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brick_mem: alias GFP_BRICK to __GFP_NORETRY when appropriate

This commit is contained in:
Thomas Schoebel-Theuer 2022-06-28 21:35:12 +02:00
parent 48a19e58d1
commit 79c611cf5d
1 changed files with 18 additions and 1 deletions
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19
kernel/brick_mem.h
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@ -46,8 +46,25 @@
#define BRICK_DEBUG_ORDER0
#endif
#if defined(__GFP_NORETRY) && \
defined(__GFP_KSWAPD_RECLAIM) && \
defined(__GFP_RECLAIM)
#if !defined(__GFP_COLD) /* see upstream 453f85d43fa9 after v4.14 */
#define GFP_BRICK \
((GFP_NOIO & \
~__GFP_KSWAPD_RECLAIM & \
~__GFP_RECLAIM & \
~0x0u) | \
__GFP_NORETRY | \
0x0u)
#else
#define GFP_BRICK GFP_NOIO /* otherwise people may get alarmed by massses of stacktraces */
#endif
#else
/* very old kernels */
#warning Using outdated GFP_NOIO because your kernel does not reliably support OOM mitigation via __GFP_NORETRY and co
#define GFP_BRICK GFP_NOIO
//#define GFP_BRICK GFP_KERNEL // can lead to deadlocks!
#endif
extern long long brick_global_memavail;
extern long long brick_global_memlimit;