master f113d0c: Some Tramp doc clarifications

[Michael Albinus]

branch: master
commit f113d0c4fdb100ce72ce88b5c8affe497037a5fa
Author: Michael Albinus <michael.albinus@gmx.de>
Commit: Michael Albinus <michael.albinus@gmx.de>

    Some Tramp doc clarifications
    
    * doc/misc/tramp.texi (Remote shell setup): Explain meaning of
    `tramp-sh-extra-args' for bash.
    (Frequently Asked Questions): New item about unloading / reloading Tramp.
---
 doc/misc/tramp.texi | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/doc/misc/tramp.texi b/doc/misc/tramp.texi
index 7ae5622..5ea0275 100644
--- a/doc/misc/tramp.texi
+++ b/doc/misc/tramp.texi
@@ -2305,6 +2305,8 @@ which support this.
 This approach has also the advantage, that settings in
 @code{tramp-sh-extra-args} will be applied.  For @command{zsh}, the
 trouble with the shell prompt due to set zle options will be avoided.
+For @command{bash}, loading @file{~/.editrc} or @file{~/.inputrc} is
+suppressed.
 
 Similar problems can happen with the local shell Tramp uses to create
 a process.  By default, it uses the command @command{/bin/sh} for
@@ -5077,6 +5079,24 @@ In case you have installed it from its Git repository, 
@ref{Recompilation}.
 
 
 @item
+I get an error @samp{tramp-file-name-handler: Invalid function:
+tramp-compat-with-mutex}
+
+Likely, you have a running Emacs session with loaded @value{tramp},
+and you try to upgrade it to another version from GNU ELPA.  Since
+@value{tramp} is not forward compatible, you must unload / reload it.
+Try the following steps:
+
+@example
+@kbd{M-x tramp-unload-tramp @key{RET}}
+@kbd{M-x load-library @key{RET} tramp @key{RET}}
+@end example
+
+If this doesn't work, you must restart Emacs with proper
+@code{load-path} for the new @value{tramp} version.
+
+
+@item
 I get an error @samp{Remote file error: Forbidden reentrant call of Tramp}
 
 @vindex remote-file-error