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Sabrina Dubroca
747b67088f
While testing ipcomp on a realtime kernel, Xiumei reported a "sleeping in atomic" bug, caused by a memory allocation while preemption is disabled (ipcomp_decompress -> alloc_page -> ... get_page_from_freelist). As Sebastian noted [1], this get_cpu() isn't actually needed, since ipcomp_decompress() is called in napi context anyway, so BH is already disabled. This patch replaces get_cpu + per_cpu_ptr with this_cpu_ptr, then simplifies the error returns, since there isn't any common operation left. [1] https://lore.kernel.org/lkml/[email protected]/ Cc: Juri Lelli <[email protected]> Reported-by: Xiumei Mu <[email protected]> Suggested-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Sabrina Dubroca <[email protected]> Signed-off-by: Steffen Klassert <[email protected]>