linux-kernel - [PATCH 22/29] x86/boot/e820: Rename gap_start/gap_size to max_gap_start/max_gap_start in e820_search

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Message-ID: <20250421185210.3372306-23-mingo@kernel.org>
Date: Mon, 21 Apr 2025 20:52:02 +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 22/29] x86/boot/e820: Rename gap_start/gap_size to max_gap_start/max_gap_start in e820_search_gap() et al

The PCI gap searching functions pass around pointers to the
gap_start/gap_size variables, which refer to the maximum
size gap found so far.

Rename the variables to say so, and disambiguate their namespace
from 'current gap' variables.

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 | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 24b2e8a93853..d0f9c544a14c 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -680,7 +680,7 @@ static void __init e820__update_table_kexec(void)
 /*
  * Search for a gap in the E820 memory space from 0 to MAX_GAP_END (4GB).
  */
-static int __init e820_search_gap(unsigned long *gap_start, unsigned long *gap_size)
+static int __init e820_search_gap(unsigned long *max_gap_start, unsigned long *max_gap_size)
 {
 	u64 last = MAX_GAP_END;
 	int idx = e820_table->nr_entries;
@@ -697,9 +697,9 @@ static int __init e820_search_gap(unsigned long *gap_start, unsigned long *gap_s
 		if (last > end) {
 			unsigned long gap = last - end;
 
-			if (gap > *gap_size) {
-				*gap_size = gap;
-				*gap_start = end;
+			if (gap > *max_gap_size) {
+				*max_gap_size = gap;
+				*max_gap_start = end;
 				found = 1;
 			}
 		}
@@ -719,29 +719,29 @@ static int __init e820_search_gap(unsigned long *gap_start, unsigned long *gap_s
  */
 __init void e820__setup_pci_gap(void)
 {
-	unsigned long gap_start, gap_size;
+	unsigned long max_gap_start, max_gap_size;
 	int found;
 
-	gap_size = 0x400000;
-	found  = e820_search_gap(&gap_start, &gap_size);
+	max_gap_size = 0x400000;
+	found  = e820_search_gap(&max_gap_start, &max_gap_size);
 
 	if (!found) {
 #ifdef CONFIG_X86_64
-		gap_start = (max_pfn << PAGE_SHIFT) + 1024*1024;
+		max_gap_start = (max_pfn << PAGE_SHIFT) + 1024*1024;
 		pr_err("Cannot find an available gap in the 32-bit address range\n");
 		pr_err("PCI devices with unassigned 32-bit BARs may not work!\n");
 #else
-		gap_start = 0x10000000;
+		max_gap_start = 0x10000000;
 #endif
 	}
 
 	/*
 	 * e820__reserve_resources_late() protects stolen RAM already:
 	 */
-	pci_mem_start = gap_start;
+	pci_mem_start = max_gap_start;
 
 	pr_info("[gap %#010lx-%#010lx] available for PCI devices\n",
-		gap_start, gap_start + gap_size - 1);
+		max_gap_start, max_gap_start + max_gap_size - 1);
 }
 
 /*
-- 
2.45.2