The kernel panics because in the flags variable, I have other flagsWhich flags were set? __GFP_WAIT must not be set [i.e. will panic], the other combinations are invalid. The only legal values for the flags variable are 0 or SLAB_ATOMIC [aka GFP_ATOMIC, aka __GFP_HIGH].
(0x1f0) besides SLAB_ATOMIC.
I modified it to:No, it's wrong. Your driver will panic once in a while, especially under memory intensive stress tests.
if (in_interrupt() && (flags & SLAB_ATOMIC) != SLAB_ATOMIC)
BUG();
It seems working fine.
Is this good?