On 9/23/2021 5:28 AM, Greg KH wrote:

On Mon, Sep 13, 2021 at 01:01:29PM -0700, Sohil Mehta wrote:

quoted

+/* 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.

quoted

+	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.

quoted

+	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?

quoted

+} __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