diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2025-04-23 18:48:16 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2025-04-28 13:21:18 +0200 |
| commit | fa26198d30f3cdd7627ce47362057848219de765 (patch) | |
| tree | 22ad69bb3b5773bc85f0dcc9c49e97c8f7cb6e7f | |
| parent | 21c03574df19f0d77cb2e4d28bc02c79b21e656a (diff) | |
iommu/io-pgtable-arm: dynamically allocate selftest device struct
In general a 'struct device' is way too large to be put on the kernel
stack. Apparently something just caused it to grow a slightly larger,
which pushed the arm_lpae_do_selftests() function over the warning
limit in some configurations:
drivers/iommu/io-pgtable-arm.c:1423:19: error: stack frame size (1032) exceeds limit (1024) in 'arm_lpae_do_selftests' [-Werror,-Wframe-larger-than]
1423 | static int __init arm_lpae_do_selftests(void)
| ^
Change the function to use a dynamically allocated faux_device
instead of the on-stack device structure.
Fixes: ca25ec247aad ("iommu/io-pgtable-arm: Remove iommu_dev==NULL special case")
Link: https://lore.kernel.org/all/ab75a444-22a1-47f5-b3c0-253660395b5a@arm.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20250423164826.2931382-1-arnd@kernel.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/io-pgtable-arm.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 545229cf62d2..bbd42323c029 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -13,6 +13,7 @@ #include <linux/bitops.h> #include <linux/io-pgtable.h> #include <linux/kernel.h> +#include <linux/device/faux.h> #include <linux/sizes.h> #include <linux/slab.h> #include <linux/types.h> @@ -1437,15 +1438,17 @@ static int __init arm_lpae_do_selftests(void) }; int i, j, k, pass = 0, fail = 0; - struct device dev; + struct faux_device *dev; struct io_pgtable_cfg cfg = { .tlb = &dummy_tlb_ops, .coherent_walk = true, - .iommu_dev = &dev, }; - /* __arm_lpae_alloc_pages() merely needs dev_to_node() to work */ - set_dev_node(&dev, NUMA_NO_NODE); + dev = faux_device_create("io-pgtable-test", NULL, 0); + if (!dev) + return -ENOMEM; + + cfg.iommu_dev = &dev->dev; for (i = 0; i < ARRAY_SIZE(pgsize); ++i) { for (j = 0; j < ARRAY_SIZE(address_size); ++j) { @@ -1465,6 +1468,8 @@ static int __init arm_lpae_do_selftests(void) } pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail); + faux_device_destroy(dev); + return fail ? -EFAULT : 0; } subsys_initcall(arm_lpae_do_selftests); |