diff mbox series

[02/12] mips: Discard rudiments from bootmem_init

Message ID 20190423224748.3765-3-fancer.lancer@gmail.com (mailing list archive)
State Superseded
Headers show
Series mips: Post-bootmem-memblock transition fixes | expand

Commit Message

Serge Semin April 23, 2019, 10:47 p.m. UTC 
There is a pointless code left in the bootmem_init() method since
the bootmem allocator removal. First part resides the PFN ranges
calculation loop. The conditional expressions and continue operator
are useless there, since nothing is done after them. Second part is
in RAM ranges installation loop. We can simplify the conditions cascade
a bit without much of the logic redefinition, so to reduce the code
length. In particular the end boundary value can be verified after
the possible reduction to be below max_low_pfn.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
---
 arch/mips/kernel/setup.c | 25 +++++--------------------
 1 file changed, 5 insertions(+), 20 deletions(-)

Comments

Paul Burton April 24, 2019, 10:30 p.m. UTC | #1 
Hello,

Serge Semin wrote:
> There is a pointless code left in the bootmem_init() method since
> the bootmem allocator removal. First part resides the PFN ranges
> calculation loop. The conditional expressions and continue operator
> are useless there, since nothing is done after them. Second part is
> in RAM ranges installation loop. We can simplify the conditions cascade
> a bit without much of the logic redefinition, so to reduce the code
> length. In particular the end boundary value can be verified after
> the possible reduction to be below max_low_pfn.
> 
> Signed-off-by: Serge Semin <fancer.lancer@gmail.com>

Applied to mips-next.

Thanks,
    Paul

[ This message was auto-generated; if you believe anything is incorrect
  then please email paul.burton@mips.com to report it. ]
diff mbox series

Patch

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 0ee033c44116..53d93a727d1a 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -394,10 +394,7 @@  static void __init bootmem_init(void)
 	min_low_pfn = ~0UL;
 	max_low_pfn = 0;
 
-	/*
-	 * Find the highest page frame number we have available
-	 * and the lowest used RAM address
-	 */
+	/* Find the highest and lowest page frame numbers we have available. */
 	for (i = 0; i < boot_mem_map.nr_map; i++) {
 		unsigned long start, end;
 
@@ -427,13 +424,6 @@  static void __init bootmem_init(void)
 			max_low_pfn = end;
 		if (start < min_low_pfn)
 			min_low_pfn = start;
-		if (end <= reserved_end)
-			continue;
-#ifdef CONFIG_BLK_DEV_INITRD
-		/* Skip zones before initrd and initrd itself */
-		if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
-			continue;
-#endif
 	}
 
 	if (min_low_pfn >= max_low_pfn)
@@ -474,6 +464,7 @@  static void __init bootmem_init(void)
 		max_low_pfn = PFN_DOWN(HIGHMEM_START);
 	}
 
+	/* Install all valid RAM ranges to the memblock memory region */
 	for (i = 0; i < boot_mem_map.nr_map; i++) {
 		unsigned long start, end;
 
@@ -481,21 +472,15 @@  static void __init bootmem_init(void)
 		end = PFN_DOWN(boot_mem_map.map[i].addr
 				+ boot_mem_map.map[i].size);
 
-		if (start <= min_low_pfn)
+		if (start < min_low_pfn)
 			start = min_low_pfn;
-		if (start >= end)
-			continue;
-
 #ifndef CONFIG_HIGHMEM
+		/* Ignore highmem regions if highmem is unsupported */
 		if (end > max_low_pfn)
 			end = max_low_pfn;
-
-		/*
-		 * ... finally, is the area going away?
-		 */
+#endif
 		if (end <= start)
 			continue;
-#endif
 
 		memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 	}