagged, &page->flags))
    61				mte_sync_page_tags(page, ptep, check_swap);
    62		}
    63	}
    64	
    65	int memcmp_pages(struct page *page1, struct page *page2)
    66	{
    67		char *addr1, *addr2;
    68		int ret;
    69	
    70		addr1 = page_address(page1);
    71		addr2 = page_address(page2);
    72		ret = memcmp(addr1, addr2, PAGE_SIZE);
    73	
    74		if (!system_supports_mte() || ret)
    75			return ret;
    76	
    77		/*
    78		 * If the page content is identical but at least one of the pages is
    79		 * tagged, return non-zero to avoid KSM merging. If only one of the
    80		 * pages is tagged, set_pte_at() may zero or change the tags of the
    81		 * other page via mte_sync_tags().
    82		 */
    83		if (test_bit(PG_mte_tagged, &page1->flags) ||
    84		    test_bit(PG_mte_tagged, &page2->flags))
    85			return addr1 != addr2;
    86	
    87		return ret;
    88	}
    89	
    90	void mte_init_tags(u64 max_tag)
    91	{
    92		static bool gcr_kernel_excl_initialized;
    93	
    94		if (!gcr_kernel_excl_initialized) {
    95			/*
    96			 * The format of the tags in KASAN is 0xFF and in MTE is 0xF.
    97			 * This conversion extracts an MTE tag from a KASAN tag.
    98			 */
    99			u64 incl = GENMASK(FIELD_GET(MTE_TAG_MASK >> MTE_TAG_SHIFT,
   100						     max_tag), 0);
   101	
   102			gcr_kernel_excl = ~incl & SYS_GCR_EL1_EXCL_MASK;
   103			gcr_kernel_excl_initialized = true;
   104		}
   105	
   106		/* Enable the kernel exclude mask for random tags generation. */
   107		write_sysreg_s(SYS_GCR_EL1_RRND | gcr_kernel_excl, SYS_GCR_EL1);
   108	}
   109	
   110	void mte_enable_kernel(void)
   111	{
   112		/* Enable MTE Sync Mode for EL1. */
   113		sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC);
   114		isb();
   115	}
   116	
   117	void mte_set_report_once(bool state)
   118	{
   119		WRITE_ONCE(report_fault_once, state);
   120	}
 > 121	EXPORT_SYMBOL(mte_enable_kernel_sync);
   122	EXPORT_SYMBOL(mte_set_report_once);
   123	

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

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