[PATCH 5.10 301/717] MIPS: Dont round up kernel sections size for memblock_add()

Greg Kroah-Hartman
2020-12-28T15:00:29Z

From: Alexander Sverdlin <alexander.sverdlin@nokia.com>

[ Upstream commit d121f125af22a16f0f679293756d28a9691fa46d ]

Linux doesn't own the memory immediately after the kernel image. On Octeon
bootloader places a shared structure right close after the kernel _end,
refer to "struct cvmx_bootinfo *octeon_bootinfo" in cavium-octeon/setup.c.

If check_kernel_sections_mem() rounds the PFNs up, first memblock_alloc()
inside early_init_dt_alloc_memory_arch() <= device_tree_init() returns
memory block overlapping with the above octeon_bootinfo structure, which
is being overwritten afterwards.

Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/mips/kernel/setup.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index ca579deef9391..9d11f68a9e8bb 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -498,8 +498,8 @@ static void __init request_crashkernel(struct resource *res)

static void __init check_kernel_sections_mem(void)
{
- phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
- phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
+ phys_addr_t start = __pa_symbol(&_text);
+ phys_addr_t size = __pa_symbol(&_end) - start;

if (!memblock_is_region_memory(start, size)) {
pr_info("Kernel sections are not in the memory maps\n");
--
2.27.0