x86/hyperv: remove on-stack cpumask from hv_send_ipi_mask_allbutself
It is not a good practice to allocate a cpumask on stack, given it may consume up to 1 kilobytes of stack space if the kernel is configured to have 8192 cpus. The internal helper functions __send_ipi_mask{,_ex} need to loop over the provided mask anyway, so it is not too difficult to skip `self' there. We can thus do away with the on-stack cpumask in hv_send_ipi_mask_allbutself. Adjust call sites of __send_ipi_mask as needed. Reported-by:Linus Torvalds <torvalds@linux-foundation.org> Suggested-by:
Michael Kelley <mikelley@microsoft.com> Suggested-by:
Linus Torvalds <torvalds@linux-foundation.org> Fixes: 68bb7bfb ("X86/Hyper-V: Enable IPI enlightenments") Signed-off-by:
Wei Liu <wei.liu@kernel.org> Reviewed-by:
Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/20210910185714.299411-3-wei.liu@kernel.org
parent
7ad9bb9d
Please register or sign in to comment