1IDR_PRELOAD(9)          Basic Kernel Library Functions          IDR_PRELOAD(9)
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NAME

6       idr_preload - preload for idr_alloc
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SYNOPSIS

9       void idr_preload(gfp_t gfp_mask);
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ARGUMENTS

12       gfp_mask
13           allocation mask to use for preloading
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DESCRIPTION

16       Preload per-cpu layer buffer for idr_alloc. Can only be used from
17       process context and each idr_preload invocation should be matched with
18       idr_preload_end. Note that preemption is disabled while preloaded.
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20       The first idr_alloc in the preloaded section can be treated as if it
21       were invoked with gfp_mask used for preloading. This allows using more
22       permissive allocation masks for idrs protected by spinlocks.
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24       For example, if idr_alloc below fails, the failure can be treated as if
25       idr_alloc were called with GFP_KERNEL rather than GFP_NOWAIT.
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27       idr_preload(GFP_KERNEL); spin_lock(lock);
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29       id = idr_alloc(idr, ptr, start, end, GFP_NOWAIT);
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31       spin_unlock(lock); idr_preload_end; if (id < 0) error;
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34Kernel Hackers Manual 3.10         June 2019                    IDR_PRELOAD(9)
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