5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ross Stutterheim ross.stutterheim@garmin.com
commit 96e0b355883006554a0bee3697da475971d6bba8 upstream.
arm/memremap: fix arch_memremap_can_ram_remap()
commit 260364d112bc ("arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map") added the definition of arch_memremap_can_ram_remap() for arm[64] specific filtering of what pages can be used from the linear mapping. memblock_is_map_memory() was called with the pfn of the address given to arch_memremap_can_ram_remap(); however, memblock_is_map_memory() expects to be given an address for arm, not a pfn.
This results in calls to memremap() returning a newly mapped area when it should return an address in the existing linear mapping.
Fix this by removing the address to pfn translation and pass the address directly.
Fixes: 260364d112bc ("arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map") Signed-off-by: Ross Stutterheim ross.stutterheim@garmin.com Cc: Mike Rapoport rppt@kernel.org Cc: stable@vger.kernel.org Reviewed-by: Catalin Marinas catalin.marinas@arm.com Reviewed-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Russell King (Oracle) rmk+kernel@armlinux.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm/mm/ioremap.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
--- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -483,7 +483,5 @@ void __init early_ioremap_init(void) bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size, unsigned long flags) { - unsigned long pfn = PHYS_PFN(offset); - - return memblock_is_map_memory(pfn); + return memblock_is_map_memory(offset); }