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| author |  Linus Torvalds <torvalds@linux-foundation.org>
| 2021-09-08 16:28:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org>
| 2021-09-08 16:28:14 -0700 |
| commit | 0f4b9289bad354b606190a4cd54d5222b4e41d98 (patch) | |
| tree | 15bdca31af36634b20ac950d7a1aefca3d572902 /Documentation/kernel-hacking/locking.rst | |
| parent | Merge tag 'modules-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
| parent | docs: pdfdocs: Fix typo in CJK-language specific font settings (diff) | |
| download | linux-0f4b9289bad354b606190a4cd54d5222b4e41d98.tar.gz linux-0f4b9289bad354b606190a4cd54d5222b4e41d98.tar.bz2 linux-0f4b9289bad354b606190a4cd54d5222b4e41d98.zip | |
Merge tag 'docs-5.15-2' of git://git.lwn.net/linux
Pull more documentation updates from Jonathan Corbet:
"Another collection of documentation patches, mostly fixes but also
includes another set of traditional Chinese translations"
* tag 'docs-5.15-2' of git://git.lwn.net/linux:
docs: pdfdocs: Fix typo in CJK-language specific font settings
docs: kernel-hacking: Remove inappropriate text
docs/zh_TW: add translations for zh_TW/filesystems
docs/zh_TW: add translations for zh_TW/cpu-freq
docs/zh_TW: add translations for zh_TW/arm64
docs/zh_CN: Modify the translator tag and fix the wrong word
Documentation/features/vm: correct huge-vmap APIs
Documentation: block: blk-mq: Fix small typo in multi-queue docs
Documentation: in_irq() cleanup
Documentation: arm: marvell: Add 88F6825 model into list
Documentation/process/maintainer-pgp-guide: Replace broken link to PGP path finder
Documentation: locking: fix references
Documentation: Update details of The Linux Kernel Module Programming Guide
docs: x86: Remove obsolete information about x86_64 vmalloc() faulting
Documentation/process/applying-patches: Activate linux-next man hyperlink
Diffstat (limited to 'Documentation/kernel-hacking/locking.rst')
| -rw-r--r-- | Documentation/kernel-hacking/locking.rst | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/Documentation/kernel-hacking/locking.rst b/Documentation/kernel-hacking/locking.rst index ed1284c6f078..90bc3f51eda9 100644 --- a/Documentation/kernel-hacking/locking.rst +++ b/Documentation/kernel-hacking/locking.rst @@ -94,16 +94,10 @@ primitives, but I'll pretend they don't exist. Locking in the Linux Kernel =========================== -If I could give you one piece of advice: never sleep with anyone crazier -than yourself. But if I had to give you advice on locking: **keep it -simple**. +If I could give you one piece of advice on locking: **keep it simple**. Be reluctant to introduce new locks. -Strangely enough, this last one is the exact reverse of my advice when -you **have** slept with someone crazier than yourself. And you should -think about getting a big dog. - Two Main Types of Kernel Locks: Spinlocks and Mutexes ----------------------------------------------------- @@ -1406,7 +1400,7 @@ bh half will be running at any time. Hardware Interrupt / Hardware IRQ - Hardware interrupt request. in_irq() returns true in a + Hardware interrupt request. in_hardirq() returns true in a hardware interrupt handler. Interrupt Context @@ -1418,7 +1412,7 @@ SMP (``CONFIG_SMP=y``). Software Interrupt / softirq - Software interrupt handler. in_irq() returns false; + Software interrupt handler. in_hardirq() returns false; in_softirq() returns true. Tasklets and softirqs both fall into the category of 'software interrupts'. |