docs: proc: remove description of prof_cpu_mask

Commit 2e5449f4f21a ("profiling: Remove create_prof_cpu_mask().") said that
no one would create /proc/irq/prof_cpu_mask since commit 1f44a225777e
("s390: convert interrupt handling to use generic hardirq", 2013). Remove
the outdated description.

While at it, fix another minor typo (s/DMS/DMA/).

Signed-off-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260311070940.94838-1-zenghui.yu@linux.dev>

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index e2d22a424dcdebb72f898a0c6d62f98b0cca2971..873761087f8dc4a906555964ca196e7e78edd739 100644 (file)
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -743,7 +743,7 @@ files are there, and which are missing.
               in the kernel image
  cpuinfo      Info about the CPU
  devices      Available devices (block and character)
- dma          Used DMS channels
+ dma          Used DMA channels
  filesystems  Supported filesystems
  driver       Various drivers grouped here, currently rtc      (2.4)
  execdomains  Execdomains, related to security                 (2.4)
@@ -877,14 +877,13 @@ i386 and x86_64 platforms support the new IRQ vector displays.
 Of some interest is the introduction of the /proc/irq directory to 2.4.
 It could be used to set IRQ to CPU affinity. This means that you can "hook" an
 IRQ to only one CPU, or to exclude a CPU of handling IRQs. The contents of the
-irq subdir is one subdir for each IRQ, and two files; default_smp_affinity and
-prof_cpu_mask.
+irq subdir is one subdir for each IRQ, and default_smp_affinity.
 
 For example::
 
   > ls /proc/irq/
-  0  10  12  14  16  18  2  4  6  8  prof_cpu_mask
-  1  11  13  15  17  19  3  5  7  9  default_smp_affinity
+  0  10  12  14  16  18  2  4  6  8  default_smp_affinity
+  1  11  13  15  17  19  3  5  7  9
   > ls /proc/irq/0/
   smp_affinity
 
@@ -915,9 +914,6 @@ The node file on an SMP system shows the node to which the device using the IRQ
 reports itself as being attached. This hardware locality information does not
 include information about any possible driver locality preference.
 
-prof_cpu_mask specifies which CPUs are to be profiled by the system wide
-profiler. Default value is ffffffff (all CPUs if there are only 32 of them).
-
 The way IRQs are routed is handled by the IO-APIC, and it's Round Robin
 between all the CPUs which are allowed to handle it. As usual the kernel has
 more info than you and does a better job than you, so the defaults are the