linux-kernel - [PATCH v1 0/5] riscv: Introduce compat-mode helpers & improve arch_get_mmap

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Message-ID: <20240103160024.70305-2-leobras@redhat.com>
Date: Wed,  3 Jan 2024 13:00:18 -0300
From: Leonardo Bras <leobras@...hat.com>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Eric Biederman <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Leonardo Bras <leobras@...hat.com>,
	Guo Ren <guoren@...nel.org>,
	Andy Chiu <andy.chiu@...ive.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Xiao Wang <xiao.w.wang@...el.com>,
	Vincent Chen <vincent.chen@...ive.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Greg Ungerer <gerg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kemeng Shi <shikemeng@...weicloud.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	David Hildenbrand <david@...hat.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Qinglin Pan <panqinglin2020@...as.ac.cn>,
	Greentime Hu <greentime.hu@...ive.com>,
	Baoquan He <bhe@...hat.com>,
	Clément Léger <cleger@...osinc.com>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v1 0/5] riscv: Introduce compat-mode helpers & improve arch_get_mmap_end()

I just saw the opportunity of optimizing the helper is_compat_task() by
introducing a compile-time test, and it made possible to remove some
#ifdef's without any loss of performance.

I also saw the possibility of removing the direct check of task flags from
general code, and concentrated it in asm/compat.h by creating a few more
helpers, which in the end helped optimize code.

arch_get_mmap_end() just got a simple improvement and some extra docs.

Changes since RFC:
- Fused with other patchset:  Improve arch_get_mmap_end() macro
- Renamed from "Introduce & Optimize compat-mode helpers"

Leonardo Bras (5):
  riscv: Improve arch_get_mmap_end() macro
  riscv: Replace direct thread flag check with is_compat_task()
  riscv: add compile-time test into is_compat_task()
  riscv: Introduce is_compat_thread() into compat.h
  riscv: Introduce set_compat_task() in asm/compat.h

 arch/riscv/include/asm/compat.h    | 19 +++++++++++++++++++
 arch/riscv/include/asm/elf.h       | 11 ++---------
 arch/riscv/include/asm/pgtable.h   |  8 +-------
 arch/riscv/include/asm/processor.h | 16 +++++++++++-----
 arch/riscv/kernel/ptrace.c         |  6 +++---
 5 files changed, 36 insertions(+), 24 deletions(-)


base-commit: 610a9b8f49fbcf1100716370d3b5f6f884a2835a
-- 
2.43.0