linux-kernel - [RFC PATCH 0/4] Introduce & Optimize compat-mode helpers

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Date: Fri, 22 Dec 2023 04:46:00 -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>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andy Chiu <andy.chiu@...ive.com>,
	Greg Ungerer <gerg@...nel.org>,
	Vincent Chen <vincent.chen@...ive.com>,
	Xiao Wang <xiao.w.wang@...el.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Kemeng Shi <shikemeng@...weicloud.com>,
	David Hildenbrand <david@...hat.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Qinglin Pan <panqinglin2020@...as.ac.cn>,
	Greentime Hu <greentime.hu@...ive.com>,
	Björn Töpel <bjorn@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Guo Ren <guoren@...nel.org>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 0/4] Introduce & Optimize compat-mode helpers

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.

Leonardo Bras (4):
  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 |  4 ++--
 arch/riscv/kernel/ptrace.c         |  6 +++---
 5 files changed, 27 insertions(+), 21 deletions(-)


base-commit: 24e0d2e527a39f64caeb2e6be39ad5396fb2da5e
-- 
2.43.0