arm64/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Let's use one of the type bits: core-mm only supports 5, so there is no need to consume 6. Note that we might be able to reuse bit 1, but reusing bit 1 turned out problematic in the past for PROT_NONE handling; so let's play safe and use another bit. Link: https://lkml.kernel.org/r/20220329164329.208407-5-david@redhat.com ________________________________ 发件人: 陈冠有 发送时间: 2023年9月14日 15:51:31 收件人: crash-utility(a)redhat.com 抄送: lijiang(a)redhat.com; k-hagio-ab(a)nec.com 主题: [PATCH] Fix "vtop" command to display the swapinfo for arm64 kernel 6.1+ #define __SWP_TYPE_SHIFT 3 #define __SWP_TYPE_BITS 5 Before: crash> vtop 70504000 VIRTUAL PHYSICAL 70504000 (not mapped) PAGE DIRECTORY: ffffff80f265c000 PGD: ffffff80f265c008 => 800000141537003 PMD: ffffff8101537c10 => 800000141538003 PTE: ffffff8101538820 => 12bc3e04 PTE vtop: cannot determine swap location After: crash> vtop 70504000 VIRTUAL PHYSICAL 70504000 (not mapped) PAGE DIRECTORY: ffffff80f265c000 PGD: ffffff80f265c008 => 800000141537003 PMD: ffffff8101537c10 => 800000141538003 PTE: ffffff8101538820 => 12bc3e04 PTE SWAP OFFSET 12bc3e04 /first_stage_ramdisk/dev/block/zram0 1227838 VMA START END FLAGS FILE ffffff80dfe7b578 70504000 707bd000 100073 SWAP: /first_stage_ramdisk/dev/block/zram0 OFFSET: 1227838 Signed-off-by: chenguanyou <chenguanyou(a)xiaomi.com&gt; --- arm64.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arm64.c b/arm64.c index 39d5f04..ea1b51b 100644 --- a/arm64.c +++ b/arm64.c @@ -468,8 +468,16 @@ arm64_init(int when) } } - - if (THIS_KERNEL_VERSION >= LINUX(4,0,0)) { + if (THIS_KERNEL_VERSION >= LINUX(6,1,0)) { + ms->__SWP_TYPE_BITS = 5; + ms->__SWP_TYPE_SHIFT = 3; + ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1); + ms->__SWP_OFFSET_SHIFT = (ms->__SWP_TYPE_BITS + ms->__SWP_TYPE_SHIFT); + ms->__SWP_OFFSET_BITS = 50; + ms->__SWP_OFFSET_MASK = ((1UL << ms->__SWP_OFFSET_BITS) - 1); + ms->PTE_PROT_NONE = (1UL << 58); + ms->PTE_FILE = 0; /* unused */ + } else if (THIS_KERNEL_VERSION >= LINUX(4,0,0)) { ms->__SWP_TYPE_BITS = 6; ms->__SWP_TYPE_SHIFT = 2; ms->__SWP_TYPE_MASK = ((1UL << ms->__SWP_TYPE_BITS) - 1); -- 2.39.0 #/******本邮件及其附件含有小米公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ This e-mail and its attachments contain confidential information from XIAOMI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!******/#