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author | Qiuxu Zhuo <qiuxu.zhuo@intel.com> | 2019-03-21 15:13:39 -0700 |
---|---|---|
committer | Borislav Petkov <bp@suse.de> | 2019-03-23 09:43:50 +0100 |
commit | fe783516e3016652b74ac92fb8b3fc2b1c0e9d5b (patch) | |
tree | 3c596f21fbb8991ecaa3801a7ef618d43f4ce3cf /drivers/edac/skx_common.c | |
parent | 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff) | |
download | linux-stable-fe783516e3016652b74ac92fb8b3fc2b1c0e9d5b.tar.gz linux-stable-fe783516e3016652b74ac92fb8b3fc2b1c0e9d5b.tar.bz2 linux-stable-fe783516e3016652b74ac92fb8b3fc2b1c0e9d5b.zip |
EDAC, skx, i10nm: Make skx_common.c a pure library
The following Kconfig constellations fail randconfig builds:
CONFIG_ACPI_NFIT=y
CONFIG_EDAC_DEBUG=y
CONFIG_EDAC_SKX=m
CONFIG_EDAC_I10NM=y
or
CONFIG_ACPI_NFIT=y
CONFIG_EDAC_DEBUG=y
CONFIG_EDAC_SKX=y
CONFIG_EDAC_I10NM=m
with:
...
CC [M] drivers/edac/skx_common.o
...
.../skx_common.o:.../skx_common.c:672: undefined reference to `__this_module'
That is because if one of the two drivers - skx_edac or i10nm_edac - is
built-in and the other one is a module, the shared file skx_common.c
gets linked into a module object by kbuild. Therefore, when linking that
same file into vmlinux, the '__this_module' symbol used in debugfs isn't
defined, leading to the above error.
Fix it by moving all debugfs code from skx_common.c to both skx_base.c
and i10nm_base.c respectively. Thus, skx_common.c doesn't refer to the
'__this_module' symbol anymore.
Clarify skx_common.c's purpose at the top of the file for future
reference, while at it.
[ bp: Make text more readable. ]
Fixes: d4dc89d069aa ("EDAC, i10nm: Add a driver for Intel 10nm server processors")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: https://lkml.kernel.org/r/20190321221339.GA32323@agluck-desk
Diffstat (limited to 'drivers/edac/skx_common.c')
-rw-r--r-- | drivers/edac/skx_common.c | 57 |
1 files changed, 10 insertions, 47 deletions
diff --git a/drivers/edac/skx_common.c b/drivers/edac/skx_common.c index 0e96e7b5b0a7..b0dddcfa9baa 100644 --- a/drivers/edac/skx_common.c +++ b/drivers/edac/skx_common.c @@ -1,7 +1,15 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Common codes for both the skx_edac driver and Intel 10nm server EDAC driver. - * Originally split out from the skx_edac driver. + * + * Shared code by both skx_edac and i10nm_edac. Originally split out + * from the skx_edac driver. + * + * This file is linked into both skx_edac and i10nm_edac drivers. In + * order to avoid link errors, this file must be like a pure library + * without including symbols and defines which would otherwise conflict, + * when linked once into a module and into a built-in object, at the + * same time. For example, __this_module symbol references when that + * file is being linked into a built-in object. * * Copyright (c) 2018, Intel Corporation. */ @@ -644,48 +652,3 @@ void skx_remove(void) kfree(d); } } - -#ifdef CONFIG_EDAC_DEBUG -/* - * Debug feature. - * Exercise the address decode logic by writing an address to - * /sys/kernel/debug/edac/dirname/addr. - */ -static struct dentry *skx_test; - -static int debugfs_u64_set(void *data, u64 val) -{ - struct mce m; - - pr_warn_once("Fake error to 0x%llx injected via debugfs\n", val); - - memset(&m, 0, sizeof(m)); - /* ADDRV + MemRd + Unknown channel */ - m.status = MCI_STATUS_ADDRV + 0x90; - /* One corrected error */ - m.status |= BIT_ULL(MCI_STATUS_CEC_SHIFT); - m.addr = val; - skx_mce_check_error(NULL, 0, &m); - - return 0; -} -DEFINE_SIMPLE_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n"); - -void setup_skx_debug(const char *dirname) -{ - skx_test = edac_debugfs_create_dir(dirname); - if (!skx_test) - return; - - if (!edac_debugfs_create_file("addr", 0200, skx_test, - NULL, &fops_u64_wo)) { - debugfs_remove(skx_test); - skx_test = NULL; - } -} - -void teardown_skx_debug(void) -{ - debugfs_remove_recursive(skx_test); -} -#endif /*CONFIG_EDAC_DEBUG*/ |