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From: glider@google.com
To: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>,
	Petr Mladek <pmladek@suse.com>,
	 Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	 Dmitry Vyukov <dvyukov@google.com>,
	linux-mm@kvack.org
Subject: [PATCH RFC v1 05/26] printk_safe: externalize printk_context
Date: Fri, 18 Oct 2019 11:42:43 +0200	[thread overview]
Message-ID: <20191018094304.37056-6-glider@google.com> (raw)
In-Reply-To: <20191018094304.37056-1-glider@google.com>

Petr Mladek suggested we use
  this_cpu_read(printk_context) & PRINTK_SAFE_CONTEXT_MASK
instead of checking the spinlock status in kmsan_pr_err()

This appears to be less intrusive, although we'll need to declare
printk_context in some printk header.

Signed-off-by: Alexander Potapenko <glider@google.com>
To: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: linux-mm@kvack.org
---

Change-Id: Idb5e7c7cedf6ab6ba635a64423d58d702ad3eca3
---
 kernel/printk/printk_safe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/printk/printk_safe.c b/kernel/printk/printk_safe.c
index b4045e782743..5ebfc8bc5693 100644
--- a/kernel/printk/printk_safe.c
+++ b/kernel/printk/printk_safe.c
@@ -42,7 +42,7 @@ struct printk_safe_seq_buf {
 };
 
 static DEFINE_PER_CPU(struct printk_safe_seq_buf, safe_print_seq);
-static DEFINE_PER_CPU(int, printk_context);
+DEFINE_PER_CPU(int, printk_context);
 
 #ifdef CONFIG_PRINTK_NMI
 static DEFINE_PER_CPU(struct printk_safe_seq_buf, nmi_print_seq);
-- 
2.23.0.866.gb869b98d4c-goog



  parent reply	other threads:[~2019-10-18  9:43 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-18  9:42 [PATCH RFC v1 00/26] Add KernelMemorySanitizer infrastructure glider
2019-10-18  9:42 ` [PATCH RFC v1 01/26] stackdepot: check depot_index before accessing the stack slab glider
2019-10-18  9:42 ` [PATCH RFC v1 02/26] stackdepot: prevent Clang from optimizing away stackdepot_memcmp() glider
2019-10-18  9:42 ` [PATCH RFC v1 03/26] kasan: stackdepot: move filter_irq_stacks() to stackdepot.c glider
2019-10-18  9:42 ` [PATCH RFC v1 04/26] stackdepot: reserve 5 extra bits in depot_stack_handle_t glider
2019-10-18  9:42 ` glider [this message]
2019-10-21  9:09   ` [PATCH RFC v1 05/26] printk_safe: externalize printk_context Petr Mladek
2019-10-23 17:57     ` Alexander Potapenko
2019-10-23 18:00       ` Alexander Potapenko
2019-10-24 12:46       ` Petr Mladek
2019-10-28 13:09         ` Alexander Potapenko
2019-10-29 12:02           ` Petr Mladek
2019-10-29 12:45             ` Alexander Potapenko
2019-10-18  9:42 ` [PATCH RFC v1 06/26] kasan: compiler.h: rename __no_kasan_or_inline into __no_memory_tool_or_inline glider
2019-10-18  9:42 ` [PATCH RFC v1 07/26] kmsan: add ReST documentation glider
2019-10-18  9:42 ` [PATCH RFC v1 08/26] kmsan: gfp: introduce __GFP_NO_KMSAN_SHADOW glider
2019-10-18  9:42 ` [PATCH RFC v1 09/26] kmsan: introduce __no_sanitize_memory and __SANITIZE_MEMORY__ glider
2019-10-18  9:42 ` [PATCH RFC v1 10/26] kmsan: reduce vmalloc space glider
2019-10-18  9:42 ` [PATCH RFC v1 11/26] kmsan: add KMSAN runtime glider
2019-10-18  9:42 ` [PATCH RFC v1 12/26] kmsan: x86: sync metadata pages on page fault glider
2019-10-18  9:42 ` [PATCH RFC v1 13/26] kmsan: add tests for KMSAN glider
2019-10-18  9:42 ` [PATCH RFC v1 14/26] kmsan: make READ_ONCE_TASK_STACK() return initialized values glider
2019-10-18  9:42 ` [PATCH RFC v1 15/26] kmsan: Kconfig changes to disable options incompatible with KMSAN glider
2019-10-21 14:11   ` Harry Wentland
2019-10-18  9:42 ` [PATCH RFC v1 16/26] kmsan: Changing existing files to enable KMSAN builds glider
2019-10-18  9:42 ` [PATCH RFC v1 17/26] kmsan: disable KMSAN instrumentation for certain kernel parts glider
2019-10-18  9:42 ` [PATCH RFC v1 18/26] kmsan: mm: call KMSAN hooks from SLUB code glider
2019-10-18 13:22   ` Qian Cai
2019-10-18 13:33     ` Alexander Potapenko
2019-10-18 13:41       ` Qian Cai
2019-10-18 13:55         ` Alexander Potapenko
2019-10-18 14:42           ` Qian Cai
2019-10-18 14:54             ` Alexander Potapenko
2019-10-18 15:13               ` Qian Cai
2019-10-18 15:30                 ` Alexander Potapenko
2019-10-18 16:08                   ` Qian Cai
2019-10-18  9:42 ` [PATCH RFC v1 19/26] kmsan: call KMSAN hooks where needed glider
2019-10-18 15:02   ` Qian Cai
2019-10-29 14:09     ` Alexander Potapenko
2019-10-29 14:56       ` Qian Cai
2019-10-21  9:25   ` Petr Mladek
2019-10-29 13:59     ` Alexander Potapenko
2019-10-18  9:42 ` [PATCH RFC v1 20/26] kmsan: disable instrumentation of certain functions glider
2019-10-18  9:42 ` [PATCH RFC v1 21/26] kmsan: unpoison |tlb| in arch_tlb_gather_mmu() glider
2019-10-18  9:43 ` [PATCH RFC v1 22/26] kmsan: use __msan_memcpy() where possible glider
2019-10-18  9:43 ` [PATCH RFC v1 23/26] kmsan: unpoisoning buffers from devices etc glider
2019-10-18 15:27   ` Christoph Hellwig
2019-10-18 16:22   ` Matthew Wilcox
2019-10-29 14:45     ` Alexander Potapenko
2019-10-30 12:43       ` Alexander Potapenko
2019-10-18  9:43 ` [PATCH RFC v1 24/26] kmsan: hooks for copy_to_user() and friends glider
2019-10-18  9:43 ` [PATCH RFC v1 25/26] kmsan: disable strscpy() optimization under KMSAN glider
2019-10-18  9:43 ` [PATCH RFC v1 26/26] net: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN glider
2019-10-19  3:20   ` Randy Dunlap

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