linux-kernel - [PATCH v2 2/2] MIPS: Remove a warning when PHYS

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Date:   Tue,  2 Jan 2018 19:53:15 +0100
From:   Mathieu Malaterre <malat@...ian.org>
To:     James Hogan <james.hogan@...s.com>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] MIPS: Remove a warning when PHYS_OFFSET is 0x0

Rewrite the comparison in `else if` statement, case where `min_low_pfn >
ARCH_PFN_OFFSET` has already been checked in the first `if` statement:

  if (min_low_pfn > ARCH_PFN_OFFSET) {

Fix non-fatal warning during compilation using W=1:

arch/mips/kernel/setup.c: In function ‘bootmem_init’:
arch/mips/kernel/setup.c:461:25: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
  } else if (min_low_pfn < ARCH_PFN_OFFSET) {
                         ^

Reviewed-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
v2: clarify W=1 in commit message
 arch/mips/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 68db4bdd3255..791dc78b132b 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -459,7 +459,7 @@ static void __init bootmem_init(void)
 		pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 			(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 			min_low_pfn - ARCH_PFN_OFFSET);
-	} else if (min_low_pfn < ARCH_PFN_OFFSET) {
+	} else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
 		pr_info("%lu free pages won't be used\n",
 			ARCH_PFN_OFFSET - min_low_pfn);
 	}
-- 
2.11.0