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MDEV-24125: allow compile on Linux headers < 3.8

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This allows MariaDB to compile on old (limits to >2.6.32)
linux kernel versions.

This warns that attempts to use large pages will rely on
implict kernel determination.
This commit is contained in:
Daniel Black 2020-11-16 09:23:51 +11:00
parent 8cc5d2845c
commit 7f30a5c423
1 changed files with 7 additions and 3 deletions
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10
mysys/my_largepage.c
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@ -325,9 +325,13 @@ uchar *my_large_malloc(size_t *size, myf my_flags)
/* this might be 0, in which case we do a standard mmap */
if (large_page_size)
{
#ifdef __linux__
mapflag|= MAP_HUGETLB |
my_bit_log2_size_t(large_page_size) << MAP_HUGE_SHIFT;
#if defined(MAP_HUGETLB) /* linux 2.6.32 */
mapflag|= MAP_HUGETLB;
#if defined(MAP_HUGE_SHIFT) /* Linux-3.8+ */
mapflag|= my_bit_log2_size_t(large_page_size) << MAP_HUGE_SHIFT;
#else
# warning "No explicit large page (HUGETLB pages) support in Linux < 3.8"
#endif
#elif defined(MAP_ALIGNED)
mapflag|= MAP_ALIGNED_SUPER |
MAP_ALIGNED(my_bit_log2_size_t(large_page_size));