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Tue, 27 Aug 2024 22:49:59 -0700 (PDT) From: Charlie Jenkins Date: Tue, 27 Aug 2024 22:49:16 -0700 Subject: [PATCH 10/16] arm: mm: Support MAP_BELOW_HINT MIME-Version: 1.0 Message-Id: <20240827-patches-below_hint_mmap-v1-10-46ff2eb9022d@rivosinc.com> References: <20240827-patches-below_hint_mmap-v1-0-46ff2eb9022d@rivosinc.com> In-Reply-To: <20240827-patches-below_hint_mmap-v1-0-46ff2eb9022d@rivosinc.com> To: Arnd Bergmann , Paul Walmsley , Palmer Dabbelt , Albert Ou , Catalin Marinas , Will Deacon , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Huacai Chen , WANG Xuerui , Russell King , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. 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=1701; i=charlie@rivosinc.com; h=from:subject:message-id; bh=1syBnrvTSOlOGGJG9VxttpQivuBkydj5+eNQ5N/relM=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9q5XfH7+5/NObdD1TC7as2nnrut80uYIpiTE6QKMsStV jRo9UV3lLIwiHEwyIopsvBca2BuvaNfdlS0bALMHFYmkCEMXJwCMJH3iowMbzKLnvWynRbmDQrg 3uNwlaGFp7De9nT0tCfZV9Zxzb2swMjwZeP9u8Jhqpz79ln+TNZVkXSd3DxD3/DEm3BhhnWsrp8 4AQ== X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 X-Rspamd-Queue-Id: F17AA2000C X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: r5x4xrcrwt9fscn4gp6eaw4oi7gfhkzo X-HE-Tag: 1724824201-80306 X-HE-Meta: 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 QWOY3Vtm 1xYp/YphUMX+OyAG1A5jmI3gDAklpPCBhgm2vpzCaG2sQA8n3St5NDYSUVs4uRfbxy3L3es2aHqhzSY8h8TRV8NarIcbiw3WFZ9Swx0PBD9vLYXY5RyIqyQQ+8negSCrK43swpI0Z8xY5ewmo01g4S+0z2r4Z5JasVpLC6Btj/zRzR9eokmtsTYqnT+32UAbkmnBlpS48yDpmp0SyKtinYUMYNal99uYmQ0m1mqcwDjo6q1JeANGyV2f9oUCIPZNjewg0/4KBM0f3T1+zpi0pfakWGssj07Meo9nsImrWb81gWfitx1d5FMVtv4Ow0DUTPCVuFypUTTV/Yq5DQrxomNySpQOk4WOjDSsneFxbZUtvCowuhiwOIrlvz2fcsBWJ6rRjWjMbjbZAINdbyM472jDIdoOdjlM83HJ3MhxvrFvYD3wgXeu3pq0ABA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, 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/arm/mm/mmap.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index d65d0e6ed10a..fa0c79447b78 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -71,6 +71,8 @@ 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 = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; info.align_offset = pgoff << PAGE_SHIFT; return vm_unmapped_area(&info); @@ -122,6 +124,12 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.length = len; info.low_limit = FIRST_USER_ADDRESS; 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 = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; info.align_offset = pgoff << PAGE_SHIFT; addr = vm_unmapped_area(&info); @@ -137,6 +145,8 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.flags = 0; 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); addr = vm_unmapped_area(&info); }