The following commit has been merged into the x86/boot branch of tip:
Commit-ID: fa06d58805c88f76f4454284c1e9e8334b559e30
Gitweb: https://git.kernel.org/tip/fa06d58805c88f76f4454284c1e9e8334b559e30
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Thu, 15 May 2025 14:05:24 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Sun, 14 Dec 2025 09:19:38 +01:00
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 'System RAM', like in /proc/iomem:
BIOS-e820: [mem 0x0000000000100000-0x000000007ffdbfff] 1.9 GB System RAM
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Shevchenko <andy@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://patch.msgid.link/20250515120549.2820541-9-mingo@kernel.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 5800153..b0efa4b 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -188,7 +188,7 @@ 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(" System 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;