linux-kernel - Re: [PATCH v2 1/2] mm/memblock: Add "reserve_mem" to reserved named memory at boot up

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Date: Wed, 12 Jun 2024 11:28:51 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Wei Yang <richard.weiyang@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Lorenzo Stoakes <lstoakes@...il.com>,
 linux-mm@...ck.org, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
 <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin"
 <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>, Kees Cook
 <keescook@...omium.org>, Tony Luck <tony.luck@...el.com>, "Guilherme G.
 Piccoli" <gpiccoli@...lia.com>, linux-hardening@...r.kernel.org, Guenter
 Roeck <linux@...ck-us.net>, Ross Zwisler <zwisler@...gle.com>,
 wklin@...gle.com, Vineeth Remanan Pillai <vineeth@...byteword.org>, Joel
 Fernandes <joel@...lfernandes.org>, Suleiman Souhlal <suleiman@...gle.com>,
 Linus Torvalds <torvalds@...uxfoundation.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Ard Biesheuvel
 <ardb@...nel.org>, Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH v2 1/2] mm/memblock: Add "reserve_mem" to reserved named
 memory at boot up

On Wed, 12 Jun 2024 07:30:49 +0000
Wei Yang <richard.weiyang@...il.com> wrote:

> >+/* Add wildcard region with a lookup name */
> >+static int __init reserved_mem_add(unsigned long start, unsigned long size,
> >+				   const char *name)
> >+{
> >+	struct reserve_mem_table *map;
> >+
> >+	if (!name || !name[0] || strlen(name) >= RESERVE_MEM_NAME_SIZE)
> >+		return -EINVAL;
> >+
> >+	if (reserved_mem_count >= RESERVE_MEM_MAX_ENTRIES)
> >+		return -1;  
> 
> Another thing come to my mind: could we specify several reserve_mem on the
> command line?

Yes, in fact I have this on my command line that I test with:

  reserve_mem=2M:0:oops ramoops.mem_name=oops ramoops.console_size=0x100000 reserve_mem=12M:4096:trace trace_instance=boot_mapped@...ce

> 
> If so, we may need to check whether names conflict.

Yeah, I can add that.

Thanks,

-- Steve