lkml.org 
[lkml]   [2020]   [Jun]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 12/13] sched: Define and initialize a flag to identify valid PASID in the task
    Date
    From: Peter Zijlstra <peterz@infradead.org>

    The flag is defined for the task to identify if the task has a valid
    PASID. Its initial value is 0 when the task is forked/cloned. It will
    be used shortly.

    Signed-off-by: Peter Zijlstra <peterz@infradead.org>
    Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
    ---
    v2:
    - Add this patch to define the flag to identify valid PASID MSR (PeterZ)

    include/linux/sched.h | 3 +++
    kernel/fork.c | 4 ++++
    2 files changed, 7 insertions(+)

    diff --git a/include/linux/sched.h b/include/linux/sched.h
    index b62e6aaf28f0..1b5a6e5c74ca 100644
    --- a/include/linux/sched.h
    +++ b/include/linux/sched.h
    @@ -801,6 +801,9 @@ struct task_struct {
    /* Stalled due to lack of memory */
    unsigned in_memstall:1;
    #endif
    +#ifdef CONFIG_IOMMU_SUPPORT
    + unsigned has_valid_pasid:1;
    +#endif

    unsigned long atomic_flags; /* Flags requiring atomic access. */

    diff --git a/kernel/fork.c b/kernel/fork.c
    index 43b5f112604d..0a962bebdf88 100644
    --- a/kernel/fork.c
    +++ b/kernel/fork.c
    @@ -955,6 +955,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
    tsk->use_memdelay = 0;
    #endif

    +#ifdef CONFIG_IOMMU_SUPPORT
    + tsk->has_valid_pasid = 0;
    +#endif
    +
    #ifdef CONFIG_MEMCG
    tsk->active_memcg = NULL;
    #endif
    --
    2.19.1
    \
     
     \ /
      Last update: 2020-06-17 20:27    [W:8.638 / U:0.020 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site