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Wed, 07 Oct 2026 20:24:20 -0700 (PDT) From: Matt Turner Date: Wed, 07 Oct 2026 23:24:08 -0400 Subject: [PATCH v2 5/6] alpha: align hugetlb mappings in arch_get_unmapped_area() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261007-alpha-hugepages-v2-5-8e108af2d961@gmail.com> References: <20261007-alpha-hugepages-v2-0-8e108af2d961@gmail.com> In-Reply-To: <20261007-alpha-hugepages-v2-0-8e108af2d961@gmail.com> To: Richard Henderson , Magnus Lindholm , Axel Rasmussen , Andrew Morton , Peter Xu Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3242; i=mattst88@gmail.com; h=from:subject:message-id; bh=2kMyDbAGY5vdX4Q8C5boz5BouESaSfNKdivc60A8OSU=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLKO81wRnxW2SznMjp/znOve36o89WcSw35cdJ94+b7I/ EkLfGsLOj6yMIhxMcwUU2SJW6/IMqttx1Kf09K/YOawMoEMkRZpYAACFga+3MS8UiMdIz1TbUM9 QyBDxygeIqfHoJFZXFyaWqSbVlDkkJdfkliSmZ9XrJdfkJpXkF6gl5aZVpKRkV9UnAo0Qi8vtcT U1dHNyNDAxNLRwszJwtHUxNnZydDJzdHR2dXJyNLcxMDZ0tHE1dKcgYtTAOYanfUM/zNnzvd/bb Pb9u/6hvi6x5a7C40OznGJecv2Tvajd938NdsYGR61r/Molbhre1QwwHTrpMDEGQ8qHP6+4+E30 NRa2XXhKw8A X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A hugetlb_get_unmapped_area() does not align the address itself; it delegates to mm_get_unmapped_area_vmaflags(), and the huge page alignment is applied by generic_get_unmapped_area() and generic_get_unmapped_area_topdown() via info.align_mask. Alpha defines HAVE_ARCH_UNMAPPED_AREA and supplies its own arch_get_unmapped_area(), which never sets align_mask. An mmap(MAP_HUGETLB) with no address hint would therefore return a merely page-aligned address. That has been the architecture's job since commit 7bd3f1e1a9ae ("mm: make hugetlb mappings go through mm_get_unmapped_area_vmflags"), whose series converted the generic code along with x86, s390, sparc and powerpc. LoongArch, which also has its own arch_get_unmapped_area(), was missed and hit a BUG in LTP's hugefork02 until commit 3109d5ff484b ("LoongArch: Set hugetlb mmap base address aligned with pmd size"). Pass the file down to arch_get_unmapped_area_1() and set align_mask for hugetlbfs mappings, as x86, s390, sparc and loongarch already do. This is a no-op until alpha gains hugetlb support. Reviewed-by: Magnus Lindholm Tested-by: Magnus Lindholm Signed-off-by: Matt Turner --- arch/alpha/kernel/osf_sys.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 7b6543d2cca3..61d806176213 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -1201,14 +1202,16 @@ SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p) /* Get an address range which is currently unmapped. */ static unsigned long -arch_get_unmapped_area_1(unsigned long addr, unsigned long len, - unsigned long limit) +arch_get_unmapped_area_1(struct file *filp, unsigned long addr, + unsigned long len, unsigned long limit) { struct vm_unmapped_area_info info = {}; info.length = len; info.low_limit = addr; info.high_limit = limit; + if (filp && is_file_hugepages(filp)) + info.align_mask = huge_page_mask_align(filp); return vm_unmapped_area(&info); } @@ -1236,19 +1239,20 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, this feature should be incorporated into all ports? */ if (addr) { - addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit); + addr = arch_get_unmapped_area_1 (filp, PAGE_ALIGN(addr), len, + limit); if (addr != (unsigned long) -ENOMEM) return addr; } /* Next, try allocating at TASK_UNMAPPED_BASE. */ - addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE), + addr = arch_get_unmapped_area_1 (filp, PAGE_ALIGN(TASK_UNMAPPED_BASE), len, limit); if (addr != (unsigned long) -ENOMEM) return addr; /* Finally, try allocating in low memory. */ - addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit); + addr = arch_get_unmapped_area_1 (filp, PAGE_SIZE, len, limit); return addr; } -- 2.55.0