diff options
| author | Li RongQing <lirongqing@baidu.com> | 2026-06-04 19:03:18 +0800 |
|---|---|---|
| committer | Vlastimil Babka (SUSE) <vbabka@kernel.org> | 2026-07-08 18:31:27 +0200 |
| commit | a561e19e76ef1ebf3f9a56977dfe87526b37146c (patch) | |
| tree | dfaa35093c71dc4e4d662c358f1c44244770b4da /Documentation/admin-guide | |
| parent | 29b3b6cde5f2dee1c51a1c03ba2e0015e205125b (diff) | |
| download | linux-a561e19e76ef1ebf3f9a56977dfe87526b37146c.tar.gz linux-a561e19e76ef1ebf3f9a56977dfe87526b37146c.zip | |
mm/mempool: Untangle CONFIG_SLUB_DEBUG_ON abuse and switch to static key
The mempool subsystem historically wrapped its debugging logic inside an
merely defines compile-time defaults for SLUB and caused two flaws:
1. On production kernels where CONFIG_SLUB_DEBUG=y but
CONFIG_SLUB_DEBUG_ON=n, mempool debugging was completely compiled out
at compile time.
2. On kernels with CONFIG_SLUB_DEBUG_ON=y, mempool debugging stayed active
even if a user explicitly disabled slub debugging at boot time.
Clean up this mess by removing the #ifdef and switching to a runtime static
key (mempool_debug_enabled), allowing mempool debugging to be toggled
cleanly via its own boot parameter.
Suggested-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Harry Yoo <harry@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Hao Li <hao.li@linux.dev>
Cc: Christoph Lameter <cl@gentwo.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Usama Arif <usama.arif@linux.dev>
Reviewed-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Harry Yoo (Oracle) <harry@kernel.org>
Link: https://patch.msgid.link/20260604110318.2089-1-lirongqing@baidu.com
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b5493a7f8f22..ca755fe185e5 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3977,6 +3977,11 @@ Kernel parameters Note that even when enabled, there are a few cases where the feature is not effective. + mempool_debug [MM] + Enable mempool debugging. This enables element + poison checking when freeing elements back to the + pool. Useful for debugging mempool corruption. + memtest= [KNL,X86,ARM,M68K,PPC,RISCV,EARLY] Enable memtest Format: <integer> default : 0 <disable> |