Le 13/09/2019 à 08:58, Anshuman Khandual a écrit :
On 09/13/2019 11:53 AM, Christophe Leroy wrote:Fix build failure on powerpc. Fix preemption imbalance. Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx> --- mm/arch_pgtable_test.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/arch_pgtable_test.c b/mm/arch_pgtable_test.c index 8b4a92756ad8..f2b3c9ec35fa 100644 --- a/mm/arch_pgtable_test.c +++ b/mm/arch_pgtable_test.c @@ -24,6 +24,7 @@ #include <linux/swap.h> #include <linux/swapops.h> #include <linux/sched/mm.h> +#include <linux/highmem.h>This is okay.#include <asm/pgalloc.h> #include <asm/pgtable.h>@@ -400,6 +401,8 @@ static int __init arch_pgtable_tests_init(void)p4d_clear_tests(p4dp); pgd_clear_tests(mm, pgdp);+ pte_unmap(ptep);+Now the preemption imbalance via pte_alloc_map() path i.e pte_alloc_map() -> pte_offset_map() -> kmap_atomic() Is not this very much powerpc 32 specific or this will be applicable for all platform which uses kmap_XXX() to map high memory ?
See https://elixir.bootlin.com/linux/v5.3-rc8/source/include/linux/highmem.h#L91
I think it applies at least to all arches using the generic implementation. Applies also to arm: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/arm/mm/highmem.c#L52 Applies also to mips: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/mips/mm/highmem.c#L47 Same on sparc: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/sparc/mm/highmem.c#L52 Same on x86: https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/x86/mm/highmem_32.c#L34 I have not checked others, but I guess it is like that for all. Christophe
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