linux-kernel - [PATCH 4.14 175/211] ARM: 8904/1: skip nomap memblocks while finding the lowmem/highmem boundary

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Message-Id: <20191127203110.381286961@linuxfoundation.org>
Date:   Wed, 27 Nov 2019 21:31:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chester Lin <clin@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 4.14 175/211] ARM: 8904/1: skip nomap memblocks while finding the lowmem/highmem boundary

From: Chester Lin <clin@...e.com>

commit 1d31999cf04c21709f72ceb17e65b54a401330da upstream.

adjust_lowmem_bounds() checks every memblocks in order to find the boundary
between lowmem and highmem. However some memblocks could be marked as NOMAP
so they are not used by kernel, which should be skipped while calculating
the boundary.

Signed-off-by: Chester Lin <clin@...e.com>
Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mm/mmu.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1195,6 +1195,9 @@ void __init adjust_lowmem_bounds(void)
 		phys_addr_t block_start = reg->base;
 		phys_addr_t block_end = reg->base + reg->size;
 
+		if (memblock_is_nomap(reg))
+			continue;
+
 		if (reg->base < vmalloc_limit) {
 			if (block_end > lowmem_limit)
 				/*