6.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Breno Leitao <leitao@xxxxxxxxxx> [ Upstream commit 77461c10819103eaee7b33c744174b32a8c78b40 ] When CONFIG_DQL is not enabled, dql_group should be treated as a dead declaration. However, its current extern declaration assumes the linker will ignore it, which is generally true across most compiler and architecture combinations. But in certain cases, the linker still attempts to resolve the extern struct, even when the associated code is dead, resulting in a linking error. For instance the following error in loongarch64: >> loongarch64-linux-ld: net-sysfs.c:(.text+0x589c): undefined reference to `dql_group' Modify the declaration of the dead object to be an empty declaration instead of an extern. This change will prevent the linker from attempting to resolve an undefined reference. Reported-by: kernel test robot <lkp@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/202409012047.eCaOdfQJ-lkp@xxxxxxxxx/ Fixes: 74293ea1c4db ("net: sysfs: Do not create sysfs for non BQL device") Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> Reviewed-by: Simon Horman <horms@xxxxxxxxxx> Tested-by: Simon Horman <horms@xxxxxxxxxx> # build-tested Link: https://patch.msgid.link/20240902101734.3260455-1-leitao@xxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- net/core/net-sysfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index dc91921da4ea..15ad775ddd3c 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1524,7 +1524,7 @@ static const struct attribute_group dql_group = { }; #else /* Fake declaration, all the code using it should be dead */ -extern const struct attribute_group dql_group; +static const struct attribute_group dql_group = {}; #endif /* CONFIG_BQL */ #ifdef CONFIG_XPS -- 2.43.0
