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Bart Van Assche 8d146ecf5c locking: Fix rwlock support in <linux/spinlock_up.h> 
[ Upstream commit 756a0e011c ]

Architecture support for rwlocks must be available whether or not
CONFIG_DEBUG_SPINLOCK has been defined. Move the definitions of the
arch_{read,write}_{lock,trylock,unlock}() macros such that these become
visbile if CONFIG_DEBUG_SPINLOCK=n.

This patch prepares for converting do_raw_{read,write}_trylock() into
inline functions. Without this patch that conversion triggers a build
failure for UP architectures, e.g. arm-ep93xx. I used the following
kernel configuration to build the kernel for that architecture:

	CONFIG_ARCH_MULTIPLATFORM=y
	CONFIG_ARCH_MULTI_V7=n
	CONFIG_ATAGS=y
	CONFIG_MMU=y
	CONFIG_ARCH_MULTI_V4T=y
	CONFIG_CPU_LITTLE_ENDIAN=y
	CONFIG_ARCH_EP93XX=y

Fixes: fb1c8f93d8 ("[PATCH] spinlock consolidation")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260313171510.230998-2-bvanassche@acm.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-06-01 17:35:27 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.