Nicholas Piggin 2babd6ea43 powerpc/64s/exception: Avoid touching the stack in hdecrementer ... The hdec interrupt handler is reported to sometimes fire in Linux if KVM leaves it pending after a guest exists. This is harmless, so there is a no-op handler for it. The interrupt handler currently uses the regular kernel stack. Change this to avoid touching the stack entirely. This should be the last place where the regular Linux stack can be accessed with asynchronous interrupts (including PMI) soft-masked. It might be possible to take advantage of this invariant, e.g., to context switch the kernel stack SLB entry without clearing MSR[EE]. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200225173541.1549955-17-npiggin@gmail.com		2020-04-01 13:42:12 +11:00
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asm	powerpc/64s/exception: Avoid touching the stack in hdecrementer	2020-04-01 13:42:12 +11:00
uapi/asm	arch: sembuf.h: make uapi asm/sembuf.h self-contained	2019-12-04 19:44:14 -08:00