From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com> Cc: <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH v2 1/3] vmalloc: Choose a better start address in vm_area_register_early() Date: Tue, 20 Jul 2021 10:51:03 +0800 [thread overview] Message-ID: <20210720025105.103680-2-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20210720025105.103680-1-wangkefeng.wang@huawei.com> There are some fixed locations in the vmalloc area be reserved in ARM(see iotable_init()) and ARM64(see map_kernel()), but for pcpu_page_first_chunk(), it calls vm_area_register_early() and choose VMALLOC_START as the start address of vmap area which could be conflicted with above address, then could trigger a BUG_ON in vm_area_add_early(). Let's choose the end of existing address range in vmlist as the start address instead of VMALLOC_START to avoid the BUG_ON. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- mm/vmalloc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d5cd52805149..a98cf97f032f 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2238,12 +2238,14 @@ void __init vm_area_add_early(struct vm_struct *vm) */ void __init vm_area_register_early(struct vm_struct *vm, size_t align) { - static size_t vm_init_off __initdata; + unsigned long vm_start = VMALLOC_START; + struct vm_struct *tmp; unsigned long addr; - addr = ALIGN(VMALLOC_START + vm_init_off, align); - vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START; + for (tmp = vmlist; tmp; tmp = tmp->next) + vm_start = (unsigned long)tmp->addr + tmp->size; + addr = ALIGN(vm_start, align); vm->addr = (void *)addr; vm_area_add_early(vm); -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com> Cc: <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH v2 1/3] vmalloc: Choose a better start address in vm_area_register_early() Date: Tue, 20 Jul 2021 10:51:03 +0800 [thread overview] Message-ID: <20210720025105.103680-2-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20210720025105.103680-1-wangkefeng.wang@huawei.com> There are some fixed locations in the vmalloc area be reserved in ARM(see iotable_init()) and ARM64(see map_kernel()), but for pcpu_page_first_chunk(), it calls vm_area_register_early() and choose VMALLOC_START as the start address of vmap area which could be conflicted with above address, then could trigger a BUG_ON in vm_area_add_early(). Let's choose the end of existing address range in vmlist as the start address instead of VMALLOC_START to avoid the BUG_ON. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- mm/vmalloc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d5cd52805149..a98cf97f032f 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2238,12 +2238,14 @@ void __init vm_area_add_early(struct vm_struct *vm) */ void __init vm_area_register_early(struct vm_struct *vm, size_t align) { - static size_t vm_init_off __initdata; + unsigned long vm_start = VMALLOC_START; + struct vm_struct *tmp; unsigned long addr; - addr = ALIGN(VMALLOC_START + vm_init_off, align); - vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START; + for (tmp = vmlist; tmp; tmp = tmp->next) + vm_start = (unsigned long)tmp->addr + tmp->size; + addr = ALIGN(vm_start, align); vm->addr = (void *)addr; vm_area_add_early(vm); -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-20 2:52 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-20 2:51 [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang [this message] 2021-07-20 2:51 ` [PATCH v2 1/3] vmalloc: Choose a better start address in vm_area_register_early() Kefeng Wang 2021-08-01 15:23 ` Catalin Marinas 2021-08-01 15:23 ` Catalin Marinas 2021-08-02 2:39 ` Kefeng Wang 2021-08-02 2:39 ` Kefeng Wang 2021-08-04 11:14 ` Catalin Marinas 2021-08-04 11:14 ` Catalin Marinas 2021-08-05 12:46 ` Kefeng Wang 2021-08-05 12:46 ` Kefeng Wang 2021-07-20 2:51 ` [PATCH v2 2/3] arm64: Support page mapping percpu first chunk allocator Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang 2021-08-01 15:53 ` Catalin Marinas 2021-08-01 15:53 ` Catalin Marinas 2021-08-02 2:47 ` Kefeng Wang 2021-08-02 2:47 ` Kefeng Wang 2021-07-20 2:51 ` [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang 2021-07-22 11:00 ` Marco Elver 2021-07-22 11:00 ` Marco Elver 2021-07-22 12:14 ` Kefeng Wang 2021-07-22 12:14 ` Kefeng Wang 2021-07-26 1:19 ` [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang 2021-07-26 1:19 ` Kefeng Wang
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