[PATCH 14/29] x86/boot/e820: Clean up __e820__range_add() a bit

Ingo Molnar posted 29 patches 7 months, 4 weeks ago
There is a newer version of this series
[PATCH 14/29] x86/boot/e820: Clean up __e820__range_add() a bit
Posted by Ingo Molnar 7 months, 4 weeks ago
 - Use 'idx' index variable instead of a weird 'x'
 - Make the error message E820-specific
 - Group the code a bit better

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Shevchenko <andy@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
 arch/x86/kernel/e820.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index ae05161896d4..6e626c4a3817 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -165,17 +165,18 @@ int e820__get_entry_type(u64 start, u64 end)
  */
 static void __init __e820__range_add(struct e820_table *table, u64 start, u64 size, enum e820_type type)
 {
-	int x = table->nr_entries;
+	int idx = table->nr_entries;
 
-	if (x >= ARRAY_SIZE(table->entries)) {
-		pr_err("too many entries; ignoring [mem %#010llx-%#010llx]\n",
-		       start, start + size - 1);
+	if (idx >= ARRAY_SIZE(table->entries)) {
+		pr_err("too many E820 table entries; ignoring [mem %#010llx-%#010llx]\n",
+		       start, start + size-1);
 		return;
 	}
 
-	table->entries[x].addr = start;
-	table->entries[x].size = size;
-	table->entries[x].type = type;
+	table->entries[idx].addr = start;
+	table->entries[idx].size = size;
+	table->entries[idx].type = type;
+
 	table->nr_entries++;
 }
 
-- 
2.45.2
Re: [PATCH 14/29] x86/boot/e820: Clean up __e820__range_add() a bit
Posted by Andy Shevchenko 7 months, 3 weeks ago
On Mon, Apr 21, 2025 at 08:51:54PM +0200, Ingo Molnar wrote:
>  - Use 'idx' index variable instead of a weird 'x'
>  - Make the error message E820-specific
>  - Group the code a bit better

...

> -	if (x >= ARRAY_SIZE(table->entries)) {
> -		pr_err("too many entries; ignoring [mem %#010llx-%#010llx]\n",
> -		       start, start + size - 1);
> +	if (idx >= ARRAY_SIZE(table->entries)) {
> +		pr_err("too many E820 table entries; ignoring [mem %#010llx-%#010llx]\n",
> +		       start, start + size-1);

size - 1 ?

>  		return;
>  	}

-- 
With Best Regards,
Andy Shevchenko
Re: [PATCH 14/29] x86/boot/e820: Clean up __e820__range_add() a bit
Posted by Ingo Molnar 7 months ago
* Andy Shevchenko <andy@kernel.org> wrote:

> On Mon, Apr 21, 2025 at 08:51:54PM +0200, Ingo Molnar wrote:
> >  - Use 'idx' index variable instead of a weird 'x'
> >  - Make the error message E820-specific
> >  - Group the code a bit better
> 
> ...
> 
> > -	if (x >= ARRAY_SIZE(table->entries)) {
> > -		pr_err("too many entries; ignoring [mem %#010llx-%#010llx]\n",
> > -		       start, start + size - 1);
> > +	if (idx >= ARRAY_SIZE(table->entries)) {
> > +		pr_err("too many E820 table entries; ignoring [mem %#010llx-%#010llx]\n",
> > +		       start, start + size-1);
> 
> size - 1 ?

Not in this case, see:

	https://lore.kernel.org/r/aCW-qKOYJWRLYgpx@gmail.com

Thanks,

	Ingo