When neither CONFIG_PCI nor CONFIG_IBMVIO is enabled:
../arch/powerpc/kernel/iommu.c:178:30: error: 'fail_iommu_bus_notifier' defined
but not used [-Werror=unused-variable]
178 | static struct notifier_block fail_iommu_bus_notifier = {
If only that struct is bounded by 2 #if defined() phrases (PCI && IBMVIO):
../arch/powerpc/kernel/iommu.c:162:12: error: 'fail_iommu_bus_notify' defined
but not used [-Werror=unused-function]
162 | static int fail_iommu_bus_notify(struct notifier_block *nb,
If that function is also guarded by 2 #if defined() phrases:
In file included from ../include/linux/dma-mapping.h:7,
from ../arch/powerpc/kernel/iommu.c:19:
../include/linux/device.h:131:26: error: 'dev_attr_fail_iommu' defined but not
used [-Werror=unused-variable]
131 | struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
../arch/powerpc/kernel/iommu.c:160:8: note: in expansion of macro
'DEVICE_ATTR_RW'
160 | static DEVICE_ATTR_RW(fail_iommu);
and the snowball continues to grow.
Next I got this one:
../arch/powerpc/kernel/iommu.c: In function 'iommu_range_alloc':
../arch/powerpc/kernel/iommu.c:234:6: error: implicit declaration of function
'should_fail_iommu'; did you mean 'should_failslab'?
[-Werror=implicit-function-declaration]
234 | if (should_fail_iommu(dev))
and
../arch/powerpc/kernel/iommu.c: In function 'should_fail_iommu':
../arch/powerpc/kernel/iommu.c:122:50: error: 'fail_iommu' undeclared (first
use in this function)
122 | return dev->archdata.fail_iommu && should_fail(&fail_iommu, 1);
So combine CONFIG_FAIL_IOMMU && (CONFIG_PCI || CONFIG_IBMVIO)
to decide on building some of this code/data.
This came from a .config file from the kernel test robot, but it was
not for this particular build problem.
Fixes: d6b9a81b2a45 ("powerpc: IOMMU fault injection")
Reported-by: kernel test robot <l...@intel.com>
Signed-off-by: Randy Dunlap <rdun...@infradead.org>
Cc: Michael Ellerman <m...@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Anton Blanchard <an...@samba.org>
---
Found/seen in v5.12-rc1.
arch/powerpc/kernel/iommu.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- lnx-512-rc1.orig/arch/powerpc/kernel/iommu.c
+++ lnx-512-rc1/arch/powerpc/kernel/iommu.c
@@ -115,7 +115,13 @@ static int __init setup_iommu_pool_hash(
}
subsys_initcall(setup_iommu_pool_hash);
-#ifdef CONFIG_FAIL_IOMMU
+#if defined(CONFIG_FAIL_IOMMU) && \
+ (defined(CONFIG_PCI) || defined(CONFIG_IBMVIO))
+
+static bool should_fail_iommu(struct device *dev)
+{
+ return dev->archdata.fail_iommu && should_fail(&fail_iommu, 1);
+}
static DECLARE_FAULT_ATTR(fail_iommu);
@@ -125,11 +131,6 @@ static int __init setup_fail_iommu(char
}
__setup("fail_iommu=", setup_fail_iommu);
-static bool should_fail_iommu(struct device *dev)
-{
- return dev->archdata.fail_iommu && should_fail(&fail_iommu, 1);
-}
-
static int __init fail_iommu_debugfs(void)
{
struct dentry *dir = fault_create_debugfs_attr("fail_iommu",
