On Wed, Oct 22, 2025 at 09:34:52PM +0800, Leon Hwang wrote:
On 2025/10/22 16:20, Greg KH wrote:
On Wed, Oct 22, 2025 at 04:08:45PM +0800, Leon Hwang wrote:
On 22/10/25 15:40, Greg KH wrote:
On Wed, Oct 22, 2025 at 01:51:38PM +0800, Leon Hwang wrote:
Fix the build error:
map_hugetlb.c: In function 'main': map_hugetlb.c:79:25: warning: implicit declaration of function 'default_huge_page_size' [-Wimplicit-function-declaration] 79 | hugepage_size = default_huge_page_size(); | ^~~~~~~~~~~~~~~~~~~~~~ /usr/bin/ld: /tmp/ccYOogvJ.o: in function 'main': map_hugetlb.c:(.text+0x114): undefined reference to 'default_huge_page_size'
According to the latest selftests, 'default_huge_page_size' has been moved to 'vm_util.c'. So fix the error by the same way.
Reviewed-by: Lance Yang lance.yang@linux.dev Signed-off-by: Leon Hwang leon.hwang@linux.dev
tools/testing/selftests/vm/Makefile | 1 + tools/testing/selftests/vm/userfaultfd.c | 24 ------------------------ tools/testing/selftests/vm/vm_util.c | 21 +++++++++++++++++++++ tools/testing/selftests/vm/vm_util.h | 1 + 4 files changed, 23 insertions(+), 24 deletions(-)
What commit id does this fix? And again, why not just take the original
Let me check which commit introduced the fix.
commits instead?
I agree that taking the original commits would be preferable.
However, it might involve quite a few patches to backport, which could be a bit of work.
We can easily take lots of patches, don't worry about the quantity. But it would be good to figure out what caused this to break here, and not in other branches.
Hi Greg,
After checking with 'git blame map_hugetlb.c', the issue was introduced by commit a584c7734a4d (“selftests: mm: fix map_hugetlb failure on 64K page size systems”), which corresponds to upstream commit 91b80cc5b39f. This change appears to have caused the build error in the 6.1.y tree.
Comparing several stable trees shows the following:
- 6.0.y: not backported*
- 6.1.y: backported
- 6.2.y: not backported*
- 6.3.y: not backported*
- 6.4.y: not backported*
- 6.5.y: not backported*
- 6.6.y: backported
- 6.7.y: backported
Given this, it might be preferable to revert a584c7734a4d in 6.1.y for consistency with the other stable trees (6.0.y, 6.2–6.5.y).
Ah, yeah, it looks like this commit was reverted from other stable releases, as it shows up in the following releases:
4.19.310 4.19.315 5.4.272 5.4.277 5.10.213 5.10.218 5.15.152 5.15.160 6.1.82 6.6.18 6.7.6
So a revert would be fine, want to submit it?
thanks,
greg k-h