On 9/23/2021 5:28 AM, Greg KH wrote:
On Mon, Sep 13, 2021 at 01:01:29PM -0700, Sohil Mehta wrote:
+/* User Interrupt Target Table Entry (UITTE) */
+struct uintr_uitt_entry {
+ u8 valid; /* bit 0: valid, bit 1-7: reserved */
Do you check that the other bits are set to 0?
I don't have a check but kzalloc() in alloc_uitt() should set it to 0.
+ u8 user_vec;
+ u8 reserved[6];
What is this reserved for?
This is hardware defined structure as well. I should probably mention
this it in the comment above.
+ u64 target_upid_addr;
If this is a pointer, why not say it is a pointer?
I used a u64 to get the size and alignment of this structure as required
by the hardware. I wasn't sure if using a struct upid * would complicate
that.
Also this field is never used as a pointer by the kernel. It is only
used to program an entry that is read by the hardware.
Is this reasonable or would you still prefer a pointer?
+} __packed __aligned(16);
+
+struct uintr_uitt_ctx {
+ struct uintr_uitt_entry *uitt;
+ /* Protect UITT */
+ spinlock_t uitt_lock;
+ refcount_t refs;
Again, a kref please.
Will do.
Thanks,
Sohil
