[PATCH v4 1/3] mm: Change ghes code to allow poison of non-struct pfn

ankita
2025-10-26T14:19:38Z

From: Ankit Agrawal <ankita@nvidia.com>

The GHES code allows calling of memory_failure() on the PFNs that pass the
pfn_valid() check. This contract is broken for the remapped PFNs which
fails the check and ghes_do_memory_failure() returns without triggering
memory_failure().

Update code to allow memory_failure() call on PFNs failing pfn_valid().

Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
---
drivers/acpi/apei/ghes.c | 6 ------
1 file changed, 6 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index a0d54993edb3..bc4d0f2b3e9d 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -505,12 +505,6 @@ static bool ghes_do_memory_failure(u64 physical_addr, int flags)
return false;

pfn = PHYS_PFN(physical_addr);
- if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
- pr_warn_ratelimited(FW_WARN GHES_PFX
- "Invalid address in generic error data: %#llx\n",
- physical_addr);
- return false;
- }

if (flags == MF_ACTION_REQUIRED && current->mm) {
twcb = (void *)gen_pool_alloc(ghes_estatus_pool, sizeof(*twcb));
--
2.34.1