linux-kernel - Re: [PATCH 01/11] riscv: add landing pad for asm routines.

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Message-ID: <20250725152745.GA1724026@google.com>
Date: Fri, 25 Jul 2025 15:27:45 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Deepak Gupta <debug@...osinc.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Monk Chiang <monk.chiang@...ive.com>,
	Kito Cheng <kito.cheng@...ive.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, linux-mm@...ck.org,
	llvm@...ts.linux.dev, rick.p.edgecombe@...el.com,
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	ajones@...tanamicro.com, conor.dooley@...rochip.com,
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	fweimer@...hat.com, jeffreyalaw@...il.com,
	heinrich.schuchardt@...onical.com, andrew@...ive.com,
	ved@...osinc.com
Subject: Re: [PATCH 01/11] riscv: add landing pad for asm routines.

On Thu, Jul 24, 2025 at 04:36:54PM -0700, Deepak Gupta wrote:
> SYM_* macros are used to define assembly routines. In this patch series,
> re-define those macros in risc-v arch specific include file to include
> a landing pad instruction at the beginning. This is done only when the
> compiler flag for landing pad is enabled (i.e. __riscv_zicfilp).
> 
> TODO: Update `lpad 0` with `lpad %lpad_hash(name)` after toolchain
> support.

I glanced through the proposed signature based landing pad labeling
scheme, but didn't see any mentions of lpad_hash for labeling assembly
functions. Is there more information somewhere about how this is going
to be implemented?

Sami