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powerpc/book3s64/hugetlb: Fix disabling hugetlb when fadump is active

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BugLink: https://bugs.launchpad.net/bugs/2111953

[ Upstream commit d629d7a8efc33d05d62f4805c0ffb44727e3d99f ]

Commit 8597538712 ("powerpc/fadump: Do not use hugepages when fadump
is active") disabled hugetlb support when fadump is active by returning
early from hugetlbpage_init():arch/powerpc/mm/hugetlbpage.c and not
populating hpage_shift/HPAGE_SHIFT.

Later, commit 2354ad252b ("powerpc/mm: Update default hugetlb size
early") moved the allocation of hpage_shift/HPAGE_SHIFT to early boot,
which inadvertently re-enabled hugetlb support when fadump is active.

Fix this by implementing hugepages_supported() on powerpc. This ensures
that disabling hugetlb for the fadump kernel is independent of
hpage_shift/HPAGE_SHIFT.

Fixes: 2354ad252b ("powerpc/mm: Update default hugetlb size early")
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241217074640.1064510-1-sourabhjain@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>
This commit is contained in:
Sourabh Jain
2024-12-17 13:16:40 +05:30
committed by Mehmet Basaran
parent 0288b8650f
commit fece2dd4ca
1 changed files with 9 additions and 0 deletions
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arch/powerpc/include/asm/hugetlb.h
+9
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@@ -15,6 +15,15 @@
extern bool hugetlb_disabled;
static inline bool hugepages_supported(void)
{
if (hugetlb_disabled)
return false;
return HPAGE_SHIFT != 0;
}
#define hugepages_supported hugepages_supported
void __init hugetlbpage_init_defaultsize(void);
int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,