linux-kernel - [PATCH 08/29] x86/boot/e820: Print E820_TYPE

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Message-ID: <20250421185210.3372306-9-mingo@kernel.org>
Date: Mon, 21 Apr 2025 20:51:48 +0200
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andy@...nel.org>,
	Arnd Bergmann <arnd@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Juergen Gross <jgross@...e.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Rapoport <rppt@...nel.org>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	David Woodhouse <dwmw@...zon.co.uk>
Subject: [PATCH 08/29] x86/boot/e820: Print E820_TYPE_RAM entries as ... RAM entries

So it is a bit weird that the actual RAM entries of the E820 table
are not actually called RAM, but 'usable':

	BIOS-e820: [mem 0x0000000000100000-0x000000007ffdbfff]    1.9 GB usable

'usable' is pretty passive-aggressive in that context and ambiguous,
most E820 entries denote 'usable' address ranges - reserved ranges
may be used by devices, or the platform.

Clarify and disambiguate this by making the boot log entry
explicitly say 'kernel usable RAM':

	BIOS-e820: [mem 0x0000000000100000-0x000000007ffdbfff]    1.9 GB kernel usable RAM

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Andy Shevchenko <andy@...nel.org>
Cc: Arnd Bergmann <arnd@...nel.org>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Rapoport (Microsoft) <rppt@...nel.org>
---
 arch/x86/kernel/e820.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 8ee89962fcbf..99f997ae88dc 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -187,7 +187,7 @@ void __init e820__range_add(u64 start, u64 size, enum e820_type type)
 static void __init e820_print_type(enum e820_type type)
 {
 	switch (type) {
-	case E820_TYPE_RAM:		pr_cont(" usable");			break;
+	case E820_TYPE_RAM:		pr_cont(" kernel usable RAM");		break;
 	case E820_TYPE_RESERVED:	pr_cont(" reserved");			break;
 	case E820_TYPE_SOFT_RESERVED:	pr_cont(" soft reserved");		break;
 	case E820_TYPE_ACPI:		pr_cont(" ACPI data");			break;
-- 
2.45.2