From: David Laight <David.Laight@ACULAB.COM>
To: "'guoren@kernel.org'" <guoren@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"paul.walmsley@sifive.com" <paul.walmsley@sifive.com>,
"palmer@dabbelt.com" <palmer@dabbelt.com>,
"alexghiti@rivosinc.com" <alexghiti@rivosinc.com>,
"charlie@rivosinc.com" <charlie@rivosinc.com>,
"xiao.w.wang@intel.com" <xiao.w.wang@intel.com>,
"david@redhat.com" <david@redhat.com>,
"panqinglin2020@iscas.ac.cn" <panqinglin2020@iscas.ac.cn>,
"rick.p.edgecombe@intel.com" <rick.p.edgecombe@intel.com>,
"willy@infradead.org" <willy@infradead.org>,
"bjorn@rivosinc.com" <bjorn@rivosinc.com>,
"conor.dooley@microchip.com" <conor.dooley@microchip.com>,
"cleger@rivosinc.com" <cleger@rivosinc.com>,
"leobras@redhat.com" <leobras@redhat.com>
Cc: "linux-riscv@lists.infradead.org"
<linux-riscv@lists.infradead.org>,
"Guo Ren" <guoren@linux.alibaba.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH V2 2/4] riscv: mm: Fixup compat arch_get_mmap_end
Date: Fri, 22 Dec 2023 08:59:47 +0000 [thread overview]
Message-ID: <367b05acb90d4a6e898dd34e4254b697@AcuMS.aculab.com> (raw)
In-Reply-To: <20231221154702.2267684-3-guoren@kernel.org>
From: guoren@kernel.org <guoren@kernel.org>
> Sent: 21 December 2023 15:47
>
> From: Guo Ren <guoren@linux.alibaba.com>
>
> When the task is in COMPAT mode, the arch_get_mmap_end should be 2GB,
> not TASK_SIZE_64. The TASK_SIZE has contained is_compat_mode()
> detection, so change the definition of STACK_TOP_MAX to TASK_SIZE
> directly.
Why 2G ?
IIRC for 32-bit native x86 the limit is 3G, but in compat mode
it is (just under) 4G.
There is a special mmap option (for programs like wine) to
limit mmap() to 2G.
David
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next prev parent reply other threads:[~2023-12-22 9:00 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-21 15:46 [PATCH V2 0/4] riscv: mm: Fixup & Optimize COMPAT code guoren
2023-12-21 15:46 ` [PATCH V2 1/4] riscv: mm: Fixup compat mode boot failure guoren
2023-12-22 1:51 ` Leonardo Bras
2023-12-22 2:57 ` Guo Ren
2023-12-22 3:50 ` Charlie Jenkins
2023-12-22 4:32 ` Leonardo Bras
2023-12-22 7:33 ` Guo Ren
2023-12-22 10:58 ` Guo Ren
2023-12-21 15:46 ` [PATCH V2 2/4] riscv: mm: Fixup compat arch_get_mmap_end guoren
2023-12-22 3:34 ` Leonardo Bras
2023-12-22 4:04 ` Charlie Jenkins
2023-12-22 4:23 ` Leonardo Bras
2023-12-22 5:42 ` Charlie Jenkins
2023-12-22 8:27 ` Leonardo Bras
2023-12-22 4:36 ` Guo Ren
2023-12-22 4:26 ` Guo Ren
2023-12-22 4:43 ` Leonardo Bras
2023-12-22 4:50 ` Guo Ren
2023-12-22 5:27 ` Leonardo Bras
2023-12-22 7:20 ` Guo Ren
2023-12-22 7:49 ` Leonardo Bras
2023-12-22 8:59 ` David Laight [this message]
2023-12-22 9:33 ` Guo Ren
2023-12-21 15:47 ` [PATCH V2 3/4] riscv: mm: Remove unused TASK_SIZE_MIN guoren
2023-12-22 4:49 ` Leonardo Bras
2023-12-22 7:16 ` Guo Ren
2023-12-22 7:22 ` Leonardo Bras
2023-12-21 15:47 ` [PATCH V2 4/4] riscv: mm: Optimize TASK_SIZE definition guoren
2023-12-22 5:09 ` Leonardo Bras
2023-12-22 11:25 ` Guo Ren
2023-12-22 11:52 ` David Laight
2023-12-23 2:38 ` Guo Ren
2023-12-23 2:52 ` Guo Ren
2023-12-23 10:31 ` David Laight
2023-12-24 1:24 ` Guo Ren
2023-12-24 14:37 ` David Laight
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