cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

memcat_p.c (753B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/slab.h>
      4
      5/*
      6 * Merge two NULL-terminated pointer arrays into a newly allocated
      7 * array, which is also NULL-terminated. Nomenclature is inspired by
      8 * memset_p() and memcat() found elsewhere in the kernel source tree.
      9 */
     10void **__memcat_p(void **a, void **b)
     11{
     12	void **p = a, **new;
     13	int nr;
     14
     15	/* count the elements in both arrays */
     16	for (nr = 0, p = a; *p; nr++, p++)
     17		;
     18	for (p = b; *p; nr++, p++)
     19		;
     20	/* one for the NULL-terminator */
     21	nr++;
     22
     23	new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL);
     24	if (!new)
     25		return NULL;
     26
     27	/* nr -> last index; p points to NULL in b[] */
     28	for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1)
     29		new[nr] = *p;
     30
     31	return new;
     32}
     33EXPORT_SYMBOL_GPL(__memcat_p);
     34