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author | Laura Abbott <labbott@redhat.com> | 2017-01-10 22:35:41 +0100 |
---|---|---|
committer | Will Deacon <will.deacon@arm.com> | 2017-01-11 14:56:49 +0100 |
commit | 2dece445b6dbdaa3d94f38ef44aa1b63bc2a6bb9 (patch) | |
tree | ec3a9b45f2541d3b7e0e371b73add340dbeae0ea /mm/cma.c | |
parent | lib/Kconfig.debug: Add ARCH_HAS_DEBUG_VIRTUAL (diff) | |
download | linux-2dece445b6dbdaa3d94f38ef44aa1b63bc2a6bb9.tar.xz linux-2dece445b6dbdaa3d94f38ef44aa1b63bc2a6bb9.zip |
mm/cma: Cleanup highmem check
6b101e2a3ce4 ("mm/CMA: fix boot regression due to physical address of
high_memory") added checks to use __pa_nodebug on x86 since
CONFIG_DEBUG_VIRTUAL complains about high_memory not being linearlly
mapped. arm64 is now getting support for CONFIG_DEBUG_VIRTUAL as well.
Rather than add an explosion of arches to the #ifdef, switch to an
alternate method to calculate the physical start of highmem using
the page before highmem starts. This avoids the need for the #ifdef and
extra __pa_nodebug calls.
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'mm/cma.c')
-rw-r--r-- | mm/cma.c | 15 |
1 files changed, 5 insertions, 10 deletions
@@ -235,18 +235,13 @@ int __init cma_declare_contiguous(phys_addr_t base, phys_addr_t highmem_start; int ret = 0; -#ifdef CONFIG_X86 /* - * high_memory isn't direct mapped memory so retrieving its physical - * address isn't appropriate. But it would be useful to check the - * physical address of the highmem boundary so it's justifiable to get - * the physical address from it. On x86 there is a validation check for - * this case, so the following workaround is needed to avoid it. + * We can't use __pa(high_memory) directly, since high_memory + * isn't a valid direct map VA, and DEBUG_VIRTUAL will (validly) + * complain. Find the boundary by adding one to the last valid + * address. */ - highmem_start = __pa_nodebug(high_memory); -#else - highmem_start = __pa(high_memory); -#endif + highmem_start = __pa(high_memory - 1) + 1; pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n", __func__, &size, &base, &limit, &alignment); |