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Miller" , Andreas Larsson , Shuah Khan , Alexandre Ghiti Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Palmer Dabbelt , linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-kselftest@vger.kernel.org, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1730; i=charlie@rivosinc.com; h=from:subject:message-id; bh=LDlOb3puh00G9LsastMFHCdP3tuzGW5CWMac22J4/f0=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9q5XQkTzp+9JuBqJbUp4CZHz86P7jsl/+dUPtx28/aiw uJ/F77s7ShlYRDjYJAVU2ThudbA3HpHv+yoaNkEmDmsTCBDGLg4BWAilewM/zPyq60vOxt27XXL PhSUqxi9dMWuaSXlSf4nvq4JmxBdu5+RYfa1r9wzZq5YzaDtGr2m541pUMtOl1Xnuf/rbZGaqVf Eyg0A X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 18191140017 X-Stat-Signature: apeeb31gmwhya796syoa6fff5kzctep4 X-HE-Tag: 1724824211-533049 X-HE-Meta: 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 Ib/k3MHr JrqSeoINjVGOmGR/6ULBzWpzNx41fSAzXGRGYpxEuYq/iCEEpOyI6iiHaTw/bATsqsddZIoyy5ft4bSsGCTn/fjbLJATc+OChj6sy9THf0x3GvwWWAEI26wnvhsfJaLjiKUiDt6U6CMTnt1uP/qnvQcLqyNsUbPTQdSi2BwVWLCY/8ZAyPL4DOVTnO/QjYmi1DPqcnwoPR1rCqJufCJ+RtQlTTq7JUEhYlGeI06czxDA2wWS8/XdHGppmxifidnn2h0ytIAzFjBqwb/laTh3DwocKGl8F3sOGZRnhVT+chI8O+VENX1mWtQsmGha/zEHEktuvNCree3D61UqO3s8ZsVef47sqkiAeKJTF/WzvFd8N7BGIZjzNys9AgS470z4gzDFHtNqGyxUOS74E0dxlD7k9N1rt/enRSZ10h8oIpjMucKTFiCGrk1J7lQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000009, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add support for MAP_BELOW_HINT to mmap by restricting high_limit to addr when the flag is enabled. Signed-off-by: Charlie Jenkins --- arch/s390/mm/mmap.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index 206756946589..29e20351ca85 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -105,6 +105,8 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, info.length = len; info.low_limit = mm->mmap_base; info.high_limit = TASK_SIZE; + if (flags & MAP_BELOW_HINT) + info.high_limit = MIN(info.high_limit, addr + len); info.align_mask = get_align_mask(filp, flags); info.align_offset = pgoff << PAGE_SHIFT; addr = vm_unmapped_area(&info); @@ -143,6 +145,12 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad info.length = len; info.low_limit = PAGE_SIZE; info.high_limit = mm->mmap_base; + if (flags & MAP_BELOW_HINT) + /* + * Subtract (STACK_TOP - mm->mmap_base) to get random + * offset defined in mmap_base() in mm/util.c + */ + info.high_limit = MIN(info.high_limit, addr + len) - (STACK_TOP - mm->mmap_base); info.align_mask = get_align_mask(filp, flags); info.align_offset = pgoff << PAGE_SHIFT; addr = vm_unmapped_area(&info); @@ -158,6 +166,8 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad info.flags = 0; info.low_limit = TASK_UNMAPPED_BASE; info.high_limit = TASK_SIZE; + if (flags & MAP_BELOW_HINT) + info.high_limit = MIN(TASK_SIZE, addr + len); addr = vm_unmapped_area(&info); if (offset_in_page(addr)) return addr;