x86/irq/32: Handle irq stack allocation failure proper

irq_ctx_init() crashes hard on page allocation failures. While that's ok
during early boot, it's just wrong in the CPU hotplug bringup code.

Check the page allocation failure and return -ENOMEM and handle it at the
call sites. On early boot the only way out is to BUG(), but on CPU hotplug
there is no reason to crash, so just abort the operation.

Rename the function to something more sensible while at it.

Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Alison Schofield <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Nicolai Stange <[email protected]>
Cc: Pu Wen <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Shaokun Zhang <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: Suravee Suthikulpanit <[email protected]>
Cc: x86-ml <[email protected]>
Cc: [email protected]
Cc: Yazen Ghannam <[email protected]>
Cc: Yi Wang <[email protected]>
Cc: Zhenzhong Duan <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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