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lib/test_hmm: reduce stack usage

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The various test ioctl handlers use arrays of 64 integers that add up to
1KiB of stack data, which in turn leads to exceeding the warning limit in
some configurations:

lib/test_hmm.c:935:12: error: stack frame size (1408) exceeds limit (1280)
in 'dmirror_migrate_to_device' [-Werror,-Wframe-larger-than]

Use half the size for these arrays, in order to stay under the warning
limits.  The code can already deal with arbitrary lengths, but this may be
a little less efficient.

Link: https://lkml.kernel.org/r/20250610092159.2639515-1-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Arnd Bergmann 2025-06-10 11:21:50 +02:00 • committed by Andrew Morton
parent ba78585585
commit 6046a3bed1
1 changed files with 7 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

14
lib/test_hmm.c
View file

@ -330,7 +330,7 @@ static int dmirror_fault(struct dmirror *dmirror, unsigned long start,
{
struct mm_struct *mm = dmirror->notifier.mm;
unsigned long addr;
unsigned long pfns[64];
unsigned long pfns[32];
struct hmm_range range = {
.notifier = &dmirror->notifier,
.hmm_pfns = pfns,
@ -879,8 +879,8 @@ static int dmirror_migrate_to_system(struct dmirror *dmirror,
unsigned long size = cmd->npages << PAGE_SHIFT;
struct mm_struct *mm = dmirror->notifier.mm;
struct vm_area_struct *vma;
unsigned long src_pfns[64] = { 0 };
unsigned long dst_pfns[64] = { 0 };
unsigned long src_pfns[32] = { 0 };
unsigned long dst_pfns[32] = { 0 };
struct migrate_vma args = { 0 };
unsigned long next;
int ret;
@ -939,8 +939,8 @@ static int dmirror_migrate_to_device(struct dmirror *dmirror,
unsigned long size = cmd->npages << PAGE_SHIFT;
struct mm_struct *mm = dmirror->notifier.mm;
struct vm_area_struct *vma;
unsigned long src_pfns[64] = { 0 };
unsigned long dst_pfns[64] = { 0 };
unsigned long src_pfns[32] = { 0 };
unsigned long dst_pfns[32] = { 0 };
struct dmirror_bounce bounce;
struct migrate_vma args = { 0 };
unsigned long next;
@ -1144,8 +1144,8 @@ static int dmirror_snapshot(struct dmirror *dmirror,
unsigned long size = cmd->npages << PAGE_SHIFT;
unsigned long addr;
unsigned long next;
unsigned long pfns[64];
unsigned char perm[64];
unsigned long pfns[32];
unsigned char perm[32];
char __user *uptr;
struct hmm_range range = {
.hmm_pfns = pfns,